gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Using same point style on linespoints

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

On Sat, 20 Sep 2014, Dave Horsfall wrote:

> On Fri, 19 Sep 2014, Marek W. Gutowski wrote:

Sorry, all; that should've gone straight to Marek.

-- Dave

Re: [Gnuplot-info] Using same point style on linespoints

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

On Fri, 19 Sep 2014, Marek W. Gutowski wrote:

> First run the command
> gnuplot> test

Neat!  Thanks; I'm going to laminate that page...

> gnuplot> plot "your_data_file" using 1:2 with linespoints ilne type 3 
> pointype 4

Ah, that reminds me: I'm also plotting -- or rather, trying to plot -- my 
BMI (body mass index), which is weight divided by height squared (pref. in 
metric units).

I have:

    #
    # BMI stuff (kg/m^2).
    #
    height = 1.83           # A bit over 6ft - must check
    bmi(weight) = weight/(height*height)

    [...]

    set style data linespoints

    [...]

    plot datafile using 1:($3) title 'Weight (kg)', \
	bmi($3) title 'BMI (kg/m^2)' with linespoints, \
	datafile using 1:($4) title 'Girth (cm)', \
	datafile using 1:($5) title 'Sys (Hg)', \
	datafile using 1:($6) title 'Dia (Hg)', \
	datafile using 1:($7) title 'HR (bpm)'

Now, without the "linespoints" on the bmi() line, the BMI key is just a 
line; with it, the BMI key gains a point, so I assume that the style is 
defaulted for plotting user functions.

The thing is, no BMI data is printed, no matter how much I fake the 
numbers from lightweight to heavyweight, so please, what am I missing?

I've tried setting some sort of a range, but I get syntax errors.

Thanks.

-- Dave

[Gnuplot-info] Using same point style on linespoints

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

First, some background.  I am plotting health readings such as BP and 
pulse etc, and sometimes I forget (well, I am nearly 62!).  I've already 
figured out the missing data bit.

Now, should I have a row of valid data surrounded by missing data, it does 
not show at all with "lines", which led to much head-scratching...

If I use "linespoints" it indeed shows, but having different-looking 
points looks odd IMHO, and I can't find a way to specify the point style 
itself.

So, is there a way to force the points to be the same?  I'd like something 
like a small square, diamond, blob, cross, plus, etc.

Thanks.

-- Dave

Re: [Gnuplot-info] variable colors

[Mahmood N <nt_...@ya...>]

>No attachments seemed to be attached...
OK it seems that the list prevent me from sending attachments. I am CCing you so that you can see the screen shot.

> And have you done something funny in your Gnuplot setup, like, inverting all colours or something??
No. I have just entered a default working directory in the "start in" field in the shortcut (on windows)



Regards,
Mahmood 

Re: [Gnuplot-info] variable colors

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

On Thu, 11 Sep 2014, Mahmood Naderan wrote:

> It seems that there is some thing wrong with interpreting hex numbers. 
> Please see the attached shot.

No attachments seemed to be attached...

> If I use decimal values, it is ok. But if I use 0xFFFFFF then the color 
> is black!!

What happens when you use e.g. 0xFF0000, 0x00FF00, 0x0000FF, and for 
laughs, 0x000000?

And have you done something funny in your Gnuplot setup, like, inverting 
all colours or something??

> Sorry if I shouldn't send attachments on the list.

It could be that the list strips them.

-- Dave

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Re: [Gnuplot-info] variable colors

[Mahmood N. <nt_...@ya...>]

It seems that there is some thing wrong with interpreting hex numbers. Please see the attached shot.
If I use decimal values, it is ok. But if I use 0xFFFFFF then the color is black!!

 
Sorry if I shouldn't send attachments on the list.


Regards,
Mahmood 


On Thursday, September 11, 2014 5:04 PM, Tait <gnu...@t4...> wrote:
 



You're using 4.6p3, and wxt on Windows. I tried the same
configuration, and get different (normal) results. Is there perhaps
something in your gnuplot.ini or wgnuplot.ini file(s) that's
altering the normal startup default settings? Does something simple
like even just "plot x" draw a black line, or a red line? Is the
behavior different if you start the program as "wgnuplot.exe -d"
instead of as just "wgnuplot.exe"?



> I tried with your example, but still all points are black.
> I will send a screenshot to you.
> 
> Regards,
> Mahmood 
> 
> > unset key
> > plot '-' using 0:2:1 linecolor rgb variable pointtype 5 pointsize 3
> > 0xaabbcc 10
> > 0xee0000 13
> > 0x00aa00 16
> > 0x222299 18
> > 0x0a0304 20
> > e

Re: [Gnuplot-info] variable colors

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

You're using 4.6p3, and wxt on Windows. I tried the same
configuration, and get different (normal) results. Is there perhaps
something in your gnuplot.ini or wgnuplot.ini file(s) that's
altering the normal startup default settings? Does something simple
like even just "plot x" draw a black line, or a red line? Is the
behavior different if you start the program as "wgnuplot.exe -d"
instead of as just "wgnuplot.exe"?


> I tried with your example, but still all points are black.
> I will send a screenshot to you.
> 
> Regards,
> Mahmood 
> 
> > unset key
> > plot '-' using 0:2:1 linecolor rgb variable pointtype 5 pointsize 3
> > 0xaabbcc 10
> > 0xee0000 13
> > 0x00aa00 16
> > 0x222299 18
> > 0x0a0304 20
> > e

Re: [Gnuplot-info] variable colors

[Mahmood N. <nt_...@ya...>]

I tried with your example, but still all points are black.
I will send a screenshot to you.

 
Regards,
Mahmood 


On Thursday, September 11, 2014 1:12 AM, Tait <gnu...@t4...> wrote:
 



As a string, it's hex: "... linecolor rgbcolor '#30a0f0'". As a
bare number or linecolor variable, it's a packed tuple (or quad,
when alpha-channel is involved) as an integer: 8 bits of red, 8
bits of green, then 8 bits of blue. Creating that number is what
the rgb function does in the example I used. Whether you represent
that integer in decimal, hexadecimal, or octal is of no matter to
gnuplot. Pure blue would be 255 or 0xff; pure green 255 << 8, or
65280 or 0xff00; and pure red 255 << 16, or 16711680 or 0xff0000. A
50% gray would be 8421504 or 0x808080.

Your 0xaabbcc... example below works for me. Note that with only
two points, the default auto-range will put either point on the
extreme of the graph, and one is gray and the other black, so it'd
be easy to overlook that it's actually working. To make it more
obvious, try more points/colors:

unset key
plot '-' using 0:2:1 linecolor rgb variable pointtype 5 pointsize 3
0xaabbcc 10
0xee0000 13
0x00aa00 16
0x222299 18
0x0a0304 20
e

The 400 and 800 values as colors will both be dark blues, and
perhaps mistakable for black if one doesn't look carefully.

Re: [Gnuplot-info] variable colors

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

As a string, it's hex: "... linecolor rgbcolor '#30a0f0'". As a
bare number or linecolor variable, it's a packed tuple (or quad,
when alpha-channel is involved) as an integer: 8 bits of red, 8
bits of green, then 8 bits of blue. Creating that number is what
the rgb function does in the example I used. Whether you represent
that integer in decimal, hexadecimal, or octal is of no matter to
gnuplot. Pure blue would be 255 or 0xff; pure green 255 << 8, or
65280 or 0xff00; and pure red 255 << 16, or 16711680 or 0xff0000. A
50% gray would be 8421504 or 0x808080.

Your 0xaabbcc... example below works for me. Note that with only
two points, the default auto-range will put either point on the
extreme of the graph, and one is gray and the other black, so it'd
be easy to overlook that it's actually working. To make it more
obvious, try more points/colors:

unset key
plot '-' using 0:2:1 linecolor rgb variable pointtype 5 pointsize 3
0xaabbcc 10
0xee0000 13
0x00aa00 16
0x222299 18
0x0a0304 20
e

The 400 and 800 values as colors will both be dark blues, and
perhaps mistakable for black if one doesn't look carefully.

Mahmood Naderan <nt_...@ya...> said (on 2014/09/10):
> OK I got it. One more question. What is the correct format for representing the color number? hex or dec?
> I have a data file  where the first column is the color number and the second column is the Y-axis.
> 
> When I write
> 
> 400 10
> 800 20
> 
> Both points are black. Also when I write
> 
> 0xAABBCC   10
> 0x0A0304   20
> 
> again both are black. I use the following command
> 
>  plot 'test.dat' using 0:2:1 linecolor rgb variable pt 3
> 
> 
>  
> Regards,
> Mahmood 

Re: [Gnuplot-info] Annotating data points

[BBands <bb...@gm...>]

Ben,

Not at all sure about how best to deal with the offsets issue, but
often a worked example can be helpful.

Best,

      John

On Wed, Sep 10, 2014 at 9:55 AM, benni <cm...@we...> wrote:
> Hey John,
> nice tip. I didn't try it, but does the offset not cause a problem with
> changing scalings? I guess that it is calculated with the first coordinate
> system.
> So if one adjust the offset for its purposes and then add additional datas
> and labels, then the offset might change as the visual distance change with
> the scaling. I think that is what Dave - and at least me - was concerned
> about at most.

Re: [Gnuplot-info] Annotating data points

[benni <cm...@we...>]

Hey John,
nice tip. I didn't try it, but does the offset not cause a problem with
changing scalings? I guess that it is calculated with the first coordinate
system.
So if one adjust the offset for its purposes and then add additional datas
and labels, then the offset might change as the visual distance change with
the scaling. I think that is what Dave - and at least me - was concerned
about at most.

Greets
Ben

2014-09-10 18:00 GMT+02:00 BBands <bb...@gm...>:

> If you know your labels before hand there is a solution that might
> work for you here:
> http://stackoverflow.com/questions/15170696/gnuplot-plot-labelled-data
>
> John
>

Re: [Gnuplot-info] Annotating data points

[BBands <bb...@gm...>]

If you know your labels before hand there is a solution that might
work for you here:
http://stackoverflow.com/questions/15170696/gnuplot-plot-labelled-data

John

Re: [Gnuplot-info] variable colors

[Mahmood N. <nt_...@ya...>]

OK I got it. One more question. What is the correct format for representing the color number? hex or dec?
I have a data file  where the first column is the color number and the second column is the Y-axis.

When I write

400 10
800 20

Both points are black. Also when I write

0xAABBCC   10
0x0A0304   20

again both are black. I use the following command

 plot 'test.dat' using 0:2:1 linecolor rgb variable pt 3


 
Regards,
Mahmood 


On Wednesday, September 10, 2014 11:31 AM, Tait <gnu...@t4...> wrote:
 



"... linecolor" is an argument to the plot command, not the "set
terminal" command. Although the help files are not as clear as they
could be, you can see how it's used in the demos (e.g.
varcolor.dem) for additional hints. Specifically, "linecolor
variable" means the color of each point or portion of the line will
be determined by data from the user-provided file or input. If you
do not provide the additional data to color each segment, then it
probably defaults to black, which could explain your observation.

If you just want each line to be a different color, then that is
already the default behavior and you don't need to do anything
more. If you want to color each portion of each line differently,
then take a look at the demos to get you started, or something
simple like this may be illustrative enough:

unset key
set style data linespoints
# for r,g,b in range [0,1)
rgb(r,g,b)=int(r*2**24)|int(g*2**16)|(int(b)*2**8)
# make up something arbitrary...
colorfunc(x) = rgb((1+cos(x))*0.3, (1+sin(x-1))*0.15, (1+sin(x))*0.4)
plot '+' using 1:(sin($1)):(colorfunc($1)) \
    linewidth 4 linecolor rgbcolor variable



Mahmood Naderan <nt_...@ya...> said (on 2014/09/10):
> Hello,
> I want to use "linecolor rgb variable". However, the final colors are all black!
> This is verified with the following commands
> 
> set term wxt
> set term post eps enhanced color blacktext size 4,2.7 solid "Times-Roman" 12
> 
> I didn't find any option for variable colors while setting the terms.
>  
> 
> Regards,
> Mahmood

Re: [Gnuplot-info] Annotating data points

[benni <cm...@we...>]

Hey guys, at first: this is my first reply to this mailing list. Don't
shoot at me when I am doing it wrong.

Message: 8
Date: Mon, 8 Sep 2014 14:58:38 +1000 (EST)
From: Dave Horsfall <da...@ho...>
Subject: [Gnuplot-info] Annotating data points
To: Gnuplot Mailing List <gnu...@li...>
Message-ID: <alp...@an...>
Content-Type: TEXT/PLAIN; charset=US-ASCII

Hi Dave,
just read your message

Is there a way to annotate a data point without working out its
> coordinates?  Plotting my gas/water usage, I'd like to see something like:



>     8/9 3.44 "Gas way up for some reason" 0.27 "Water holding steady"
>
> I thougt about this problem once, but never finished it to the end.
My advice: play with the coordinate system.
(I hope), you know that you can choose different coordinate systems, like
 `first`, `second`, `graph`, `screen`, or `character` (see also "help
coordinates" in gnuplot).

My solution would be, choosing first or second, and using an offset. For
your purposes you can enter dates for he xvalues too.

Of course the offset will mess up if you add to many points and change the
sizes to much. But all in all I think this should work for the first run.

Try it!
Greets
benni
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Re: [Gnuplot-info] variable colors

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

"... linecolor" is an argument to the plot command, not the "set
terminal" command. Although the help files are not as clear as they
could be, you can see how it's used in the demos (e.g.
varcolor.dem) for additional hints. Specifically, "linecolor
variable" means the color of each point or portion of the line will
be determined by data from the user-provided file or input. If you
do not provide the additional data to color each segment, then it
probably defaults to black, which could explain your observation.

If you just want each line to be a different color, then that is
already the default behavior and you don't need to do anything
more. If you want to color each portion of each line differently,
then take a look at the demos to get you started, or something
simple like this may be illustrative enough:

unset key
set style data linespoints
# for r,g,b in range [0,1)
rgb(r,g,b)=int(r*2**24)|int(g*2**16)|(int(b)*2**8)
# make up something arbitrary...
colorfunc(x) = rgb((1+cos(x))*0.3, (1+sin(x-1))*0.15, (1+sin(x))*0.4)
plot '+' using 1:(sin($1)):(colorfunc($1)) \
    linewidth 4 linecolor rgbcolor variable


Mahmood Naderan <nt_...@ya...> said (on 2014/09/10):
> Hello,
> I want to use "linecolor rgb variable". However, the final colors are all black!
> This is verified with the following commands
> 
> set term wxt
> set term post eps enhanced color blacktext size 4,2.7 solid "Times-Roman" 12
> 
> I didn't find any option for variable colors while setting the terms.
>  
> 
> Regards,
> Mahmood

[Gnuplot-info] variable colors

[Mahmood N. <nt_...@ya...>]

Hello,
I want to use "linecolor rgb variable". However, the final colors are all black!
This is verified with the following commands

set term wxt
set term post eps enhanced color blacktext size 4,2.7 solid "Times-Roman" 12

I didn't find any option for variable colors while setting the terms.
 

Regards,
Mahmood

[Gnuplot-info] Annotating data points

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

I must say, Gnuplot is amazing!  It can do everything except butter my 
toast for me.  Anyway...

Is there a way to annotate a data point without working out its 
coordinates?  Plotting my gas/water usage, I'd like to see something like:

    8/9	3.44 "Gas way up for some reason" 0.27 "Water holding steady"

etc.

I'm a bit bothered that each time I add data, I may need to recompute the 
coords for all of the annotations (apart from having to compute them in 
the first place), due to the scale changing, and I'm a firm believer in 
making computers do what computers do best i.e. the boring stuff.

Thanks.

-- Dave

Re: [Gnuplot-info] scale y axis to smooth curve

[Thomas S. <t.s...@fz...>]

Andras Horvath <mail <at> log69.com> writes:

> 
> Hi,
> 
> I plot data using the smooth csplines type curve and the y axis does not
scale down to the resulted curve, but
> shows a maximum value of the input data that would anyway be seen when
using the normal straight lines for plotting.
> 
> Could anyone kindly tell me if it is possible to scale down the y axis to
the drawn smooth curve?
> 
> 2 examples (first with normal lines, second drawn with smooth curves):
> 
> http://i.imgur.com/AmvODbV.png
> http://i.imgur.com/pvVnd1Z.png
> 
> Thanks,
> 
> Andras

you may write the smoothed data points into a table
(see "set table") and use this file for plotting:

set table "table_filename"
plot "your_data_file" ...
unset table
plot "table_filename" using 1:2 ...

Re: [Gnuplot-info] scale y axis to smooth curve

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

On Tue, 2 Sep 2014, Andras Horvath wrote:

[...]

> Could anyone kindly tell me if it is possible to scale down the y axis 
> to the drawn smooth curve?

Have you tried using a logarithmic scale?

-- Dave

[Gnuplot-info] scale y axis to smooth curve

[Andras H. <ma...@lo...>]

Hi,

I plot data using the smooth csplines type curve and the y axis does not scale down to the resulted curve, but shows a maximum value of the input data that would anyway be seen when using the normal straight lines for plotting.

Could anyone kindly tell me if it is possible to scale down the y axis to the drawn smooth curve?

2 examples (first with normal lines, second drawn with smooth curves):

http://i.imgur.com/AmvODbV.png
http://i.imgur.com/pvVnd1Z.png


Thanks,

Andras

Re: [Gnuplot-info] Plotting the differences between values

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

On Sat, 30 Aug 2014, sfeam wrote:

> From the online demos:
> http://gnuplot.sourceforge.net/demo/running_avg.html

Perfect!  Dunno how I missed that; I really must buy the book (I do have 
the PDF, but it's awkward curling up in bed with it).

Heck, I'll soon be thinking that Gnuplot is Turing-complete.  Oh, wait...

-- Dave

Re: [Gnuplot-info] Plotting the differences between values

[sfeam <sf...@us...>]

On Sunday, 31 August 2014 02:51:50 AM Dave Horsfall wrote:
> Gnuplot 4.6.5 on MacOS Mavericks (at last!)
> 
> How do I plot differences between successive values?  I am monitoring my 
> water and gas consumption; naturally the utility meter shows cumulative 
> consumption but I want to see my weekly consumption to see whether my 
> "green" measures are having any effect (my electricity meter is padlocked 
> so I cannot see it).
> 
> I'd like to record the actual meter readings, and get Gnuplot to work out 
> the differences itself (that's what computers are for, after all).

>From the online demos:

  http://gnuplot.sourceforge.net/demo/running_avg.html

[Gnuplot-info] Plotting the differences between values

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

Gnuplot 4.6.5 on MacOS Mavericks (at last!)

How do I plot differences between successive values?  I am monitoring my 
water and gas consumption; naturally the utility meter shows cumulative 
consumption but I want to see my weekly consumption to see whether my 
"green" measures are having any effect (my electricity meter is padlocked 
so I cannot see it).

I'd like to record the actual meter readings, and get Gnuplot to work out 
the differences itself (that's what computers are for, after all).

Thanks.

-- Dave

[Gnuplot-info] two standard deviations

[Stuart K. <stu...@gm...>]

How might I calculate two standard deviations?

Using the STATS package, I'm calculating one stdev, but I don't see an
obvious way to do two.

?

--sk

Stuart Kendrick

$ cat gnuplot.gp
[...]
# Calculate statistics
stats input_file index 0 using ((($1/1000.0)/1000.0)/8.0)

# Figure out where to put the labels
line_width = (STATS_max - STATS_min) / 25
y_offset   = STATS_records * .1

# Stats labels
set label 1 sprintf("Minimum = %.2f", STATS_min)    at y_offset,
STATS_min   + line_width*5 front
set label 2 sprintf("Maximum = %.2f", STATS_max)    at y_offset,
STATS_min   + line_width*4 front
set label 3 sprintf("Mean = %.2f"   , STATS_mean)   at y_offset,
STATS_min   + line_width*3 front
set label 4 sprintf("Median = %.2f",  STATS_median) at y_offset,
STATS_min   + line_width*2 front
set label 5 sprintf("Stdev= %.2f",    STATS_stddev) at y_offset,
STATS_min   + line_width*1 front

# Do the work
plot input_file index 0 using 0:((($1/1000.0)/1000.0)/8.0) title ''
with points pointtype 7 pointsize 2 linecolor rgb \ "blue",
STATS_median title " Median" linecolor rgb "green", STATS_mean title "
Mean" linecolor rgb "purple"