42 lines
967 B
FortranFixed
42 lines
967 B
FortranFixed
|
integer function icamaxf(n,cx,incx)
|
||
|
c
|
||
|
c finds the index of element having max. absolute value.
|
||
|
c jack dongarra, linpack, 3/11/78.
|
||
|
c modified 3/93 to return if incx .le. 0.
|
||
|
c modified 12/3/93, array(1) declarations changed to array(*)
|
||
|
c
|
||
|
complex cx(*)
|
||
|
real smax
|
||
|
integer i,incx,ix,n
|
||
|
real scabs1
|
||
|
c
|
||
|
icamaxf = 0
|
||
|
if( n.lt.1 .or. incx.le.0 ) return
|
||
|
icamaxf = 1
|
||
|
if(n.eq.1)return
|
||
|
if(incx.eq.1)go to 20
|
||
|
c
|
||
|
c code for increment not equal to 1
|
||
|
c
|
||
|
ix = 1
|
||
|
smax = scabs1(cx(1))
|
||
|
ix = ix + incx
|
||
|
do 10 i = 2,n
|
||
|
if(scabs1(cx(ix)).le.smax) go to 5
|
||
|
icamaxf = i
|
||
|
smax = scabs1(cx(ix))
|
||
|
5 ix = ix + incx
|
||
|
10 continue
|
||
|
return
|
||
|
c
|
||
|
c code for increment equal to 1
|
||
|
c
|
||
|
20 smax = scabs1(cx(1))
|
||
|
do 30 i = 2,n
|
||
|
if(scabs1(cx(i)).le.smax) go to 30
|
||
|
icamaxf = i
|
||
|
smax = scabs1(cx(i))
|
||
|
30 continue
|
||
|
return
|
||
|
end
|