gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] A muscular blonde working out in this movie from Tutuy

[Mia W. <dav...@gm...>]

Hello Gnuplot-info!!
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[Gnuplot-info] depth in gnuplot?

[Luiz F. C C. <lf...@gm...>]

Hello, I'm new to the List and a new gnuplot user as well. I hope
you don't mind my asking this beginner's question. Here it goes:

I am trying to make a plot of the region in xy-plane bounded by the
curves x=-y^2, x-y=4, y=-1 and y=2. This is what I got so far:


set trange [-1:2]
set xrange [-5:7]
set yrange [-2:3]
unset key
set size 1,1
set origin 0,0
set multiplot
set size 1,1
set origin 0,0
plot 2 lt -1, -1 lt -1, sqrt(-x) lt -1, -sqrt(-x) lt -1, x-4 lt -1
set size 1,1
set origin 0,0
set parametric
plot -t**2, t lt 5 with filledcu y2, t+4, t lt -2 with filledcu y2
unset multiplot
reset


It took me the whole afternoon to come up with this ;)

The problem is I can't see distinctly and completely the lines that
make up the boundary of the region. What be done? is there anything
such as depth as in xfig or is there an easier way to achieve this?
I will appreciate any help.

Thanks, 

Luiz Fernando

Re: [Gnuplot-info] keep one window

[<br...@ph...>]

Shuxia Zhang wrote:

> My problem is tougher than that. I have a friend
> who could get the plot updated on one-window by lauching something like 
> this:
> 
>  gnuplot -persist -clear -tvtwm < fplot0
>  gnuplot -persist -clear -tvtwm < fplot1
>  gnuplot -persist -clear -tvtwm < fplot1

I'm quite sure that this ever working was an illusion, caused by not 
looking close enough to notice the differences.  The above will open 
*three* windows, and leave behind three gnuplot_x11 processes.  They may 
show up all in the same place, on top of each other, so they could be 
hard to distinguish, but they're there.

> But now it does not work any more. We could not figure out
> what is the cause.

Start with temporal coincidence then: what did he change to his system 
when this stopped working?

Re: [Gnuplot-info] keep one window

[Shuxia Z. <sz...@ms...>]

Thanks for the reply. I know what what you said "
You have to keep a gnuplot process open, and generate
fresh plots by sending it new commands from time to time".
Actually many examples you can find from the web.

My problem is tougher than that. I have a friend
who could get the plot updated on one-window by lauching 
something like this:

  gnuplot -persist -clear -tvtwm < fplot0
  gnuplot -persist -clear -tvtwm < fplot1
  gnuplot -persist -clear -tvtwm < fplot1

But now it does not work any more. We could not figure out
what is the cause.

Any ideas?

Shuxia

Re: [Gnuplot-info] keep one window

[<br...@ph...>]

Shuxia Zhang wrote:

> I tried to use gnuplot to disply a set of x-y plots
> on ONE frame/window, instead of poping more windows.

That's actually quite simple: you do that by not restarting gnuplot for 
every plot.  You have to keep a gnuplot process open, and generate fresh 
plots by sending it new commands from time to time, typically through a 
pipe fed by another process.

> gnuplot -persist -clear -tvtwm < fplot0
> gnuplot -persist -clear -tvtwm < fplot1
> gnuplot -persist -clear -tvtwm < fplot1

-persist is exactly the option you should not use.  That's used to keep
gnuplot's graph windows open indefinitely.  That's working in the exact
opposite direction of what you were trying to do.

> where fplot0 contains
> 
>    plot    "force.dat" using 1:2 title 'Column' with linespoints
>    save 'my.plt';
> 
> and fplot1 contains
> 
>  load 'my.plt';
>  replot    "force.dat" using 1:2 title 'Column' with linespoints

That doesn't make any sense at all.  That 'replot' doesn't achieve 
anything useful.

[Gnuplot-info] keep one window

[Shuxia Z. <sz...@ms...>]

I tried to use gnuplot to disply a set of x-y plots
on ONE frame/window, instead of poping more windows.
And I cannot merger fplot1 with flot0 since it was
not generated yet. (A real time data display.)

Here is what I did:

gnuplot -persist -clear -tvtwm < fplot0
gnuplot -persist -clear -tvtwm < fplot1
gnuplot -persist -clear -tvtwm < fplot1

where fplot0 contains

    plot    "force.dat" using 1:2 title 'Column' with linespoints
    save 'my.plt';

and fplot1 contains

  load 'my.plt';
  replot    "force.dat" using 1:2 title 'Column' with linespoints

I thought it should work, but it did not. Still poping more
windows.

Does anybody have a better idea?

Thanks,

Shuxia Zhang

Re: [Gnuplot-info] { and }

[<br...@ph...>]

R.S. Bhalerao wrote:
> How to get { and } in a label? 

By escaping it, I should think:

	set label 'a\{2\}'

(if you use "" quotes, you have to double those backslashes)

[Gnuplot-info] { and }

[R.S. B. <bha...@nu...>]

Hi,

How to get { and } in a label? 
I need the label to look like: a{2}

I am using:

set terminal postscript port enhanced
set output 'fig.ps'
set xlabel "{/Symbol \??? }"

What number should I use in place of '???'
Are the list of symbols and the corresponding numbers available on-line?

Thanks for your help.

... R S Bhalerao

[Gnuplot-info] { and }

[R.S. B. <bha...@nu...>]

Hi,

How to get { and } in the labels? 
I want the lable to look like: a{2}

Thanks for your help.

... R S Bhalerao

Re: [Gnuplot-info] Re: Time plots in v4.0

[<br...@ph...>]

Shanks N wrote:
> Hans-Bernhard Bröker wrote:

>>     set xdata time ; set timedata x "%d-%m-%Y"
>>     set ydata time ; set timedata y "%H:%M"
>>     p 'time.dat' u 1:2:2:3 w err

> I'm sorry, that didn't work; I can't seem to find the keyword 'timedata' 
>  in the help topics.

My bad.  That should have read 'timefmt' in both cases.

[Gnuplot-info] Re: Time plots in v4.0

[Shanks N <sha...@gm...>]

Hans-Bernhard Bröker wrote:
> Shanks N wrote:
> 
>> plot "time.dat" using 1:2:3 with errorbars
>> plot "time.dat" using 1:2:3 with errorlines
> 
> Something like this might work:
> 
>     set xdata time ; set timedata x "%d-%m-%Y"
>     set ydata time ; set timedata y "%H:%M"
>     p 'time.dat' u 1:2:2:3 w err
> 
> Since you have ylow and yhigh instead of ydelta, you need 4 using specs 
> for errorbars.
> 
>
I'm sorry, that didn't work; I can't seem to find the keyword 'timedata' 
  in the help topics.

Can you please explain?  I got the part about needing 4 specs.

regards,
Shanks

Re: [Gnuplot-info] Time plots in v4.0

[<br...@ph...>]

Shanks N wrote:

> plot "time.dat" using 1:2:3 with errorbars
> plot "time.dat" using 1:2:3 with errorlines

Something like this might work:

	set xdata time ; set timedata x "%d-%m-%Y"
	set ydata time ; set timedata y "%H:%M"
	p 'time.dat' u 1:2:2:3 w err

Since you have ylow and yhigh instead of ydelta, you need 4 using specs 
for errorbars.

[Gnuplot-info] Time plots in v4.0

[Shanks N <sha...@gm...>]

How do I get y, y+delta plots of these job runs

#date      strt   end
19-03-2006 21:00 21:08
20-03-2006 21:00 21:16
21-03-2006 21:00 21:13
22-03-2006 21:00 21:08
23-03-2006 21:00 21:12
24-03-2006 21:00 21:13
25-03-2006 21:00 21:19
26-03-2006 21:00 21:13

My attempts like

set terminal jpeg
#set timefmt "%d-%m-%Y"
#set xdata time
#set format x "%b %d"
set timefmt "%H:%M"
set ydata time
plot "time.dat" using 1:2:3 with errorbars
plot "time.dat" using 1:2:3 with errorlines

are not giving the right results.  Basically, trying to plot the run 
times of a job on a monthly basis.  Somehow got it into my head, that 
errorlines/bars are the way to go. If this is the wrong way, what's the 
corect method?

& is it possible to do time arithmetic in gnuplot?

regards,
Shanks

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Re: [Gnuplot-info] plot and splot with vectors

[<br...@ph...>]

Donald J Bindner wrote:
> vec.dat:
> 0 0 1 1

> I tried to plot it with:
> plot "vec.dat" w vec

> It works in my older version, but in the CVS pull, there is no
> arrow head.

Yep, that's a bug alright.  I'll investigate.

Re: [Gnuplot-info] plot and splot with vectors

[Donald J B. <dbi...@li...>]

On Sat, Mar 25, 2006 at 08:19:24AM -0600, Donald J Bindner wrote:
> Ok.  The vector.dem demo seems to work for me.  What I was doing
> was much simpler.
> 
> vec.dat:
> 0 0 1 1
> 
> I tried to plot it with:
> plot "vec.dat" w vec

To follow up on that post, the arrow heads are correct if I plot
something else along at the same time:

plot "vec.dat" w vec, 0

-- 
Don Bindner <dbi...@tr...>

Re: [Gnuplot-info] plot and splot with vectors

[Donald J B. <dbi...@li...>]

On Sat, Mar 25, 2006 at 01:47:41PM +0100, Hans-Bernhard Br?ker wrote:
> Without seeing the exact commands and a sample datafile that exhibit 
> that problem, it's hard to address that problem meaningfully.
> 
> Try starting out with the existing 'vector.dem' (which does work here), 
> and try if you can modify it to break.

Ok.  The vector.dem demo seems to work for me.  What I was doing
was much simpler.

vec.dat:
0 0 1 1

I tried to plot it with:
plot "vec.dat" w vec

It works in my older version, but in the CVS pull, there is no
arrow head.

-- 
Don Bindner <dbi...@tr...>

Re: [Gnuplot-info] plot and splot with vectors

[<br...@ph...>]

Donald J Bindner wrote:

> So today I downloaded the source for gnuplot from CVS and built
> it.  It does a beautiful job of printing my 3D vector fields.
> However, when I plot 2D data with plot, all of the arrows are
> missing their heads.  It would seem that either my vectors are
> being drawn with the line style by mistake or that the head style
> of the arrows is broken.

Without seeing the exact commands and a sample datafile that exhibit 
that problem, it's hard to address that problem meaningfully.

Try starting out with the existing 'vector.dem' (which does work here), 
and try if you can modify it to break.

[Gnuplot-info] plot and splot with vectors

[Donald J B. <dbi...@li...>]

I'm trying to plot some 2D and 3D vector fields for a calculus
class.  I have a Debian Sarge system with gnuplot 4.0 and it can
successfully do 2D plots from datafiles with vectors.  The same
binary prints only a + where the head of the vector would be when
I try to do something similar for 3D data using splot.

So today I downloaded the source for gnuplot from CVS and built
it.  It does a beautiful job of printing my 3D vector fields.
However, when I plot 2D data with plot, all of the arrows are
missing their heads.  It would seem that either my vectors are
being drawn with the line style by mistake or that the head style
of the arrows is broken.

Seems like a bug.

Other than that, I am delighted with my output.

Don

-- 
Don Bindner <dbi...@tr...>

[Gnuplot-info] Undeliverable Mail

[Postmaster <pos...@te...>]

No message body: in...@ma...


Original message follows.

Re: [Gnuplot-info] Problems installing from CVS

[<br...@ph...>]

Daniel Graupner wrote:
> Am Freitag 24 März 2006 15:34 schrieb Hans-Bernhard Bröker:
>> Daniel Graupner wrote:
>> This may be a good time to complain to the FreeBSD people about
>> installing obviously flawed automake macros into your system.
> 
> Well, automake is gnu automake19 from the ports tree...

Yes.  But those macros it warns about aren't part of automake itself. 
They're installed by other packages, and those apparently install 
versions that automake 1.9 objects to.  Ultimately, that's to be 
addressed among port maintainers.

Re: [Gnuplot-info] pm3d map, splotting doubts

[<br...@ph...>]

Adonai Herrera Martinez wrote:
> First.- I would like to assign the colours directly onto the integer 
> values (centred in the values: Z,A), extending to half a unit up and 
> down in both directions.

It's probably easier to just shift the data for Z and A by half a unit:

	splot 'data' u ($1-0.5):($2-0.5):3

With this shift and corners2colors, it should work.

> Second.- I would like to expand the x (A) axis in order to obtain square 
> pixels (not the rectangular ones I get now). That is to set a one-to-one 
> scale between both axis.

	set size ratio -1

Is supposed to do that.  I'm not 100% sure it works in 'map' mode, though.

> Three.- To force Gnuplot to create an output file (eps or png) which 
> holds the whole picture! (currently, my eps is cutting the right boundary).

> set term postscript landscape eps color 

I suggest you drop the 'landscape' out of that line.

> set xtics 10 set mytics 5 set mxtics 5 set grid xtics ytics # mxtics mytics

That line's broken.  There should be several semicolons in there.

Re: [Gnuplot-info] filledcurves in gnuplot 4,1 (beta)

[<br...@ph...>]

Danilo R. Velis wrote:
> Hi all!
> 
> I am using the gnuplot 4.1 (beta).
> 
> Is is possible to use the "with filledcurves" style
> using "steps" instead of "lines"?

No.  That'd be yet another new 'with' option, instead: "with 
filledsteps".  Failing that, you can always transform your data to 
introduce the steps.

Re: [Gnuplot-info] "yrange" help

[<br...@ph...>]

Kevin.McGrath wrote:
> I’d like the yrange from 0 to 10 to occupy ½ of the y axis and the 
> remainder to occupy the other half of the axis.

That'll take some serious trickery, and if you're using the new version 
4.1 'histogram' feature, it may be completely unfeasible.

Gnuplot generally doesn't handle transformed axes --- no breaks, no 1/x 
scaling, and no piecewise linear rescaling, nothing but linear and 
logrithmic scaling.  The main issue is that our tick placement algorithm 
isn't up to ticking arbitrarily deformed scales.  That means that if you 
  can come up with your own tick marks, you can do it:

gy(y) = (y < 10) ? y : (y - 10) / 90 * 10 + 10
set ytics (0,2,4,6,8,10, '20' 12, '40' 14, '60' 16, '80' 18, '100' 20)
plot 'data' u 1:(gy($2))

Re: [Gnuplot-info] axis limits adjustment

[<br...@ph...>]

fly away wrote:
> Hi all.
> I was wondering if there was a way to control axis limits adjustment. My
> problem is that I want to use automatic adjustment, since I don't know what
> the limits will be, but gnuplot seems to not like to do it smoothly. 

It does --- it just has a different idea of what "smooth" means than you 
do ;-)

Jest aside: the thing you're looking for is 'set autoscale xfix'