LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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◆ ilaslc()

integer function ilaslc ( integer  M,
integer  N,
real, dimension( lda, * )  A,
integer  LDA 
)

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

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

Purpose:
 ILASLC 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 REAL 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 ilaslc.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 REAL A( LDA, * )
88* ..
89*
90* =====================================================================
91*
92* .. Parameters ..
93 REAL ZERO
94 parameter( zero = 0.0e+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 ilaslc = n
104 ELSE IF( a(1, n).NE.zero .OR. a(m, n).NE.zero ) THEN
105 ilaslc = n
106 ELSE
107* Now scan each column from the end, returning with the first non-zero.
108 DO ilaslc = n, 1, -1
109 DO i = 1, m
110 IF( a(i, ilaslc).NE.zero ) RETURN
111 END DO
112 END DO
113 END IF
114 RETURN
integer function ilaslc(M, N, A, LDA)
ILASLC scans a matrix for its last non-zero column.
Definition: ilaslc.f:78
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