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OpenBLAS/reference/izamaxf.f

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  1.       integer function izamaxf(n,zx,incx)

  2. c

  3. c     finds the index of element having max. absolute value.

  4. c     jack dongarra, 1/15/85.

  5. c     modified 3/93 to return if incx .le. 0.

  6. c     modified 12/3/93, array(1) declarations changed to array(*)

  7. c

  8.       double complex zx(*)

  9.       double precision smax

  10.       integer i,incx,ix,n

  11.       double precision dcabs1

  12. c

  13.       izamaxf = 0

  14.       if( n.lt.1 .or. incx.le.0 )return

  15.       izamaxf = 1

  16.       if(n.eq.1)return

  17.       if(incx.eq.1)go to 20

  18. c

  19. c        code for increment not equal to 1

  20. c

  21.       ix = 1

  22.       smax = dcabs1(zx(1))

  23.       ix = ix + incx

  24.       do 10 i = 2,n

  25.          if(dcabs1(zx(ix)).le.smax) go to 5

  26.          izamaxf = i

  27.          smax = dcabs1(zx(ix))

  28.     5    ix = ix + incx

  29.    10 continue

  30.       return

  31. c

  32. c        code for increment equal to 1

  33. c

  34.    20 smax = dcabs1(zx(1))

  35.       do 30 i = 2,n

  36.          if(dcabs1(zx(i)).le.smax) go to 30

  37.          izamaxf = i

  38.          smax = dcabs1(zx(i))

  39.    30 continue

  40.       return

  41.       end