DCHKEC
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DCHKEC tests eigen- condition estimation routines
DLALN2, DLASY2, DLANV2, DLAQTR, DLAEXC,
DTRSYL, DTREXC, DTRSNA, DTRSEN
In all cases, the routine runs through a fixed set of numerical
examples, subjects them to various tests, and compares the test
results to a threshold THRESH. In addition, DTREXC, DTRSNA and DTRSEN
are tested by reading in precomputed examples from a file (on input
unit NIN). Output is written to output unit NOUT.
DLALN2, DLASY2, DLANV2, DLAQTR, DLAEXC,
DTRSYL, DTREXC, DTRSNA, DTRSEN
In all cases, the routine runs through a fixed set of numerical
examples, subjects them to various tests, and compares the test
results to a threshold THRESH. In addition, DTREXC, DTRSNA and DTRSEN
are tested by reading in precomputed examples from a file (on input
unit NIN). Output is written to output unit NOUT.
Arguments
| THRESH |
(input) DOUBLE PRECISION
Threshold for residual tests. A computed test ratio passes
the threshold if it is less than THRESH. |
| TSTERR |
(input) LOGICAL
Flag that indicates whether error exits are to be tested.
|
| NIN |
(input) INTEGER
The logical unit number for input.
|
| NOUT |
(input) INTEGER
The logical unit number for output.
|