umf_symbolic_usage.c
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/* ========================================================================== */
/* === UMF_symbolic_usage =================================================== */
/* ========================================================================== */
/* -------------------------------------------------------------------------- */
/* UMFPACK Copyright (c) Timothy A. Davis, CISE, */
/* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */
/* web: http://www.cise.ufl.edu/research/sparse/umfpack */
/* -------------------------------------------------------------------------- */
/* Returns the final size of the Symbolic object, in Units */
#include "umf_internal.h"
GLOBAL double UMF_symbolic_usage
(
Int n_row,
Int n_col,
Int nchains,
Int nfr,
Int esize, /* zero if no dense rows. Otherwise, equal to the
* number of non-singleton, non-empty columns */
Int prefer_diagonal
)
{
double units ;
units =
DUNITS (SymbolicType, 1) /* Symbolic structure */
+ 2 * DUNITS (Int, n_col+1) /* Cperm_init, Cdeg */
+ 2 * DUNITS (Int, n_row+1) /* Rperm_init, Rdeg */
+ 3 * DUNITS (Int, nchains+1) /* Chain_ */
+ 4 * DUNITS (Int, nfr+1) ; /* Front_ */
/* if dense rows are present */
units += DUNITS (Int, esize) ; /* Esize */
/* for diagonal pivoting */
if (prefer_diagonal)
{
units += DUNITS (Int, n_col+1) ; /* Diagonal_map */
}
return (units) ;
}