how to process the data in a series of files under different folders?

I have a set of files called "p" under the folder of "surface->0.1 (folder named by time steps)->patchgorund->scalarField". As you can see in the attachment, in the file "p" there are 400 data inside bracket. Now I have to change those data by minus a number, for example, p-1000. Then repeat this procedure for each folder (0.1, 0.2, 0.3.....->patchgorund->scalarField->p). Do you have any ideas?

[kimy]

anybody has ideas?

[Stephen23]

Duplicate:

https://www.mathworks.com/matlabcentral/answers/1438974-how-to-process-the-data-in-a-file-and-repeat-the-procedure-for-different-folders