How to Save Multiple Figures in Loop?

Could you help me to save multiple plot/figure files using loop number?

My code is:

clear all;clc;
k=1:1:10

k = 1×10

1 2 3 4 5 6 7 8 9 10

for i=1:15
    x=i*sin(i*pi/4)*k;
    y=i*2*cos(i*pi/2)*k;
    plot(x,y)
    sprintf(gcf, '-dtiff', 'File%d_6.tiff',i);
end

Error using sprintf
Invalid format.

Answer 1

[Star Strider]

Perhaps this instead —

saveas(gcf, sprintf('File%02d_6.tiff',i), '-dtiff');

Specifing the numeric field as '%02d' creates a two-digit numeric field and pads single digits with a leading zero. That should make it easier to sort and recover the files.

See the documentation on saveas for more information.

.

[ercan duzgun]

Thank you very much @Star Strider

[Star Strider]

As always, my pleasure!

Answer 2

[Image Analyst]

You can use the newer exportgraphics in the loop:

clear all;
clc;
k = 1 : 10
for i = 1 : 15
    x = i * sin(i*pi/4) * k;
    y = i * 2 * cos(i*pi/2) * k;
    plot(x, y, 'b-', 'LineWidth', 2);
    grid on;
	drawnow;
    % Save current graph to its own file.
    fullFileName = fullfile(pwd, sprintf('Plot %2.2d.png', i));
    exportgraphics(gcf, fullFileName); % gcf to save the whole figure window, or gca to save only the graph.
end   
fprintf('Done!!\n')    

Be aware that your code just plots a series of lines, not sine or cosine curves since sin(i*pi/4) is just a single scalar, not a vector of 10 or 15 values, like perhaps you were expecting.

Use "hold on" after the plot if you want to show all the plot curves on the same graph.

You can also use subplot if you want all 10 plots on one figure window.

[ercan duzgun]

Dear @Image Analyst, thank you very much.