MATLAB: Standart deviation between two matrix

standart deviation...

Hi,

I have a matrix A 100*6 and and a matrix B 100*1.

I would like to compute de standart deviation between each columns of Matrix A with the matrix B.

Thank you

What do you mean "between two matrix"

std() on a matrix returns the standard deviation of the columns

A = randn(100,6);
std(A)
B = randn(100,1);
std(B)

The row means would be calculated as the mean of dimension 2.

Try this:

A = rand(5);
Anew = A - mean(A,2);
Check = mean(Anew,2)                    % Confirm: Mean = 0

Let's say your time variable is

time = 0:.1:10;

and your data is named 'data'.

First locate all time samples between 0 and 3 sec

idx = time >= 0 & time <= 3;

Then calculate std of your data for those times.

sig = std(data(idx));

This can be done all in 1 line like this

sig = std(data(time >= 0 & time <= 3));

*This assumes your 'time' and 'data' points correspond.