ilaclc()

integer function ilaclc	(	integer	m,
		integer	n,
		complex, dimension( lda, * )	a,
		integer	lda
	)

ILACLC scans a matrix for its last non-zero column.

Download ILACLC + dependencies [TGZ] [ZIP] [TXT]

Purpose:

 ILACLC scans A for its last non-zero column.

Parameters

[in]	M	M is INTEGER The number of rows of the matrix A.
[in]	N	N is INTEGER The number of columns of the matrix A.
[in]	A	A is COMPLEX array, dimension (LDA,N) The m by n matrix A.
[in]	LDA	LDA is INTEGER The leading dimension of the array A. LDA >= max(1,M).

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 77 of file ilaclc.f.

*
*  -- LAPACK auxiliary routine --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. Scalar Arguments ..
      INTEGER            M, N, LDA
*     ..
*     .. Array Arguments ..
      COMPLEX            A( LDA, * )
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      COMPLEX          ZERO
      parameter( zero = (0.0e+0, 0.0e+0) )
*     ..
*     .. Local Scalars ..
      INTEGER I
*     ..
*     .. Executable Statements ..
*
*     Quick test for the common case where one corner is non-zero.
      IF( n.EQ.0 ) THEN
         ilaclc = n
      ELSE IF( a(1, n).NE.zero .OR. a(m, n).NE.zero ) THEN
         ilaclc = n
      ELSE
*     Now scan each column from the end, returning with the first non-zero.
         DO ilaclc = n, 1, -1
            DO i = 1, m
               IF( a(i, ilaclc).NE.zero ) RETURN
            END DO
         END DO
      END IF
      RETURN

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