NAME

use_int_workspace - Provide a block of memory to be used in LAPACK routines that have a integer workspace parameter that can vary in length and are called through the C interfaces. 

SYNOPSIS

#include <sunperf.h>

int use_int_workspace(int ∗ws, int length) ;

PURPOSE

Many LAPACK routines require workspace parameters to provide temporary storage for intermediate results.  Some routines allow varying amounts of workspace to be passed in.  A choice is made between multiple algorithms, using the most efficient method which can operate given the amount of workspace.  The following lapack routines all support varying amounts of integer workspace:
 
chbevd      cheevd      chpevd      cstedc      dgeesx dsbevd      dspevd      dstedc      dstevd      dsyevd dtrsen      sgeesx      ssbevd      sspevd      sstedc sstevd      ssyevd      strsen      zhbevd      zheevd zhpevd      zstedc
 
The C LAPACK interfaces do not require the user to provide workspace.  Tempory storage is dynamically allocated as needed.  By default, the C interfaces use the minimum amount of storage required.  Therefore, the computation for the routines listed above will use the algorithm that requires the least amount of workspace.  In most cases these algorithms require more time.  A larger block of memory can be supplied with the use_int_workspace function, allowing more time-efficient algorithms to be selected.

ARGUMENTS

workspace A pointer to the block of memory to be used as workspace. 

length The length of the workspace array in bytes. 

SunOS 5.0  —  Last change: 10 Dec 1998