1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
DOUBLE PRECISION FUNCTION DLA_RPVGRW( N, NCOLS, A, LDA, AF, LDAF )
*
* -- LAPACK routine (version 3.2) --
* -- Contributed by James Demmel, Deaglan Halligan, Yozo Hida and --
* -- Jason Riedy of Univ. of California Berkeley. --
* -- November 2008 --
*
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley and NAG Ltd. --
*
IMPLICIT NONE
* ..
* .. Scalar Arguments ..
INTEGER N, NCOLS, LDA, LDAF
* ..
* .. Array Arguments ..
DOUBLE PRECISION A( LDA, * ), AF( LDAF, * )
* ..
*
* =====================================================================
*
* .. Local Scalars ..
INTEGER I, J
DOUBLE PRECISION AMAX, UMAX, RPVGRW
* ..
* .. Intrinsic Functions ..
INTRINSIC ABS, MAX, MIN
* ..
* .. Executable Statements ..
*
RPVGRW = 1.0D+0
*
DO J = 1, NCOLS
AMAX = 0.0D+0
UMAX = 0.0D+0
DO I = 1, N
AMAX = MAX( ABS( A( I, J ) ), AMAX )
END DO
DO I = 1, J
UMAX = MAX( ABS( AF( I, J ) ), UMAX )
END DO
IF ( UMAX /= 0.0D+0 ) THEN
RPVGRW = MIN( AMAX / UMAX, RPVGRW )
END IF
END DO
DLA_RPVGRW = RPVGRW
END FUNCTION
|
