ML_DGECON – Estimates the reciprocal of the condition number of a general real matrix

Block SymbolLicensing group: MATRIX
PIC

Function Description
The output references yA, yWORK and yIWORK are always set to the corresponding input references uA, uWORK and uIWORK. If HLD = on then nothing is computed otherwise the LAPACK function DGECON is called internally:

DGECON(sINORM, N, uA, LDA, anorm, rcond, uWORK, uIWORK, info);

where parameters of DGECON are set in the following way:

The error flag E is set to on if:

See LAPACK documentation [7] for more details.

Inputs

uA

Input reference to matrix A

reference

uWORK

Input reference to working vector WORK

reference

uIWORK

Input reference to integer working vector WORK

reference

INORM

Use Infinity-norm

bool

anorm

Norm of the original matrix A

double

HLD

Hold

bool

Outputs

yA

Output reference to matrix A

reference

yWORK

Output reference to working vector WORK

reference

yIWORK

Output reference to integer working vector WORK

reference

rcond

The reciprocal of the condition number of the matrix A

double

E

Error indicator

bool

info

LAPACK function result info. If info = -i, the i=th argument had an illegal value

long