how to do this Data analysis?

I am having 5 .mat files. Each mat file contains 5 parameters. A,B,C,D,E

Now I want to plat a graph which will be considering all mat files.

I want to take C variable which is of a size 200x1 from each mat file, take mean of it for that mat file and then plot it against time.

So at the end I will get a graph with 5 points representing mean of the respective C columns from .mat file.

Can anyone help me to do this?

Here is what I have done till now:

clear all; clc;

myFolder = 'C:\Users\adi\Documents\MATLAB\';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.mat');
matFiles = dir(filePattern);
for k = 1:length(matFiles)

end

This is reading the files from my folder. Now Please help me to analyze them!

Answer 1

[Thorsten]

In the body of your for loop, write

 load(matFiles(k).name)
 plot(k, mean(C), '.')
 if k == 1, hold on, end

[adi kul]

Thank you for quick reply. But it's giving me

Subscript indices must either be real positive integers or logicals.

error!

[adi kul]

what will be the reason?

[Thorsten]

My fault. Must be matFiles(k) instead of matFiles(i). I corrected the original post.

[adi kul]

Now it's giving

Error using load
Argument must contain a string.

[Thorsten]

Sorry, must be matFiles(k).name, as corrected above.

[adi kul]

I figured it out but now it's giving

Error using load
Unable to read file
'Trial1.mat':
no such file or directory.

The 5 files are Trial1.mat, ....., Trial5.mat

[Thorsten]

Does

 >> dir

show you Trial1.mat, Trial2.mat etc? If not, you have to move these files to your current directory, or change your current directory to a location where these files are stored.

If yes, you probably have NO read access to the files. You have to add read permission to your files

Unix/Linux/MacOS: 
system('chmod u+r Trial*.mat')

Windows:
system("CACLS Trial*.mat /e /p yourlogin:r")

[adi kul]

Thanks! I misplaced my directories!

Answer 2

[Image Analyst]

This question is asked daily. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F Use the code snippets to loop over files. At the center of the loop, call load(), hold on, and plot().