gf_spmat_set

Purpose

Modification of the content of a getfem sparse matrix.

Synopsis

gf_spmat_set(M,'clear'[, I[, J]])
gf_spmat_set(M,'scale', V)
gf_spmat_set(M,'transpose')
gf_spmat_set(M,'conjugate')
gf_spmat_set(M,'transconj')
gf_spmat_set(M,'to_csc')
gf_spmat_set(M,'to_wsc')
gf_spmat_set(M,'to_complex')
gf_spmat_set(M,'diag', mat D [, ivec E])
gf_spmat_set(M,'assign', ivec I, ivec J, V)gf_spmat_set(M,'add', I, J, V)

Description

gf_spmat_set(M,'clear'[, I[, J]]) : erase the non-zero entries of the matrix. The optional arguments I and J may be specified to clear a sub-matrix instead of the entire matrix.

gf_spmat_set(M,'scale', V) : multiplie the matrix by a scalar value V.

gf_spmat_set(M,'transpose') : transposition of the matrix.

gf_spmat_set(M,'conjugate') : conjugate each element of the matrix (does nothing for REAL matrices).

gf_spmat_set(M,'transconj') : transpose and conjugate the matrix.

gf_spmat_set(M,'to_csc') : convert the matrix to CSC storage. CSC storage is recommended for the speed of matrix-vector multiplications.

gf_spmat_set(M,'to_wsc') : convert the matrix to WSC storage. Read and write operation are quite fast with WSC storage.

gf_spmat_set(M,'to_complex') : store complex numbers.

gf_spmat_set(M,'diag', mat D [, ivec E]) : change the diagonal (or sub-diagonals) of the matrix. If E is given, D might be a matrix and each column of E will contain the sub-diagonal number that will be filled with the corresponding column of D.

gf_spmat_set(M,'assign', ivec I, ivec J, V) : copy V into the sub-matrix M(I,J). V might be a sparse matrix or a full matrix.

gf_spmat_set(M,'add', I, J, V) : add V to the sub-matrix M(I,J). V might be a sparse matrix or a full matrix.