How to add a string to a filename while saving plots

I have a code that runs a for loop through a folder, reads the files, plots certain variables for each file and saves the plot as a png with the filename.

[pathstr,name,ext] = fileparts(file.name); print('-dpng',name,'d');

e.g: For a file called test the plot is saved as test.png

Now I want to plot multiple graphs for the same file and hence save the file as test_angle.png for example.

Any idea how I can do that? In python I can do so using '+'. I tried using strcat and append but I think I am doing something wrong.

Answer 1

[Stephen23]

Use sprintf and fullfile. You will find a complete explanation here:

https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files

[Manal Shakeel]

I don't want to add a variable to the filename. I know that can be done by iterating over the files. I want a fixed string to be added to each plot's filename. for files testa, testb, testc and so on, I would like testa_angle.png, testb_angle.png.....

[Stephen23]

@Manal Shakeel: like I said, use sprintf:

sprintf('%s_angle%s',name,ext)

or perhaps:

sprintf('%s_%s_angle%s',name,'a',ext)

and I am sure you can figure out how to put that into a loop.

[Manal Shakeel]

Thanks!

Answer 2

[Thorsten]

name = 'test';

Either

newname = [name, '_angle'];

or

newname = strcat(name, '_angle');

or, as Stephen suggested, using sprintf

newname = sprintf('%s_angle', name);