01:       SUBROUTINE XERBLA( SRNAME, INFO )
02: *
03: *  -- LAPACK auxiliary routine (preliminary version) --
04: *     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
05: *     November 2006
06: *
07: *     .. Scalar Arguments ..
08:       CHARACTER*(*)      SRNAME
09:       INTEGER            INFO
10: *     ..
11: *
12: *  Purpose
13: *  =======
14: *
15: *  XERBLA  is an error handler for the LAPACK routines.
16: *  It is called by an LAPACK routine if an input parameter has an
17: *  invalid value.  A message is printed and execution stops.
18: *
19: *  Installers may consider modifying the STOP statement in order to
20: *  call system-specific exception-handling facilities.
21: *
22: *  Arguments
23: *  =========
24: *
25: *  SRNAME  (input) CHARACTER*(*)
26: *          The name of the routine which called XERBLA.
27: *
28: *  INFO    (input) INTEGER
29: *          The position of the invalid parameter in the parameter list
30: *          of the calling routine.
31: *
32: * =====================================================================
33: *
34: *     .. Intrinsic Functions ..
35:       INTRINSIC          LEN_TRIM
36: *     ..
37: *     .. Executable Statements ..
38: *
39:       WRITE( *, FMT = 9999 )SRNAME( 1:LEN_TRIM( SRNAME ) ), INFO
40: *
41:       STOP
42: *
43:  9999 FORMAT( ' ** On entry to ', A, ' parameter number ', I2, ' had ',
44:      $      'an illegal value' )
45: *
46: *     End of XERBLA
47: *
48:       END
49: