save matrix in loop to 3D matrix (storage all inkomming matrix)

Hello,

I read multiple .mat-files with matrix M x-y-axis (5x2doubles) and have to save it. I think, the better way is to create a 3D-matrix - z-axis. Later, i have to make mean and std trow all z-axis elements. How can i do it?

Please think about - i get a matrix M in the loop, by load(MAT_File)

Thank you in advise!

Answer 1

[madhan ravi]

 M = cell(n, 1); % n - number of files
 for k = 1:n
     M{k} = load(filenames{k}); % assuming you saved filenames in a cell array
 end
 M = cat(3, M{:});
 MEAN = mean(M, 3)

[Nik Rocky]

Great, thank you!

[Nik Rocky]

MEAN = mean(M_test, 3);% Perfect! 
STD = std(M_test, 3);% Error

why?

Error using var (line 179)
W must be a vector of nonnegative weights, or a scalar 0 or 1.

Error in std (line 51)
y = sqrt(var(varargin{:}));

Error in Plot_ROC_03_07_20 (line 120)
STD = std(M_test, 3);

[Nik Rocky]

Of course of this difference?

S = std(A,w,dim)

M = mean(A,dim)

[Nik Rocky]

MEAN = mean(M_test, 3);

STD = std(M_test,0, 3);

Success =)