Correlate through each matrix row

Hello,

I have the following matrix double_new_WB_prop = [12 74000]. What I want to do is;

1. Correlate a specific row with 3700 columns with another specific row with 3700 columns.
2. Repeat for all 12 rows.

% Correlate each row of a variable with rows of another variable
[rows,cols] = size(double_new_WB_prop);
ET_GWP = [];
for j = 1:rows
    ET_GWP = corr(double_new_WB_prop(j,1:3700), double_new_WB_prop(j,70301:74000));
end

My problem is that ET_GWP is returning all NAN (not suppose to return this). My code also shows no error.

I don't know where I'm going wrong and it would helpful if someone could point out what I'm doing wrong.

Thank you.

Answer 1

[Ameer Hamza]

Since you are trying to find the correlation between two one dimensional vectors, you should use corrcoef instead of corr.

Also, the value of ET_GWP is discarded in each iteration. One solution is to create a cell array to save all values.

% Correlate each row of a variable with rows of another variable
[rows,cols] = size(double_new_WB_prop);
ET_GWP = [];
for j = 1:rows
    ET_GWP{j} = corrcoef(double_new_WB_prop(j,1:3700), double_new_WB_prop(j,70301:74000)');
end