Import GotoBLAS2 1.13 BSD version codes.

2011-01-24 14:54:24 +00:00
commit 342bbc3871
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+      integer function idamaxf(n,dx,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
+      double precision dx(*),dmax
+      integer i,incx,ix,n
+c
+      idamaxf = 0
+      if( n.lt.1 .or. incx.le.0 ) return
+      idamaxf = 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
+      dmax = dabs(dx(1))
+      ix = ix + incx
+      do 10 i = 2,n
+         if(dabs(dx(ix)).le.dmax) go to 5
+         idamaxf = i
+         dmax = dabs(dx(ix))
+    5    ix = ix + incx
+   10 continue
+      return
+c
+c        code for increment equal to 1
+c
+   20 dmax = dabs(dx(1))
+      do 30 i = 2,n
+         if(dabs(dx(i)).le.dmax) go to 30
+         idamaxf = i
+         dmax = dabs(dx(i))
+   30 continue
+      return
+      end