statistics

how to write a script to calculate means and standard deviations for each columns and use these values in such way to subtract mean of column from each element of column then divide the outcome by standard deviation of column. Repeat that for each column .Then from new matrix to pick maximum element out of each column.

[Walter Roberson]

You do not need a loop for any of that. What you do need is to search the MATLAB documentation to find functions to calculate mean and standard deviation.

Answer 1

[Adam Danz]

Here's an example using fake data named 'data'.

% Fake data
data = randi(9,20,5); 

% Calculate mean and std for each column
means = mean(data,1); 
sd = std(data, [], 1); 

% Subtract mean and divide by std
dataNorm = (data - means) ./ sd; 

% Max element from each column
dataNormMax = max(dataNorm, [], 1);

Here's the same thing all in 1 line.

dataNormMax  = max((data - mean(data,1)) ./ std(data, [], 1), [], 1);

Answer 2

[Darshan]

% Fake data
data = randi(9,20,5); 
% Calculate mean and std for each column
means = mean(data,1); 
sd = std(data, [], 1); 
% Subtract mean and divide by std
dataNorm = (data - means) ./ sd; 
% Max element from each column
dataNormMax = max(dataNorm, [], 1);