gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] keep ratio for all axis, axis in same place

[Lars H. <la...@ho...>]

Hi!

> a) I am using splot command to paint some figures. I
> would like that gnuplot autoscale (ok, done by default)
> but I would like that gnuplot keeps the ratio for all
> axis. Example: if gnuplot decides that x-axis has to be
> from -6 to -6, I want that y-axis is from -6 to 6 and
> z-axis too. Else my figures gets with "rare" shapes

The simpest way to do this would of course be to choose the 
ranges by hand. You may use a variable within the set 
[xyz]range-command. Maybe your mathematical equations or 
yoour data allows to calcutlate good borders.

As far as I could find out by studying the documentation, 
there is no way of telling gnuplot to keep an aspect ratio 
in 3D-plots. I had a kind of "brute force"-idea that might 
work, but I've not tested it yet. Let's say your x-range is 
choosen quite qell. So your aim is to set the y- and z-axis 
to the same ranges. I would first set the terminal to 
unkown, so that no output is created. Then I would do a 
coordinate transformation that changes x with y (resp x 
with z). If I would now plot the graph, the y-axis (z-axis) 
should have the right range. Before that I use the 
mechanism of writing back the automatically calulated 
ranges:
  set yrange [] writeback
By doing this, gnuplot writes the now well calculated values 
for the upper and lower border of y to a memory. Afterwards 
I would reset the terminal to the one I would like to use 
for my output. If you now use 
  set yrange [] nowriteback
gnuplot should (If I am right) not change the ranges for y.


> b) I want that x-axis, z-axis and y-axis are always
> represented in z=0, x=0 and y=0. Any way to do it? z-axis
> sometimes is represented in -6, is a bit confusing :-)

Your problem cant't be solved completely, since gnuplot does 
not allow to move the z-markers from the border to the 
axes. The nearest solution would be like follows

  set ticslevel 0   # puts z=0 to x=0,y=0
  set zeroaxis linetype 1 # produces lines on the axes x,y
  unset border # switches off the frame around the plot
  set xtics axis nomirror
  set ytics axis nomirror # puts the tics to the axes x,y

You may "simulate" an z-axis by using the set arrow command, 
but you can't move the z-tics to this line. 


HTH
Lars

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Re: [Gnuplot-info] keep ratio for all axis, axis in same place

[Carles P. i E. <ca...@pi...>]

Hi,

On Jan/20/2007, Carles Pina i Estany wrote:

> I am searching and I don't find two minor things:
> a) I am using splot command to paint some figures. I would like that
> gnuplot autoscale (ok, done by default) but I would like that gnuplot
> keeps the ratio for all axis. Example: if gnuplot decides that x-axis
> has to be from -6 to -6, I want that y-axis is from -6 to 6 and z-axis

it seems that, for plot, there is set size square, etc. but not for
splot. Any clue?


-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

[Gnuplot-info] keep ratio for all axis, axis in same place

[Carles P. i E. <ca...@pi...>]

Hello,

I am searching and I don't find two minor things:
a) I am using splot command to paint some figures. I would like that
gnuplot autoscale (ok, done by default) but I would like that gnuplot
keeps the ratio for all axis. Example: if gnuplot decides that x-axis
has to be from -6 to -6, I want that y-axis is from -6 to 6 and z-axis
too. Else my figures gets with "rare" shapes

b) I want that x-axis, z-axis and y-axis are always represented in z=0,
x=0 and y=0. Any way to do it? z-axis sometimes is represented in -6, is
a bit confusing :-)

Thanks!

-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

Re: [Gnuplot-info] Cone in parametric :-)

[Carles P. i E. <ca...@pi...>]

Hi,

On Jan/18/2007, Hans-Bernhard Br=F6ker wrote:

> >I am trying to do the figures that I need using parametric coordinate.=
=20
>=20
> You're confusing things here.  There's no such thing as "parametric=20
> coordinates".  Parametric is a model for describing surfaces, not a=20

correct, I was confusing it. My blame

> coordinate system.  Gnuplot does parametric plots in a cartesian=20
> coordinate system.  A simple cylinder is
>=20
> 	set parametric
> 	set urange [0:2*pi]; set vrange [-2:2]
> 	splot cos(u), sin(u), v title "cylinder"

iep, it works (of course). Now I can do my figures in two ways :-)
Thanks!

> >Any idea? the formula seems correct, Maybe range problem for u and v?
>=20
> Quite certainly, since you didn't specify any ranges for u and v.=20
> Please do read the documentation: "help parametric".

I was in hurry and I miss-understood, now is fine!

Sorry for the stupid mistakes: error with u and v in some formula,
divide two integers and expect a float and this...

--=20
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

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Re: [Gnuplot-info] Cone in parametric :-)

[<HBB...@t-...>]

Carles Pina i Estany wrote:
> Hello,
> 
> I am not able to plot cylinder using cartesian system (I think that is
> not possible in gnuplot?)

You think incorrectly.

> I am trying to do the figures that I need using parametric coordinate. 

You're confusing things here.  There's no such thing as "parametric 
coordinates".  Parametric is a model for describing surfaces, not a 
coordinate system.  Gnuplot does parametric plots in a cartesian 
coordinate system.  A simple cylinder is

	set parametric
	set urange [0:2*pi]; set vrange [-2:2]
	splot cos(u), sin(u), v title "cylinder"


> Any idea? the formula seems correct, Maybe range problem for u and v?

Quite certainly, since you didn't specify any ranges for u and v. 
Please do read the documentation: "help parametric".

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[Gnuplot-info] Cone in parametric :-)

[Carles P. i E. <ca...@pi...>]

Hello,

I am not able to plot cylinder using cartesian system (I think that is
not possible in gnuplot?)

I am trying to do the figures that I need using parametric coordinate. I
have done without problemes sphere, cylinder but I need cone. 

Here for example:
http://mathworld.wolfram.com/Cone.html

There is the parametric equations (equations number 1, 2 and 3). 

I do in gnuplot:
set parametric
set isosample 51
set ticslevel 0
h=2.0
r=1.0
splot ((h-u)/h)*r*cos(u), ((h-u)/h)*r*sin(u),v
pause -1

And something appears but doesn't look as a cone :-)

Any idea? the formula seems correct, Maybe range problem for u and v?

Thank you very much,

-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

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Re: [Gnuplot-info] 3D figures in coordinate system

[<HBB...@t-...>]

Carles Pina i Estany wrote:

> sphere(x,y)=(1-x**3-y**3)**(1/3)

The (1/3) thing is your biggest problem.  Read "help expression" to 
understand why

   sphere(x,y)=(1-x**3-y**3)**(1.0/3)

works better.

> Usually it is difficult to adjust the position of each figure
> appropriately. There is no easy way to determine the values of  origin ,
> and you have to do it by "trial-and-error".

The most important clue you need here is "help parametric"

[Gnuplot-info] cilinder

[Carles P. i E. <ca...@pi...>]

Hi,

Now I can plot sphere using cartesian system, but I need cylinder too
(and this is the last figure that I have problems :-)   )

Ok, cylinder in cartesian system is:
x**2 + y**2 = R

Of course, I have tried:
cilindre(x,y)=x**2+y**2-1.0
splot cilindre(x,y)
pause -1

But doesn't work (normally!). I had the cylinder in:
---------
set mapping cylindrical
set parametric
set isosample 20
R1=2
desplx1=0
desply1=0
splot R1*cos(u)+desplx1,R1*sin(u)+desply1,v
---------
But I need in cartesian system to plot cylinder and other figures in
same graphic. 

Any idea to have the cylinder in cartesian system and not parametric?

Thank you very much!

-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

[Gnuplot-info] =?gb2312?B?QVJNOS9MaW51eC9XaW5kb3dzQ0XF4NG10MXPoiEg?=

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[Gnuplot-info] 3D figures in coordinate system

[Carles P. i E. <ca...@pi...>]

Hello,

I need to paint some figures (sphere, cone, hyperboloide, cylinder)
using gnuplot.

I have done all of them but I need to plot in the same output (PNG, for
example). So, I think that I need to use the same coordinate system,
else I need to use set multiplot and unset multiplot and I have too much
problems with the point of view, scale, etc. etc.

I have tried to paint, for example, a sphere, using cartesian system (I
can do it with sphericals, but then I will have problems with other
figures :-) ):
-------------
set isosample 36,18
set ticslevel 0
set size 0.65,1.0

sphere(x,y)=(1-x**3-y**3)**(1/3)
splot sphere(x,y)
pause -1
-------------
Why is not working? What thing from gnuplot I am missing?

I don't want to use multiplot and plot figures with differnt
coordinates, for example this web page:
http://t16web.lanl.gov/Kawano/gnuplot/plot3-e.html
says:
Usually it is difficult to adjust the position of each figure
appropriately. There is no easy way to determine the values of  origin ,
and you have to do it by "trial-and-error".

And gnuplot input is something personalized for users of application, so
I cannot do "try and error" there :-)

thank you very much,

-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

[Gnuplot-info] =?utf-8?b?5YWN6LS55LiL6L29ZmlyZWZveCjngavni5Ap5rWP?= =?utf-8?b?6KeI5ZmoZ251cGxvdC1pbmZv?=

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[Gnuplot-info] =?gb2312?B?QVJNOS9MaW51eC9XaW5kb3dzQ0XF4NG10MXPoiEg?=

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Re: [Gnuplot-info] Problem printing the legends in the multiplot graph

[<HBB...@t-...>]

Aniket Sane wrote:

> 	I am using "set key below" to achieve the same. But then the legends
> are getting printed repetitively. Suppose I have a multiplot graph with
> three legends, then the first legend is getting printed thrice, second
> twice and the last one is getting printed once. 

That would only happen if you use multiplot for entirely the wrong 
purpose, and also use 'replot' to make things even worse.

What you really should be doing will more similar to

	plot 'file1', \
              'file2', \
              'file3'

No multiplot, no replot.

Re: [Gnuplot-info] (no subject)

[<HBB...@t-...>]

jz...@co... wrote:
> I have gnuplot  Version 3.7 in my linux machine. From the gnuplot
> start screen, it tells me:

> Would you tell me how I can upgrade it from gnuplot3.7 to gnuplot4.0
>   for this machine? 

Whichever way your Linux distribution does such things; or by compiling 
your own gnuplot.

Re: [Gnuplot-info] question: is there a memory limit?

[<HBB...@t-...>]

M L wrote:
> I am wondering if there is a memory limit using gnuplot to plot a large 
> number of data (2D time series with a few million points)?

No.  As the saying goes, the sky's the limit.  That said, the practical 
limit is that a plot of such a time series will be quite completely 
unreadable, regardless of whether gnuplot can make one or not.  Consider 
that your entire computer screen only corresponds to a few Megabyte of 
data --- how is that going to manage to hold the information from a few 
million floating-point numbers and still leave you with something you 
can visually decode?

Re: [Gnuplot-info] limitation in 'plot with lines' ?

[<HBB...@t-...>]

Bernd Gassmann wrote:
>    Using a file "data" with 2 columns and 65532 lines of
>    numbers the command
> 
>    gnuplot>  plot "data" using 1:2 title "TST" with lines
> 
>    does not plot the point on the last data line.

On what platform, using which output terminal driver?

> Is this a known limitation or did I make anything wrong
> during the installation procedure or ...?

No, and probably no, in that order.

[Gnuplot-info] limitation in 'plot with lines' ?

[Bernd G. <Ber...@ma...>]

Dear gnuplot team.

I've installed gnuplot 4.0 over version 3.7 and it seems
for me that it does not work correctly.

I've cut the problem down:
   Using a file "data" with 2 columns and 65532 lines of
   numbers the command

   gnuplot>  plot "data" using 1:2 title "TST" with lines

   does not plot the point on the last data line.

Without the  'with lines'  directive:
   gnuplot>  plot "data" using 1:2 title "TST"
it can plot it.

A datafile with one line less (i.e. 65531) is plotted
correctly.

With version 3.7 both commands worked as expected.

Is this a known limitation or did I make anything wrong
during the installation procedure or ...?

Thank you

Bernd