[scilab-Users] Re : [scilab-Users] Re : [scilab-Users] grayplot scaling

[Bouchra Bensiali]

Thank you, it works!

So if I summarize the different solutions :

- use of Sgrayplot with the zminmax option 
http://bugzilla.scilab.org/show_bug.cgi?id=4808#c1
- use of Matlab syntax with the caxis command and the "Matlab-like" Plotting 
library for Scilab http://atoms.scilab.org/toolboxes/plotlib/0.42 (doesn't work 
for me because I have problems when plotting graphics with scilab-5.2.2...)
- rescaling of data http://bugzilla.scilab.org/show_bug.cgi?id=4808#c3 (doesn't 
work for me, I surely missed something...)
- use of contourf with color levels

Thanks.


----- Message d'origine ----
De : Antoine Monmayrant <antoine.monmayrant at laas.fr>
À : users at lists.scilab.org
Envoyé le : Mar 9 novembre 2010, 9h 54min 44s
Objet : Re: [scilab-Users] Re : [scilab-Users] Re : [scilab-Users] grayplot 
scaling

Le 08/11/2010 21:55, Bouchra Bensiali a écrit :
> Hello and thank you for your answers.
>
> Yes, the context is to use a common color scale among several images, excuse 
it
> wasn't clear in my first message.
As promised yesterday, here is short example on how I do it using contourf:

///////////////////////////////////////////////////////////////////////////////////////////

y=linspace(-10,10,100);
x=linspace(-15,15,200)';

//two 2D maps with different max/min
z1=cos(x*y/10);
z2=0.5*cos(x*y/10);

//# of colors to use
n_color=128;
// max and min of the color scale
zmin=-1.1;
zmax=1.1;
// levels of the color scale
color_levels=linspace(zmin,zmax,n_color);


h=scf();
h.color_map=hotcolormap(n_color);
subplot(121)
contourf(x,y,z1,color_levels);
subplot(122)
contourf(x,y,z2,color_levels);
colorbar(zmin,zmax);
///////////////////////////////////////////////////////////////////////////////////////////


I know that colorbar is screwing my layout, but I usually don't use it.
I prefer plotting a dummy 1xn_color map with custom axis and layout.
Hope it helps,

Antoine


>   And another use would be for animation, as
> said in the bugzilla link, "zminmax option is important for animation to have 
a
> colorbar scale which is not changing from frame to frame".
>
> I tried the following:
> --
> x = linspace(0,1,101);
> z = cos(2*%pi*x)'*sin(2*%pi*x);
> zm = min(z); zM = max(z);
> xset("window",1)
> xset("colormap",jetcolormap(64))
> colorbar(zm,zM)
> grayplot(x,x,z)
>
> z2 = x'*x*0.4;
> xset("window",2)
> xset("colormap",jetcolormap(64))
> colorbar(zm,zM)
> grayplot(x,x,z2)
>
> e = gce(); m = e.data.z;
> e.data.z = zm+(m-min(m))/(max(m)-min(m))*(zM-zm);
> --
> but it doesn't work for me, am I doing something wrong?
>
> Thanks.
>
>
>
> ----- Message d'origine ----
> De : Samuel GOUGEON<Samuel.Gougeon at univ-lemans.fr>
> À : users at lists.scilab.org
> Envoyé le : Lun 8 novembre 2010, 19h 14min 13s
> Objet : [scilab-Users] Re : [scilab-Users] grayplot scaling
>
> ----- Message d'origine -----
> De : Stéphane Mottelet
> Date : 08/11/2010 18:23:
>> What is requested by Bouchra is as intuitive as wanting to change axis limits
>> to easily compare two plots. This feature (caxis stuff) is really missing in
>> Scilab graphics.
>>
>> S.
> For instance to use and share the same colorbar for several plots?
> Would the following be a work-around?
> http://bugzilla.scilab.org/show_bug.cgi?id=4808#c3
>
>
>
>


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  Antoine Monmayrant LAAS - CNRS
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