mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
2.3 KiB
110 lines
2.3 KiB
/* ddot.f -- translated by f2c (version 20061008). |
|
You must link the resulting object file with libf2c: |
|
on Microsoft Windows system, link with libf2c.lib; |
|
on Linux or Unix systems, link with .../path/to/libf2c.a -lm |
|
or, if you install libf2c.a in a standard place, with -lf2c -lm |
|
-- in that order, at the end of the command line, as in |
|
cc *.o -lf2c -lm |
|
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., |
|
|
|
http://www.netlib.org/f2c/libf2c.zip |
|
*/ |
|
|
|
#include "clapack.h" |
|
|
|
|
|
doublereal ddot_(integer *n, doublereal *dx, integer *incx, doublereal *dy, |
|
integer *incy) |
|
{ |
|
/* System generated locals */ |
|
integer i__1; |
|
doublereal ret_val; |
|
|
|
/* Local variables */ |
|
integer i__, m, ix, iy, mp1; |
|
doublereal dtemp; |
|
|
|
/* .. Scalar Arguments .. */ |
|
/* .. */ |
|
/* .. Array Arguments .. */ |
|
/* .. */ |
|
|
|
/* Purpose */ |
|
/* ======= */ |
|
|
|
/* forms the dot product of two vectors. */ |
|
/* uses unrolled loops for increments equal to one. */ |
|
/* jack dongarra, linpack, 3/11/78. */ |
|
/* modified 12/3/93, array(1) declarations changed to array(*) */ |
|
|
|
|
|
/* .. Local Scalars .. */ |
|
/* .. */ |
|
/* .. Intrinsic Functions .. */ |
|
/* .. */ |
|
/* Parameter adjustments */ |
|
--dy; |
|
--dx; |
|
|
|
/* Function Body */ |
|
ret_val = 0.; |
|
dtemp = 0.; |
|
if (*n <= 0) { |
|
return ret_val; |
|
} |
|
if (*incx == 1 && *incy == 1) { |
|
goto L20; |
|
} |
|
|
|
/* code for unequal increments or equal increments */ |
|
/* not equal to 1 */ |
|
|
|
ix = 1; |
|
iy = 1; |
|
if (*incx < 0) { |
|
ix = (-(*n) + 1) * *incx + 1; |
|
} |
|
if (*incy < 0) { |
|
iy = (-(*n) + 1) * *incy + 1; |
|
} |
|
i__1 = *n; |
|
for (i__ = 1; i__ <= i__1; ++i__) { |
|
dtemp += dx[ix] * dy[iy]; |
|
ix += *incx; |
|
iy += *incy; |
|
/* L10: */ |
|
} |
|
ret_val = dtemp; |
|
return ret_val; |
|
|
|
/* code for both increments equal to 1 */ |
|
|
|
|
|
/* clean-up loop */ |
|
|
|
L20: |
|
m = *n % 5; |
|
if (m == 0) { |
|
goto L40; |
|
} |
|
i__1 = m; |
|
for (i__ = 1; i__ <= i__1; ++i__) { |
|
dtemp += dx[i__] * dy[i__]; |
|
/* L30: */ |
|
} |
|
if (*n < 5) { |
|
goto L60; |
|
} |
|
L40: |
|
mp1 = m + 1; |
|
i__1 = *n; |
|
for (i__ = mp1; i__ <= i__1; i__ += 5) { |
|
dtemp = dtemp + dx[i__] * dy[i__] + dx[i__ + 1] * dy[i__ + 1] + dx[ |
|
i__ + 2] * dy[i__ + 2] + dx[i__ + 3] * dy[i__ + 3] + dx[i__ + |
|
4] * dy[i__ + 4]; |
|
/* L50: */ |
|
} |
|
L60: |
|
ret_val = dtemp; |
|
return ret_val; |
|
} /* ddot_ */
|
|
|