Save sparse matrix as row, column, and value vectors

问题

I have a sparse matrix saved in a mat file. I want to process it in C++ but my library expects the sparse matrix to be represented as three vectors: colIdx (vector of indices of nonzero columns), rowIdx (vector of indices of nonzero rows), and val (vector of values).

How should I go about this? Are there any built-in commands doing similar operations?

回答1:

find is what you are looking for

[rowIdx colIdx val] = find( myHugeSparseMatrix );

来源：https://stackoverflow.com/questions/32177489/save-sparse-matrix-as-row-column-and-value-vectors