How to calculate random Correlation Pairs

Hello everyone!

I'm working with resting-state fMRI data and I want to calculate the correlation, with corrcoef, between each pair of voxels one by one, using 2 input arguments (R = corrcoef(A,B)). My question is this: I know how to compare a specific voxel with the rest but I'm struggling in how to compare the correlation between random (or all the combinations possible) voxels.

Can somebody give me a hand on this?

Thanks in advance,

Hugo

Answer 1

[Jeff Miller]

Make a matrix A with one column for each voxel, and then use

cormatrix = corrcoef(A)

The output will be the correlations for all pairs of voxels.

[Iugo]

Thanks for the ideia!

But I really wanted to calculate the correlation with corrcoef between 2 input arguments (vectors and the time series).