ZCHKEC tests eigen- condition estimation routines


        ZTRSYL, CTREXC, CTRSNA, CTRSEN


 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, ZTRSNA and CTRSEN are


 tested by reading in precomputed examples from a file (on input unit


 NIN).  Output is written to output unit NOUT.

THRESH

          THRESH is DOUBLE PRECISION


          Threshold for residual tests.  A computed test ratio passes


          the threshold if it is less than THRESH.

TSTERR

          TSTERR is LOGICAL


          Flag that indicates whether error exits are to be tested.

NIN

          NIN is INTEGER


          The logical unit number for input.

NOUT

          NOUT is INTEGER


          The logical unit number for output.

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