LAPACK  3.10.0 LAPACK: Linear Algebra PACKage

◆ iladlc()

 integer function iladlc ( integer M, integer N, double precision, dimension( lda, * ) A, integer LDA )

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

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

Purpose:
` ILADLC 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 DOUBLE PRECISION 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).```

Definition at line 77 of file iladlc.f.

78 *
79 * -- LAPACK auxiliary routine --
80 * -- LAPACK is a software package provided by Univ. of Tennessee, --
81 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
82 *
83 * .. Scalar Arguments ..
84  INTEGER M, N, LDA
85 * ..
86 * .. Array Arguments ..
87  DOUBLE PRECISION A( LDA, * )
88 * ..
89 *
90 * =====================================================================
91 *
92 * .. Parameters ..
93  DOUBLE PRECISION ZERO
94  parameter( zero = 0.0d+0 )
95 * ..
96 * .. Local Scalars ..
97  INTEGER I
98 * ..
99 * .. Executable Statements ..
100 *
101 * Quick test for the common case where one corner is non-zero.
102  IF( n.EQ.0 ) THEN
103  iladlc = n
104  ELSE IF( a(1, n).NE.zero .OR. a(m, n).NE.zero ) THEN
105  iladlc = n
106  ELSE
107 * Now scan each column from the end, returning with the first non-zero.
108  DO iladlc = n, 1, -1
109  DO i = 1, m
110  IF( a(i, iladlc).NE.zero ) RETURN
111  END DO
112  END DO
113  END IF
114  RETURN
integer function iladlc(M, N, A, LDA)
ILADLC scans a matrix for its last non-zero column.
Definition: iladlc.f:78