CVM Class Library  8.1
This C++ class library encapsulates concepts of vector and different matrices including square, band, symmetric and hermitian ones in Euclidean space of real and complex numbers.
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izamin.f
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1 c BLAS routine missing in ACML and some other implementations
2 
3  integer function izamin(n,zx,incx)
4 c
5 c finds the index of element having max. absolute value.
6 c
7  double complex zx(*)
8  double precision dmin
9  integer i,incx,ix,n
10  double precision cdabs
11 c
12  izamin = 0
13  if( n.lt.1 .or. incx.le.0 )return
14  izamin = 1
15  if(n.eq.1)return
16  if(incx.eq.1)go to 20
17 c
18 c code for increment not equal to 1
19 c
20  ix = 1
21  dmin = cdabs(zx(1))
22  ix = ix + incx
23  do 10 i = 2,n
24  if(cdabs(zx(ix)).ge.dmin) go to 5
25  izamin = i
26  dmin = cdabs(zx(ix))
27  5 ix = ix + incx
28  10 continue
29  return
30 c
31 c code for increment equal to 1
32 c
33  20 dmin = cdabs(zx(1))
34  do 30 i = 2,n
35  if(cdabs(zx(i)).ge.dmin) go to 30
36  izamin = i
37  dmin = cdabs(zx(i))
38  30 continue
39  return
40  end
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