NAME

TESTING/LIN/cget04.f

SYNOPSIS

Functions/Subroutines

subroutine cget04 (n, nrhs, x, ldx, xact, ldxact, rcond, resid)
CGET04

Function/Subroutine Documentation

subroutine cget04 (integer n, integer nrhs, complex, dimension( ldx, * ) x, integer ldx, complex, dimension( ldxact, * ) xact, integer ldxact, real rcond, real resid)

CGET04

Purpose:



 CGET04 computes the difference between a computed solution and the


 true solution to a system of linear equations.


 RESID =  ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ),


 where RCOND is the reciprocal of the condition number and EPS is the


 machine epsilon.

Parameters



          N is INTEGER


          The number of rows of the matrices X and XACT.  N >= 0.

NRHS



          NRHS is INTEGER


          The number of columns of the matrices X and XACT.  NRHS >= 0.



          X is COMPLEX array, dimension (LDX,NRHS)


          The computed solution vectors.  Each vector is stored as a


          column of the matrix X.

LDX



          LDX is INTEGER


          The leading dimension of the array X.  LDX >= max(1,N).

XACT



          XACT is COMPLEX array, dimension (LDX,NRHS)


          The exact solution vectors.  Each vector is stored as a


          column of the matrix XACT.

LDXACT



          LDXACT is INTEGER


          The leading dimension of the array XACT.  LDXACT >= max(1,N).

RCOND



          RCOND is REAL


          The reciprocal of the condition number of the coefficient


          matrix in the system of equations.

RESID



          RESID is REAL


          The maximum over the NRHS solution vectors of


          ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS )

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 101 of file cget04.f.

Author

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