`scipy.sparse.linalg._dsolve._superlu:gstrf`

Summary

performs a factorization of the sparse matrix A=*(N,nnz,nzvals,rowind,colptr) and returns a factored_lu object.

Matrix to be factorized is represented as N,nnz,nzvals,rowind,colptr: as separate arguments. This is compressed sparse column representation.
N : int: number of rows and columns
nnz : int: number of non-zero elements
nzvals : array: non-zero values
rowind : array: row-index for this column (same size as nzvals)
colptr : array: index into rowind for first non-zero value in this column size is (N+1). Last value should be nnz.

options: specifies additional options for SuperLU (same keys and values as in superlu_options_t C structure, and additionally 'Relax' and 'PanelSize')
ilu : bool: whether to perform an incomplete LU decomposition (default: false)