save figures in matlab during loop

Question

I am interested if it is possible to save figures which occurs during the loop.
For example, I have created some random matrix,

 r=rand(8,5)


r =

0.8147    0.9575    0.4218    0.6787    0.2769
0.9058    0.9649    0.9157    0.7577    0.0462
0.1270    0.1576    0.7922    0.7431    0.0971
0.9134    0.9706    0.9595    0.3922    0.8235
0.6324    0.9572    0.6557    0.6555    0.6948
0.0975    0.4854    0.0357    0.1712    0.3171
0.2785    0.8003    0.8491    0.7060    0.9502
0.5469    0.1419    0.9340    0.0318    0.0344

now if I use this line

plot(r(1,:))

I get following figure

enter image description here

My question is, if I use loop

for i=1:8
   plot(r(i,:))
end

it shows me one graph of row, but it odes not do cycle, so can I show all 8 figures step by step in matlab. For exmaple interval may be 10 seconds, for this as I know function movie is used, also getframe, or could I save figures in loop?
Also, I know that imsave or something like this. I think better would be save somewhere, so if I can use like this

imsave(plot(r(i,:))

score 5 · Accepted Answer · edited May 23 '17 at 12:18

5

use getframe to capture the content of the current figure handle

fh = figure
% ...
for ii = 1:8
    figure( fh ); % focus on figure
    plot( r(ii,:) );
    frm = getframe( fh );
    % save as png image
    imwrite( frm.cdata, sprintf( 'current_frame_%02d.png', ii ) );
end

PS
It is best not to use i as a variable in Matlab

edited May 23 '17 at 12:18

Community

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answered Apr 22 '13 at 08:13

Shai

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and where it writes?in folder in which this m file is right? – Apr 22 '13 at 08:15
It's writes to the output of `pwd`. – Roney Michael Apr 22 '13 at 08:17
@dato it writes the png images to your current working directory. – Shai Apr 22 '13 at 08:18
thanks friends,it was really helpful for me,now i am testing it – Apr 22 '13 at 08:18
it left 1 minute my friend,this site requires some minute before accept – Apr 22 '13 at 08:25

score 1 · Answer 2 · answered Apr 22 '13 at 08:15

I think that there are multiple solutions to your problem:

Use the pause function, which can make a pause so that you can look at your figure.
Print each image in a new figure. To achieve this, just put figure(i) in your for loop.
Or save the image using the print function.

Hope it helps!

score 1 · Answer 3 · answered Apr 22 '13 at 08:16

1

If you mean that you want to display all the plots by using a loop, you can do the following:

for ii=1:8
    figure();
    plot(r(ii,:));
end

answered Apr 22 '13 at 08:16

Roney Michael

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save figures in matlab during loop

3 Answers3