Re: problem with plotting graphic

[c.]

On 9 Jul 2013, at 10:59, Mehdi Daakir <address@hidden> wrote:

> Hi,
> 
> I'm a student and using octave for my tests and plotting.
> I have this problem while plotting a figure When I force the intervalle of 
> scale, Octave don't put the number '0' but a '5....e-17' in the graphic.
> 
> here is an example of the code for plotting :
> figure(1)
> subplot(221)
>       hold on
>       plot(x_img1_c1*1e6-mean(x_img1_c1)*1e6)
>       title("coord i spot 1")
>       ylabel("Ecart a la moyenne en um")
>       set(gca,'ylim',[-1 1],'ytick',-1:0.1:1)
>       hold off
> 
> 
> I don't know how can I fix this problem.

You can  make sure the your ytick includes the exact value 0:

 t = [linspace(-1, 0, 11) linspace(0.1, 1, 10)];
 set(gca,'ylim',[-1 1],'ytick', t);

or manually change the labels on the y axis by setting the property 
'yticklabel':
 
  set(gca, 'yticklabel', {'-1', '-.9', … ,  '0', '0.1', … , '1'});


> It's not convinent for the professionnal graphics to have this value instead 
> of 0. Here is an exemple in the file attached of the result.

If you need more "professional" looking grafics try having a look at 
http://home.gna.org/veusz/
I often use it for my publications saving data from Octave and then importing 
in veusz.

> Thank you for your help.
> 
> Best regards,
> 
> Mehdi


HTH,
c.