1 files changed, 37 insertions, 0 deletions
diff --git a/2.3-1/src/fortran/blas/drot.f b/2.3-1/src/fortran/blas/drot.f
new file mode 100644
index 00000000..b9ea3bd9
--- /dev/null
+++ b/2.3-1/src/fortran/blas/drot.f
@@ -0,0 +1,37 @@
+      subroutine  drot (n,dx,incx,dy,incy,c,s)
+c
+c     applies a plane rotation.
+c     jack dongarra, linpack, 3/11/78.
+c     modified 12/3/93, array(1) declarations changed to array(*)
+c
+      double precision dx(*),dy(*),dtemp,c,s
+      integer i,incx,incy,ix,iy,n
+c
+      if(n.le.0)return
+      if(incx.eq.1.and.incy.eq.1)go to 20
+c
+c       code for unequal increments or equal increments not equal
+c         to 1
+c
+      ix = 1
+      iy = 1
+      if(incx.lt.0)ix = (-n+1)*incx + 1
+      if(incy.lt.0)iy = (-n+1)*incy + 1
+      do 10 i = 1,n
+        dtemp = c*dx(ix) + s*dy(iy)
+        dy(iy) = c*dy(iy) - s*dx(ix)
+        dx(ix) = dtemp
+        ix = ix + incx
+        iy = iy + incy
+   10 continue
+      return
+c
+c       code for both increments equal to 1
+c
+   20 do 30 i = 1,n
+        dtemp = c*dx(i) + s*dy(i)
+        dy(i) = c*dy(i) - s*dx(i)
+        dx(i) = dtemp
+   30 continue
+      return
+      end