gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Question: Process for Enhancement Request

[Ethan A M. <eam...@gm...>]

On Saturday, 23 November 2019 10:59:10 John L. Males wrote:
> Hello,
> 
> I would like to suggest an enhancement request for GnuPlot.
> What is the process for suggesting an enhancement?

Feature Requests:
  https://sourceforge.net/p/gnuplot/feature-requests/


> Secondary question is which is the preferred venue for posting
> messages <news://comp.graphics.apps.gnuplot> or
> <http://lists.sourceforge.net/lists/listinfo/gnuplot-info>

usenet seems to be in its dotage, so messages to the newsgroup
are not seen by many eyes.  For questions or help requests I
suggest either gnuplot-info or
  https://stackoverflow.com/questions/tagged/gnuplot

		Ethan

-- 
entia non sunt multiplicanda praeter necessitatem

[Gnuplot-info] Question: Process for Enhancement Request

[John L. M. <jl...@gm...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello,

I would like to suggest an enhancement request for GnuPlot.
What is the process for suggesting an enhancement?

Secondary question is which is the preferred venue for posting
messages <news://comp.graphics.apps.gnuplot> or
<http://lists.sourceforge.net/lists/listinfo/gnuplot-info>


John L. Males
Toronto, Ontario
Canada
23 November 2019 05:59 -0500 EST


================================================================

2019-11-23 10:43:29+0000-UTC Time: 1574505809 PC/System time

23 Nov 10:43:29 ntpdate[51620]: ntpdate 4.2.8p12-a (1)

23 Nov 10:43:43 ntpdate[51949]: step time server 206.108.0.131
offset 0.000442 sec

FreeBSD 11.3-STABLE FreeBSD 11.3-STABLE #0 r349903: Thu Jul 11
16:13:47 UTC 2019
ro...@re...:/usr/obj/usr/src/sys/GENERIC 

(Work in progress alternative to Linux Kernel of its own right,
 Debian, and
 other Linux based Kernel distributions determined.)

Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz
Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz (1396.86-MHz K8-class
CPU) Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz (1396.86-MHz
K8-class CPU) Intel(R) Core(TM) i3-2367M CPU @ 1.40GHz
(1396.86-MHz K8-class CPU) Intel(R) Core(TM) i3-2367M CPU @
1.40GHz (1396.86-MHz K8-class CPU) Intel(R) Core(TM) i3-2367M
CPU @ 1.40GHz (1396.86-MHz K8-class CPU)

dev.cpu.0.temperature: 73.0C
dev.cpu.1.temperature: 73.0C
dev.cpu.2.temperature: 70.0C
dev.cpu.3.temperature: 70.0C
hw.acpi.thermal.tz0.temperature: 73.1C

vmstat -s:

3463183541 cpu context switches
116563160 device interrupts
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693848504 traps
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       27 kernel threads created
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710451609 total VM faults taken
   297371 page faults requiring I/O
        0 pages affected by kernel thread creation
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656018678 pages freed
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273926362 total name lookups
          cache hits (95% pos + 0% neg) system 0% per-directory
          deletions 0%, falsehits 0%, toolong 0%

Boot time : 1573956255

procs     memory        page                    disks
faults        cpu0     cpu1     cpu2     cpu3 r b w     avm
fre  flt  re  pi  po    fr   sr ad0 pa0   in    sy    cs us sy
id us sy id us sy id us sy id 1 0 0 35980780  320240 1293  59
0   0  1194 1165   0   0  212  7342  6302 16  6 79 17  4 79 17
4 79 17  4 79

memory info:

real memory  = 8589934592 (8192 MB)
avail memory = 8166465536 (7788 MB)

last pid: 54181;  load averages:  1.21,  1.32,  1.16  up
6+08:39:29    10:43:44 70 processes:  1 running, 69 sleeping

Mem: 1665M Active, 2699M Inact, 1589M Laundry, 1578M Wired,
733M Buf, 312M Free Swap: 48G Total, 2323M Used, 46G Free, 4%
Inuse

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hw.usermem: 6809346048
hw.realmem: 8589934592

             total       used       free     shared
buffers     cached Mem:       8030732    4946656
3084076          0          0          0 Swap:     50331644
2379144   47952500

swapinfo:

Device          1K-blocks     Used    Avail Capacity
/dev/ada0s1b     50331644  2379144 47952500     5%

vmstat:

procs     memory        page                    disks
faults         cpu r b w     avm     fre  flt  re  pi  po
fr   sr ad0 pa0   in    sy    cs us sy id 0 0 0 35980780
319924 1293  59   0   0  1194 1165   0   0  212  7342  6302 17
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[Gnuplot-info] gnuplot matrix pixel sizes

[Patrick A. <al...@co...>]

Hello,

  I posted to stackexchange to ask a question about plotting large
matrices and improving the visualizations. The post contains images
illustrating my question, and I'd much appreciate if experienced users
could have a look and make any suggestions. The post is here:

https://stackoverflow.com/questions/58496687/gnuplot-matrix-increased-pixel-size

Thanks,

Patrick

[Gnuplot-info] PICT2E_linewidth method definition

[Kleber T. <kle...@ya...>]

Hello everyone,
I would like to understand a little more about the Gnuplot code. Specifically, I would like to know why there is no definition of the PICT2E_linewidth method in the pict2e.trm file.
#ifdef TERM_PROTO (line 62)Why is there no definition of the PICT2E_linewidth method here?#endif (line 104)
Isn't that weird? I'm just curious, thanks.

Re: [Gnuplot-info] Gnuplot ignoring missing data (fwd)

[Tait <gnu...@t4...>]

I think you misunderstand what "set datafile missing" does -- at
least in the current gnuplot version. To quote from "help set
datafile missing":

  Gnuplot makes a distinction between missing data and invalid
  data (e.g. "NaN", 1/0.). For example invalid data causes a gap
  in a line drawn through sequential data points; missing data
  does not.

The help also notes missing/invalid handling changed between v4
and v5, so StackOverflow's advice may have been correct at one
time.

(I don't know why nobody is replying... I certainly don't have
any special knowledge in this area.)


Dave Horsfall <da...@ho...> said (on 2019/09/16):
> Was my question too hard to answer, or merely mis-phrased?  I simply want 
> to know whether I have misunderstood the meaning of "set datafile missing" 
> or should I be reporting it as a Gnuplot bug?
> 
> I don't like reporting bugs if it turns out to be my fault...
> 
> -- Dave
> 
> ---------- Forwarded message ----------
> Odd; I just noticed that another of my graphs has a discontinuity at missing 
> data, yet I don't have the "set datafile missing 'x'" line, so what on earth 
> could be wrong?  What have I not understood about missing data?
> 
> Taking that directive out of spamlog.gp indeed shows a discontinuity (see 
> www.horsfall.org/spamlog-1.pdf) so something is definitely fishy here...
> 
> -- Dave
> 
> ---------- Forwarded message ----------
> Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.
> 
> Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
> there is missing data there thanks to my ISP cutting my fibre and taking ages 
> to fix it (great anti-spam measure, I suppose).
> 
> In my spamlog.gp, I have:
> 
>      set datafile    missing "x"
>      ...
>      plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
>      ...
> 
> Sample line from spamlog.dat:
> 
>      2019/04/26      x x x x x x x x x
>      (Actually tabs, not spaces)
> 
> Have I misunderstood what "missing" means?  It's been a while since I studied 
> stats...  My understanding is just that: missing data, hence leave a hole in 
> your graph (indistinguishable from zero in my case, but I can handle that).
> 
> A message on StackOverflow also says that the above should work and not draw a 
> line across it (not that I trust StackOverflow anyway), but that's exactly what 
> Gnuplot is doing.
> 
> Thanks.
> 
> -- Dave

Re: [Gnuplot-info] Gnuplot ignoring missing data (fwd)

[Dave H. <da...@ho...>]

Was my question too hard to answer, or merely mis-phrased?  I simply want 
to know whether I have misunderstood the meaning of "set datafile missing" 
or should I be reporting it as a Gnuplot bug?

I don't like reporting bugs if it turns out to be my fault...

-- Dave

---------- Forwarded message ----------
Date: Mon, 8 Jul 2019 07:33:24 +1000 (EST)
From: Dave Horsfall <da...@ho...>
To: Gnuplot Mailing List <gnu...@li...>
Subject: Re: Gnuplot ignoring missing data

Odd; I just noticed that another of my graphs has a discontinuity at missing 
data, yet I don't have the "set datafile missing 'x'" line, so what on earth 
could be wrong?  What have I not understood about missing data?

Taking that directive out of spamlog.gp indeed shows a discontinuity (see 
www.horsfall.org/spamlog-1.pdf) so something is definitely fishy here...

-- Dave

---------- Forwarded message ----------
Date: Sat, 6 Jul 2019 10:41:36 +1000 (EST)
From: Dave Horsfall <da...@ho...>
To: Gnuplot Mailing List <gnu...@li...>
Subject: Gnuplot ignoring missing data

Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.

Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
there is missing data there thanks to my ISP cutting my fibre and taking ages 
to fix it (great anti-spam measure, I suppose).

In my spamlog.gp, I have:

     set datafile    missing "x"
     ...
     plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
     ...

Sample line from spamlog.dat:

     2019/04/26      x x x x x x x x x
     (Actually tabs, not spaces)

Have I misunderstood what "missing" means?  It's been a while since I studied 
stats...  My understanding is just that: missing data, hence leave a hole in 
your graph (indistinguishable from zero in my case, but I can handle that).

A message on StackOverflow also says that the above should work and not draw a 
line across it (not that I trust StackOverflow anyway), but that's exactly what 
Gnuplot is doing.

Thanks.

-- Dave

Re: [Gnuplot-info] xrange with variable t

[Hans-Bernhard B. <HBB...@t-...>]

Am 21.08.2019 um 14:04 schrieb Pradana Aumars via gnuplot-info:
> Hello everyone,
> 
> I'm looking for a way to create a plot with xrange's upper bound as a variable, like t. Something like this:

"this:" did not make it to the mailing list...

As to the question, it appears you may be searching for

	help gnuplot-defined variables

[Gnuplot-info] xrange with variable t

[Pradana A. <pa...@pr...>]

Hello everyone,

I'm looking for a way to create a plot with xrange's upper bound as a variable, like t. Something like this:

Thank you.

Sent with [ProtonMail](https://protonmail.com) Secure Email.

[Gnuplot-info] Multiple labels in one axis

[JCA <1....@gm...>]

I am plotting some data from a file that is being added to all the time.
The file is reread by gnuplot every 60 seconds. The data are organized in
two columns: the left column is a timestamp, that will be used in the x
axis, whereas the second column is another meaning (whose meaning is not
relevant to this discussion) that will go in the y axis.

As things stand right now, I got gnuplot to draw a tic in the x axis every
86400 seconds (one day) worth of input data, with each tic labeled with the
name of the day of the week. I would like to enhance this by labeling every
Sunday with a additional text, corresponding to the week number from the
start of the year, and the beginning of a new month with the name of the
new month.

I think I would know how to get gnuplot to do those three chores separately
- but I don't know how to get them working together, in the same x axis for
the same, constantly updated, plot. Any pointers on how to do this with
gnuplot 5.* would be appreciated.

Re: [Gnuplot-info] subroutine

[Patrick D. <pd...@gm...>]

Hello Dan,

Thank for the response.
Can I also pass parameter to a subroutine?
Like a in in your example.

Thanks.

===========================================================================
 Patrick DUPRÉ                                 | | email: pd...@gm...
 Laboratoire interdisciplinaire Carnot de Bourgogne
 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
 Tel: +33 (0)380395988
===========================================================================


> Sent: Wednesday, July 31, 2019 at 6:16 PM
> From: "Dan" <vi5...@ya...>
> To: "Patrick Dupre" <pd...@gm...>
> Cc: gnuplot <gnu...@li...>
> Subject: Re: [Gnuplot-info] subroutine
>
> On Thu, 27 Jun 2019, Patrick Dupre wrote:
> 
> > Can I make a subroutine like
> > sub F () {
> > list of gnuplot calls ;
> > }
> 
> Yes.  In Gnuplot 5.0, you can define such a subroutine by, for example
> 
> mysub = "set terminal x11 1; plot x**a; set terminal x11 2; plot x**b"
> 
> then call that subroutine by
> 
> a = 2.0
> b = 3.0
> @mysub
> 
> -- 
> 
> Kind regards,
> 
> Dan
>

Re: [Gnuplot-info] subroutine

[Dan <vi5...@ya...>]

On Thu, 27 Jun 2019, Patrick Dupre wrote:

> Can I make a subroutine like
> sub F () {
> list of gnuplot calls ;
> }

Yes.  In Gnuplot 5.0, you can define such a subroutine by, for example

mysub = "set terminal x11 1; plot x**a; set terminal x11 2; plot x**b"

then call that subroutine by

a = 2.0
b = 3.0
@mysub

-- 

Kind regards,

Dan

Re: [Gnuplot-info] range of fitted variable

[Dan <vi5...@ya...>]

On Mon, 1 Jul 2019, Tatsuro MATSUOKA wrote:

> For sophisticated data analysis, please consider use other tools.
> Python +SciPy+NumPy+Matplotlib on Jupyter-Lab, GNU Octave, or
> Scilab.  gnuplot is a basically plotting tool and do not expect to
> use it for complicated cases.

Has no-one on the list jumped in to defend Gnuplot from this calumny?

While there are at least a dozen packages out there that can do
non-linear least squares fitting, there are only two that can take
into account the uncertainties in the measured values of the
independent variable(s) [by the Orear method].  Those two are Gnuplot
(version 5.0 or later) and Wolfram Experimental Data Analyst.

-- 

Kind regards,

Dan

Re: [Gnuplot-info] splot xyz zerr

[Dan <vi5...@ya...>]

On Sun, 28 Jul 2019, Patrick Dupre wrote:

> I used to use gnuplot for ploting and fitting y (x) function.
> I now need to plot and fit 2d functions.
> I cannot find the equivalent of
> splot 'file' u 1:2:3:4 w zerr
> and
> fit function (x,y) file u 1:2:3:4 w zerr
> and
> fit z=f(x,y) file u 1:2:3:4:5:6 w xyzerr
> Is it not possible?

I don't think the splot can be done, but the fits can (although the
second of the two fits needs Gnuplot version 5.0 or later): see pages
74-76 of <http://www.gnuplot.info/docs_5.2/Gnuplot_5.2.pdf>.

-- 

Kind regards,

Dan

[Gnuplot-info] splot xyz zerr

[Patrick D. <pd...@gm...>]

Hello,

I used to use gnuplot for ploting and fitting y (x) function.
I now need to plot and fit 2d functions.
I cannot find the equivalent of 
splot 'file' u 1:2:3:4 w zerr
and
fit function (x,y) file u 1:2:3:4 w zerr
and
fit z=f(x,y) file u 1:2:3:4:5:6 w xyzerr

Is it not possible?

Thank for your help.

===========================================================================
 Patrick DUPRÉ                                 | | email: pd...@gm...
 Laboratoire interdisciplinaire Carnot de Bourgogne
 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
 Tel: +33 (0)380395988
===========================================================================

Re: [Gnuplot-info] Labelled major and unlabelled minor axis tics

[Hans-Bernhard B. <HBB...@t-...>]

Am 25.07.2019 um 22:23 schrieb Reginald Beardsley via gnuplot-info:
> I want to have major tics which are labelled and minor tics which are not.

There's not really anything you should have to do to get that effect, as
it's the default already.  All you have to do is actually turn onn minor
tics:

	set mxtics


> gnuplot> set xtics scale 10 1

That does not do at all what you appear to intend.

> Note that I did *not* get a minor tic interval of 1, but of 5.

You did not get any minor tic interval at all, because you didnt's turn
on minor tics.

You requested a major tic _scale_ of 10 (which is the length of the tick
marks), and because you didn't specify otherwise, the minor tic scale
changed to match it.  If you had really wanted the minor tic length a 1,
that should have read

	set xtics scale 10,1

As-is the '1' becomes the x tic interval instead.  Note how it changed
from "intervals computed automatically" to "series by 1".

[Gnuplot-info] Labelled major and unlabelled minor axis tics

[Reginald B. <pul...@ya...>]

I want to have major tics which are labelled and minor tics which are not.

For some reason I seem not to be able to do that.  I've gone through all the demos that came with 4.4.3 and 4.6.5,  but none showed how to do that.  logscale produces the desired result, but I don't want a logarithmic scale. 


        G N U P L O T
        Version 5.0 patchlevel 6    last modified 2017-03-18

        Copyright (C) 1986-1993, 1998, 2004, 2007-2017
        Thomas Williams, Colin Kelley and many others

        gnuplot home:     http://www.gnuplot.info
        faq, bugs, etc:   type "help FAQ"
        immediate help:   type "help"  (plot window: hit 'h')

Terminal type set to 'wxt'
gnuplot> sh tics

        xyplane ticslevel is 0.5
        tics are in back of plot
        x-axis tics are IN,     major ticscale is 1 and minor ticscale is 0.5
        x-axis tics:    on border and mirrored on opposite border
          labels are justified automatically, format "% h" and are not rotated,
            offset (character 0, 0, 0)
          intervals computed automatically

[snip]

gnuplot> set xtics scale 10 1
gnuplot> sh tics

        xyplane ticslevel is 0.5
        tics are in back of plot
        x-axis tics are IN,     major ticscale is 10 and minor ticscale is 5
        x-axis tics:    on border and mirrored on opposite border
          labels are justified automatically, format "% h" and are not rotated,
            offset (character 0, 0, 0)
          series by 1
      
[snip]

gnuplot> 

Note that I did *not* get a minor tic interval of 1, but of 5.

If I now "plot [0:100] x" all the tics are labelled and there is no distinction between major and minor tics

Thanks,
Reg

Re: [Gnuplot-info] Linear mapping of xrange into a new range

[Hans-Bernhard B. <HBB...@t-...>]

Am 09.07.2019 um 16:38 schrieb Dario Sanfilippo:

> I'm plotting the magnitudes of some FFT processing by feeding Gnuplot with
> a 1-column, comma-separated csv file.

If there's only one column, it makes relatively little sense to speak
about column separators...

> So if I have 512 elements, the x-axis goes from 0 to 512, 

Let's make that 0 to 511.

> Is there a way to have the x-axis displaying the 0:512 range linearly
> mapped to, say, 0:24000?

See "help using".

Re: [Gnuplot-info] Linear mapping of xrange into a new range

[Ethan A M. <eam...@gm...>]

On Tuesday, 09 July 2019 16:38:41 Dario Sanfilippo wrote:
> Hello, list.
> 
> I must be looking for the wrong keywords as I haven't found a solution for
> this yet.
> 
> I'm plotting the magnitudes of some FFT processing by feeding Gnuplot with
> a 1-column, comma-separated csv file.
> 
> So if I have 512 elements, the x-axis goes from 0 to 512, and the
> magnitudes of the corresponding elements are on the y-axis.
> 
> Is there a way to have the x-axis displaying the 0:512 range linearly
> mapped to, say, 0:24000?


set datafile separator comma
plot DATA using ($0 * 24000./512.):1 with impulses

	Ethan


> 
> Thank you so much for your help,
> Dario
-- 
entia non sunt multiplicanda praeter necessitatem

[Gnuplot-info] Linear mapping of xrange into a new range

[Dario S. <san...@gm...>]

Hello, list.

I must be looking for the wrong keywords as I haven't found a solution for
this yet.

I'm plotting the magnitudes of some FFT processing by feeding Gnuplot with
a 1-column, comma-separated csv file.

So if I have 512 elements, the x-axis goes from 0 to 512, and the
magnitudes of the corresponding elements are on the y-axis.

Is there a way to have the x-axis displaying the 0:512 range linearly
mapped to, say, 0:24000?

Thank you so much for your help,
Dario

Re: [Gnuplot-info] Gnuplot ignoring missing data

[Dave H. <da...@ho...>]

Odd; I just noticed that another of my graphs has a discontinuity at 
missing data, yet I don't have the "set datafile missing 'x'" line, so 
what on earth could be wrong?  What have I not understood about missing 
data?

Taking that directive out of spamlog.gp indeed shows a discontinuity (see 
www.horsfall.org/spamlog-1.pdf) so something is definitely fishy here...

-- Dave

---------- Forwarded message ----------
Date: Sat, 6 Jul 2019 10:41:36 +1000 (EST)
From: Dave Horsfall <da...@ho...>
To: Gnuplot Mailing List <gnu...@li...>
Subject: Gnuplot ignoring missing data

Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.

Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
there is missing data there thanks to my ISP cutting my fibre and taking ages 
to fix it (great anti-spam measure, I suppose).

In my spamlog.gp, I have:

     set datafile    missing "x"
     ...
     plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
     ...

Sample line from spamlog.dat:

     2019/04/26      x x x x x x x x x
     (Actually tabs, not spaces)

Have I misunderstood what "missing" means?  It's been a while since I studied 
stats...  My understanding is just that: missing data, hence leave a hole in 
your graph (indistinguishable from zero in my case, but I can handle that).

A message on StackOverflow also says that the above should work and not draw a 
line across it (not that I trust StackOverflow anyway), but that's exactly what 
Gnuplot is doing.

Thanks.

-- Dave

Re: [Gnuplot-info] Gnuplot ignoring missing data

[Alan C. <ala...@gm...>]

I've found that a nan (not a number) just leaves a hole and nothing plots
for that point.

Sent from my Motorola XT1527

On Fri, Jul 5, 2019, 8:42 PM Dave Horsfall <da...@ho...> wrote:

> Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.
>
> Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the
> end;
> there is missing data there thanks to my ISP cutting my fibre and taking
> ages
> to fix it (great anti-spam measure, I suppose).
>
> In my spamlog.gp, I have:
>
>      set datafile    missing "x"
>      ...
>      plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
>      ...
>
> Sample line from spamlog.dat:
>
>      2019/04/26      x x x x x x x x x
>      (Actually tabs, not spaces)
>
> Have I misunderstood what "missing" means?  It's been a while since I
> studied
> stats...  My understanding is just that: missing data, hence leave a hole
> in
> your graph (indistinguishable from zero in my case, but I can handle that).
>
> A message on StackOverflow also says that the above should work and not
> draw a
> line across it (not that I trust StackOverflow anyway), but that's exactly
> what
> Gnuplot is doing.
>
> Thanks.
>
> -- Dave
>
>
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> Membership management via:
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

[Gnuplot-info] Gnuplot ignoring missing data

[Dave H. <da...@ho...>]

Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.

Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
there is missing data there thanks to my ISP cutting my fibre and taking ages 
to fix it (great anti-spam measure, I suppose).

In my spamlog.gp, I have:

     set datafile    missing "x"
     ...
     plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
     ...

Sample line from spamlog.dat:

     2019/04/26      x x x x x x x x x
     (Actually tabs, not spaces)

Have I misunderstood what "missing" means?  It's been a while since I studied 
stats...  My understanding is just that: missing data, hence leave a hole in 
your graph (indistinguishable from zero in my case, but I can handle that).

A message on StackOverflow also says that the above should work and not draw a 
line across it (not that I trust StackOverflow anyway), but that's exactly what 
Gnuplot is doing.

Thanks.

-- Dave

Re: [Gnuplot-info] range of fitted variable

[Tatsuro M. <tma...@ya...>]

For sophisticated data analysis, please consider use other tools.
Python +SciPy+NumPy+Matplotlib on Jupyter-Lab, GNU Octave, or Scilab.

gnuplot is a basically plotting tool and do not expect to use it for complicated cases.

Tatsuro



----- Original Message -----
> From: Patrick Dupre 
> To: tmacchant3
> Cc: 
> Date: 2019/6/30, Sun 16:52
> Subject: Re: [Gnuplot-info] range of fitted variable
> 
> Yes, It is interesting. Thanks.
> Finally, used the conditional ()?{}:{} to restrict the parameter range.
> 
> ===========================================================================
> Patrick DUPRÉ                                 | | email: pd...@gm...
> Laboratoire interdisciplinaire Carnot de Bourgogne
> 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
> Tel: +33 (0)380395988
> ===========================================================================
> 
> 
>>  Sent: Sunday, June 30, 2019 at 1:44 AM
>>  From: "Tatsuro MATSUOKA" <tma...@ya...>
>>  To: "Patrick Dupre" <pd...@gm...>
>>  Cc: gnu...@li...
>>  Subject: Re: [Gnuplot-info] range of fitted variable
>> 
>>  Tricks are given in the below
>> 
>>  http://gnuplot-tricks.blogspot.com/2009/12/restricting-fit-parameters.html 
>> 
>> 
>> 
>>  Tatsuro
>> 
>> 
>>  ----- Original Message -----
>>  > From: Tatsuro MATSUOKA
>>  > To: Patrick Dupre 
>>  > Cc: gnuplot-info> Date: 2019/6/30, S
>>  un 08:17
>>  > Subject: Re: [Gnuplot-info] range of fitted variable
>>  > 
>>  >>  Even with Marquardt-Levenberg method, you can constrain 
> parameters.
>>  > 
>>  > OK. This is just my ignorance.
>>  > Anyway, gnuplot fit uses unconstrained least square method.
>>  > 
>>  >>  Anyway, you can always does it in the function, and put the 
> constrains here
>>  >>  since conditional statement are accepted. 
>>  > 
>>  > help fit says
>>  > gnuplot> help fit
>>  >  The `fit` command fits a user-supplied real-valued expression to a 
> set of
>>  >  data points, using the nonlinear least-squares Marquardt-Levenberg
>>  >  algorithm. There can be up to 12 independent variables, there is 
> always 1
>>  >  dependent variable, and any number of parameters can be fitted.
>>  >  Optionally, error estimates can be input for weighting the data 
> points.
>>  > 
>>  >  The basic use of `fit` is best explained by a simple example:
>>  > 
>>  >        f(x) = a + b*x + c*x**2
>>  >        fit f(x) 'measured.dat' using 1:2 via a,b,c
>>  >        plot 'measured.dat' u 1:2, f(x)
>>  > 
>>  >  Syntax:
>>  >        fit {<ranges>} <expression>
>>  >            '<datafile>' {datafile-modifiers}
>>  >            {{unitweights} | {y|xy|z}error | errors 
>>  > <var1>{,<var2>,...}}
>>  >            via '<parameter file>' | 
>>  > <var1>{,<var2>,...}
>>  > 
>>  > 
>>  > ----- Original Message -----
>>  > 
>>  >>  From: Patrick Dupre 
>>  >>  To: Tatsuro MATSUOKA 
>>  >>  Cc: gnuplot 
>>  >>  Date: 2019/6/30, Sun 07:18
>>  >>  Subject: Re: [Gnuplot-info] range of fitted variable
>>  >> 
>>  >>  Hello,
>>  >> 
>>  >>  I am not sure that it is a helfull response.
>>  >>  Even with Marquardt-Levenberg method, you can constrain 
> parameters.
>>  >>  Anyway, you can always does it in the function, and put the 
> constrains here
>>  >>  since conditional statement are accepted.
>>  >> 
>>  >>  Regards.
>>  >> 
>>  >>>   Subject: Re: [Gnuplot-info] range of fitted variable
>>  >>> 
>>  >>>   --- pdupre
>>  >>>   > Hello,
>>  >>>   >
>>  >>>   > Can I set a range to the fitted variable ?
>>  >>>   > An option could be to set a if (condition) in the 
> fitting 
>>  > function. Is 
>>  >>  it possible?
>>  >>>   >
>>  >>>   > Thanks
>>  >>>   >
>>  >>> 
>>  >>>   fit of gnuplot use Marquardt-Levenberg method.
>>  >>>   Marquardt-Levenberg method is a uncostrained method. You 
> cannot set 
>>  > bounds 
>>  >>  of parameters.
>>  >>> 
>>  >>>   Tatsuro
>>  >>> 
>>  >>> 
>>  >> 
>>  > 
>> 
>> 
> 

Re: [Gnuplot-info] range of fitted variable

[Tatsuro M. <tma...@ya...>]

Tricks are given in the below

http://gnuplot-tricks.blogspot.com/2009/12/restricting-fit-parameters.html



Tatsuro


----- Original Message -----
> From: Tatsuro MATSUOKA
> To: Patrick Dupre 
> Cc: gnuplot-info> Date: 2019/6/30, S
un 08:17
> Subject: Re: [Gnuplot-info] range of fitted variable
> 
>>  Even with Marquardt-Levenberg method, you can constrain parameters.
> 
> OK. This is just my ignorance.
> Anyway, gnuplot fit uses unconstrained least square method.
> 
>>  Anyway, you can always does it in the function, and put the constrains here
>>  since conditional statement are accepted. 
> 
> help fit says
> gnuplot> help fit
>  The `fit` command fits a user-supplied real-valued expression to a set of
>  data points, using the nonlinear least-squares Marquardt-Levenberg
>  algorithm. There can be up to 12 independent variables, there is always 1
>  dependent variable, and any number of parameters can be fitted.
>  Optionally, error estimates can be input for weighting the data points.
> 
>  The basic use of `fit` is best explained by a simple example:
> 
>        f(x) = a + b*x + c*x**2
>        fit f(x) 'measured.dat' using 1:2 via a,b,c
>        plot 'measured.dat' u 1:2, f(x)
> 
>  Syntax:
>        fit {<ranges>} <expression>
>            '<datafile>' {datafile-modifiers}
>            {{unitweights} | {y|xy|z}error | errors 
> <var1>{,<var2>,...}}
>            via '<parameter file>' | 
> <var1>{,<var2>,...}
> 
> 
> ----- Original Message -----
> 
>>  From: Patrick Dupre 
>>  To: Tatsuro MATSUOKA 
>>  Cc: gnuplot 
>>  Date: 2019/6/30, Sun 07:18
>>  Subject: Re: [Gnuplot-info] range of fitted variable
>> 
>>  Hello,
>> 
>>  I am not sure that it is a helfull response.
>>  Even with Marquardt-Levenberg method, you can constrain parameters.
>>  Anyway, you can always does it in the function, and put the constrains here
>>  since conditional statement are accepted.
>> 
>>  Regards.
>> 
>>>   Subject: Re: [Gnuplot-info] range of fitted variable
>>> 
>>>   --- pdupre
>>>   > Hello,
>>>   >
>>>   > Can I set a range to the fitted variable ?
>>>   > An option could be to set a if (condition) in the fitting 
> function. Is 
>>  it possible?
>>>   >
>>>   > Thanks
>>>   >
>>> 
>>>   fit of gnuplot use Marquardt-Levenberg method.
>>>   Marquardt-Levenberg method is a uncostrained method. You cannot set 
> bounds 
>>  of parameters.
>>> 
>>>   Tatsuro
>>> 
>>> 
>> 
> 

Re: [Gnuplot-info] range of fitted variable

[Tatsuro M. <tma...@ya...>]

> Even with Marquardt-Levenberg method, you can constrain parameters.

OK. This is just my ignorance.
Anyway, gnuplot fit uses unconstrained least square method.

> Anyway, you can always does it in the function, and put the constrains here
> since conditional statement are accepted. 

help fit says
gnuplot> help fit
 The `fit` command fits a user-supplied real-valued expression to a set of
 data points, using the nonlinear least-squares Marquardt-Levenberg
 algorithm. There can be up to 12 independent variables, there is always 1
 dependent variable, and any number of parameters can be fitted.
 Optionally, error estimates can be input for weighting the data points.

 The basic use of `fit` is best explained by a simple example:

       f(x) = a + b*x + c*x**2
       fit f(x) 'measured.dat' using 1:2 via a,b,c
       plot 'measured.dat' u 1:2, f(x)

 Syntax:
       fit {<ranges>} <expression>
           '<datafile>' {datafile-modifiers}
           {{unitweights} | {y|xy|z}error | errors <var1>{,<var2>,...}}
           via '<parameter file>' | <var1>{,<var2>,...}


----- Original Message -----

> From: Patrick Dupre 
> To: Tatsuro MATSUOKA 
> Cc: gnuplot 
> Date: 2019/6/30, Sun 07:18
> Subject: Re: [Gnuplot-info] range of fitted variable
> 
> Hello,
> 
> I am not sure that it is a helfull response.
> Even with Marquardt-Levenberg method, you can constrain parameters.
> Anyway, you can always does it in the function, and put the constrains here
> since conditional statement are accepted.
> 
> Regards.
> 
>>  Subject: Re: [Gnuplot-info] range of fitted variable
>> 
>>  --- pdupre
>>  > Hello,
>>  >
>>  > Can I set a range to the fitted variable ?
>>  > An option could be to set a if (condition) in the fitting function. Is 
> it possible?
>>  >
>>  > Thanks
>>  >
>> 
>>  fit of gnuplot use Marquardt-Levenberg method.
>>  Marquardt-Levenberg method is a uncostrained method. You cannot set bounds 
> of parameters.
>> 
>>  Tatsuro
>> 
>> 
>