How to print index number when ploting figures from functions

Hello everyone!

I have written the next piece of code that calls a funtions and saves the 4 figures that are created from that function for every image in a folder but the images are overwritten because i cant index the images inside the function.

This is my code :

folder = 'C:\Users\lena\Desktop';

outLoopValues = [1,2];
for k = 1 : length(outLoopValues)
	index = outLoopValues(k);
    
        thisBaseFileName = sprintf('%d.png', index);
		thisFileName = fullfile(folder, thisBaseFileName);
		images{index} = imread(sprintf('%d.png', index));
        [f1, f2, f3, f4] = an_function(images{index})
end

So an_function takes my images as inputs and makes the 4 figures as outpouts but i dont know how to change the name inside each one of the figures in the function so that it is saved lets say with f1image_index1 for the first index and f1image_index2 for the second index

[Jan]

Just a note: You create the file name with the folder as thisFileName, wo why don't you use it?

What about providing k or index as further input to the function an_function? Or you can set the names of the figures afterwards:

set(f1, 'Name', sprintf('f%dimage_%d', k, index), 'NumberTitle', 'off'))
... and so on

[Adam Danz]

To add to @Jan's advice, if you want to avoid overwriting the files if you run the function again on the same set of data, you could add a datetime stamp to the filenames.

timenow = datetime('now','format','yyMMddHHmmss');
sprintf('f%dimage_%d_%s', k, index, timenow)