REAL*8 function dzamaxf(n,zx,incx) c c finds the index of element having max. absolute value. c jack dongarra, 1/15/85. c modified 3/93 to return if incx .le. 0. c modified 12/3/93, array(1) declarations changed to array(*) c COMPLEX*16 zx(*) integer i,incx,ix,n double precision dcabs1 c dzamaxf = 0. if( n.lt.1 .or. incx.le.0 )return dzamaxf = dcabs1(zx(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 dzamaxf = dcabs1(zx(1)) ix = ix + incx do 10 i = 2,n if(dcabs1(zx(ix)).le.dzamaxf) go to 5 dzamaxf = i dzamaxf = dcabs1(zx(ix)) 5 ix = ix + incx 10 continue return c c code for increment equal to 1 c 20 dzamaxf = dcabs1(zx(1)) do 30 i = 2,n if(dcabs1(zx(i)).le.dzamaxf) go to 30 dzamaxf = i dzamaxf = dcabs1(zx(i)) 30 continue return end