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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isamin.f
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1 c BLAS routine missing in ACML and some other implementations
2 
3  integer function isamin(n,sx,incx)
4 c
5 c finds the index of element having min. absolute value.
6 c
7  real sx(*),smin
8  integer i,incx,ix,n
9 c
10  isamin = 0
11  if( n.lt.1 .or. incx.le.0 ) return
12  isamin = 1
13  if(n.eq.1)return
14  if(incx.eq.1)go to 20
15 c
16 c code for increment not equal to 1
17 c
18  ix = 1
19  smin = abs(sx(1))
20  ix = ix + incx
21  do 10 i = 2,n
22  if(abs(sx(ix)).ge.smin) go to 5
23  isamin = i
24  smin = abs(sx(ix))
25  5 ix = ix + incx
26  10 continue
27  return
28 c
29 c code for increment equal to 1
30 c
31  20 smin = abs(sx(1))
32  do 30 i = 2,n
33  if(abs(sx(i)).ge.smin) go to 30
34  isamin = i
35  smin = abs(sx(i))
36  30 continue
37  return
38  end
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