Brainstorm: Re-order NxN connectivity matrix

reorder_conn_nxn.m

% Export NxN connectivity node in tree as Matlab variable "connMat" 
connMatNew = connMat;
nameRows = connMat.RowNames;
nameCols = connMat.RefRowNames;
if ~isequal(nameRows, nameCols)
    error('Names for rows and columns MUST be the same')
end
nRows = length(nameRows);

% Expand connectivity matrix
connR = process_compress_sym('Expand', connMat.TF, nRows);
connR = reshape(connR, nRows, nRows);
connRNew = 0 * connR;

% New order (randowm for example)
rng(111);
ixsNew = randperm(nRows);

% Re-order
nameRowsNew = nameRows(ixsNew);
ixsCols = repmat(ixsNew, 1, nRows);
ixsRows = repelem(ixsNew, 1, nRows);
connRNew(:) = connR(sub2ind(size(connR), ixsRows, ixsCols));

% Update fields 
connMatNew.RowNames = nameRowsNew;
connMatNew.RefRowNames = nameRowsNew;
connMatNew.TF = process_compress_sym('Compress', connRNew(:));

% Import the variable "connMatNew" to the NxN connectivity node in tree