Control figure title, size and position in for loop

Hi all,

I want to express the changing Gaussian beam along the z values.

There is a for loop with pause() function for the animation.

The figure is changed with each loop.

But there are two problems.

1. How to add the title of the whole figure, not subtitles?

2. As soon as I execute the code, the figure frame is created that I intended, but instantly, the figure size is changed to small, and it is placed at not intended position.

Here is the code.

clc; clear all; close alll;

DataSet = zeros(1200,1600,30);
x = linspace(-30,30,1600);
y = linspace(-30,30,1200);
z = linspace(100,10000000,30);
[X Y] = meshgrid(x,y);

lambda = 532*10^(-6);
w0 = 16;
wz = w0*sqrt(1+(lambda*z/(pi*w0^2)).^2);
I0 = 1;

FigH = figure;
set(FigH,'Position',[1000 0 600 900])

for k = 1:5:30
    printf('position z: %d / %d \n',z(k),max(z))
    DataSet(:,:,k) = I0*(w0/wz(k))^2*exp(-2*(X.^2+Y.^2)/(wz(k)^2));
        
    subplot(3,2,1)
    p1 = imagesc(x,y,DataSet(:,:,k));
    colormap jet
    axis equal
    title('Subplot 1')
    
    subplot(3,2,2)
    p2 = imagesc(x,y,DataSet(:,:,k));
    colormap jet
    axis equal
    title('Subplot 2')
    
    subplot(3,2,3)
    p3 = imagesc(x,y,DataSet(:,:,k));
    colormap jet
    axis equal
    title('Subplot 3')
    
    subplot(3,2,4)
    p4 = imagesc(x,y,DataSet(:,:,k));
    colormap jet
    axis equal
    title('Subplot 4')
    
    subplot(3,2,5)
    p5 = imagesc(x,y,DataSet(:,:,k));
    colormap jet
    axis equal
    title('Subplot 5')
    
    subplot(3,2,6)
    p6 = imagesc(x,y,DataSet(:,:,k));
    colormap jet 
    axis equal
    title('Subplot 6')
    
    pause(0.00000001)
end

Any ideas? Thx in advance. ;-)

[dpb]

I don't see any such behavior, the figure size remains as is. I did remove the printf line since it doesn't provide anything useful nor is there actually a builtin MATLAB function of that name; I presume it is a typo for frpintf.

R2020b, Win10

[Rik]

@dpb As you can see in the icon, this is GNU Octave. There is a function with the name printf, which (if I recall correctly) has slightly different behavior from fprintf.

@태신 김 There is no problem asking a question about Octave here, but you need to make sure the behavior is reproducible in Matlab as well (even if it is an old release). In my experience, the OS matters a lot. I don't know if the suptitle function is implemented in Octave, but you can fairly easily create a rudimentary version yourself.

[태신 김]

Thank you for your advice.

[Walter Roberson]

"There is no problem asking a question about Octave here"

This is a MATLAB / Mathworks forum, Octave is off-topic here, and any question which is specific to Octave may be closed as being irrelevant to MATLAB Answers.

Reminder: the purpose of Octave, the reason it exists, is to try to force Mathworks to either open-source its software... or to shut down the company. Either possibility would be considered a success for the Free Software Foundation.

The Free Software Foundation does not exist to provide high-quality affordable software to people who might otherwise not be able to afford it. The Free Software Foundation is a political entity whose purpose is to try to force the end of proprietary software, and its production of open-source software is a tactic rather than an end of its own.

Answer 1

[Mathieu NOE]

hello

see my suggestion below . I didn't have the problem of figure resizing, but I don't understand why you plot 6 times exactly the same data . I guessed that the 6 subplots should correspond to the 6 iteration steps , so I modified a bit your code to reflect that

for the main title, I used the info available here : How can I insert a title over a group of subplots? - (mathworks.com)

My result at the end of the for loop

clc; clear all; close all;
DataSet = zeros(1200,1600,30);
x = linspace(-30,30,1600);
y = linspace(-30,30,1200);
z = linspace(100,10000000,30);
[X Y] = meshgrid(x,y);
lambda = 532*10^(-6);
w0 = 16;
wz = w0*sqrt(1+(lambda*z/(pi*w0^2)).^2);
I0 = 1;
FigH = figure;
set(FigH,'Position',[1000 0 600 900])

sgtitle('Subplot Grid Title') % create main title 
% see : https://fr.mathworks.com/matlabcentral/answers/100459-how-can-i-insert-a-title-over-a-group-of-subplots

for ci = 1:6
    k = 1+5*(ci-1);
    sprintf('position z: %d / %d \n',z(k),max(z))
    DataSet = I0*(w0/wz(k))^2*exp(-2*(X.^2+Y.^2)/(wz(k)^2));
        
    subplot(3,2,ci)
    p1 = imagesc(x,y,DataSet);
    colormap jet
    axis equal
    title(['Subplot ' num2str(ci)])
    
    pause(0.25)
end

[태신 김]

Thank you for your suggestion.

I know your intention, but it is out of my question range.

Of course, I intended to fill other various plots in each subplot.

I just wondered what shall I do to solve the problems what I refered.

Anyway, thank you for your solution about my questions.

(But Octave doesn't recognize sgtitle().)

Thanks.