Trying to change name of image file in for loop - use %s?

Hi,

I'm trying to create a for loop, where I gather screen shots and save them (trial 1, trial 2..., etc.). I tried to use the following:

    imwrite(imageArray, '%s.jpg',trial)

to create different names for each image, as the loop continues. However, this didn't work. Is there any other way to do this, other than "if trial 1....else if trial 2, etc.?"

I am using PTB, if that's useful.

Thank you!

Answer 1

[Sean de Wolski]

Use the filename as the following

for ii = 1:10
   filename = ['trial' num2str(ii) '.jpg']
   imwrite(I,filename)
end

It looks like what you were trying to do was use sprintf inside of imwrite. This would work too, but it a little more power than you need:

filename = sprintf('trial%i.jpg',ii)

[Chelsea]

Yep - thanks! :)

Answer 2

[Image Analyst]

Read this part of the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F Then read the rest of it too, because there is lots of good stuff in there.