algorithm - I want replace the values of 1 in an adjacency matrix with weights given in another smaller matrix -


how can replace values of 1 in adjacency matrix weights given in matrix? example:

adjacent_matrix = [1 0 0 1; 0 0 1 1; 1 0 1 0; 0 1 1 0 ] weight_matrix = [ 2 4 6 2; 4 5 1 3]

the final matrix should this: [2 0 0 4; 0 0 6 2; 4 0 5 0; 0 1 3 0]

accumarray solution:

>> [ii,jj] = find(adjacent_matrix.'); >> out = accumarray([ii jj],reshape(weight_matrix.',[],1)).' out =      2     0     0     4      0     0     6     2      4     0     5     0      0     1     3     0

sparse solution:

[ii,jj] = find(adjacent_matrix.'); out = full(sparse(ii,jj,weight_matrix.')).'

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