Export the mat file from phase lock value connectivity

[Raymundo.Cassani]

Since PLV is a symmetric connectivity metric, only the lower triangle (which includes the diagonal) is saved. See:

Visualize Connectivity matrix using imagesc

Hi @sugata_hisato, The connectivity matrix (TF field) is saved as: [Nr x Ntime x Nfreq]. Nr represents the connectivity between two files, thus Na x Nb. However, the relation between Na x Nb and Nr may not be direct as it's optimized to save storage space for some connectivity metrics. https://neuroimage.usc.edu/brainstorm/Tutorials/Connectivity#On_the_hard_drive E.g. in correlation, as corr(a,b) == corr(b,a) only one value is saved. In your case 271*271 = 73441 elements; then the upper tr…

To recover the NxN matrix, use:

R = bst_memory('GetConnectMatrix', TfMat);

See more details in this section of the connectivity tutorial page:
https://neuroimage.usc.edu/brainstorm/Tutorials/Connectivity#On_the_hard_drive