Indexing One Column from 4D Array?

Hi,

I'm trying to create a correlation coefficient between two variables of 716 elements. One of the variables (func) is a 84 x 84 x 52 x 716 array and I want to take the 716 elements from it. The other variable (seedts) is already formatted as 716x1.

When I run this code, I get an error using corrcoef that X and Y must have the same number of elements.

fcmap=zeros(1,84);
fcmap=fcmap.';

for pix = 1:size(fcmap,2)
    tmp=corrcoef(seedts,func)
    pixr=tmp(1:2);
    fcmap2(pix)=pixr
    if doFisherZ
        fcmap(pix)=(.5*long((1+pixr)/(1-pixr)));
    else
    end
end

Any suggestions for how to do this? Thanks!

[Luca Ferro]

i don't quite undersand the request.

''I want to take the 716 elements from it'' confuses me. Since you have a 4d matrix every single combination of values will have 716 elements.

This works, but it consider the 716 elements of only one combination.

corrcoef(seedts,func(1,1,1,1:end))

meaning that this one works as well:

corrcoef(seedts,func(1,1,2,1:end))

and so all the combination in the dimensions 84x84x52.

Do you want to loop through all of them or are you interested in one specific?

Answer 1

[Cris LaPierre]

one of the variables has 262708992 elements while the other has 716. You haven't specified which row, column, and page you want to extract the 'column' of 716 values from, but it might look something like this.

tmp=corrcoef(seedts,func(pix,pix,1,:));