mtx_index
mtx_index addresses matrix elements by their indices, allowing multiple known elements to be selected simultaneously; its output matrix has the same shape as the indexing matrix. Index 0 is invalid, so a creation argument can specify the replacement value for invalid indices, as in mtx_index nan.
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Pdand go toToolsFind Externals. Search foriemmatrixand install it. Then create an object withdeclare -lib iemmatrix -path iemmatrix. Finally, usemtx_indexor any other object fromiemmatrix.