Use of corrcoef function

Hello all,

I might be asking an arbitrary one today.

I am trying to familiarise myself to the use of corrcoef function so here it goes: Assume N is a given matrix and X & Y correspond to different columns (N(:,1) and N(:,2) in that array:

I'm struggling to understand what corrcoef (x y) and corrcoef(N) result to.

The code (an extract) i use for corrcoef (x y) is below:

for i=2:SampleLength; 
    for j=2:SampleLength; 
  X=N([a:b],i);  %a , b define specific boundaries
  Y=N([a:b],j)
[Correlation,Significance]=corrcoef(X,Y);
test(i-1,j-1)=Correlation(2,1);
sign(i-1,j-1)=Significance(2,1);
end
end

This extracts the coefficients and p-values.

But in the same time i can just run :

[Correlation,Significance]=corrcoef(N)

but end up with a different correlation matrix.

Any input on this?

Thanks in advance

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/matlab/ref/corrcoef.html