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.
60 lines
1.3 KiB
60 lines
1.3 KiB
#include "clapack.h" |
|
|
|
doublereal dlapy2_(doublereal *x, doublereal *y) |
|
{ |
|
/* System generated locals */ |
|
doublereal ret_val, d__1; |
|
|
|
/* Builtin functions */ |
|
double sqrt(doublereal); |
|
|
|
/* Local variables */ |
|
doublereal w, z__, xabs, yabs; |
|
|
|
|
|
/* -- LAPACK auxiliary routine (version 3.1) -- */ |
|
/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ |
|
/* November 2006 */ |
|
|
|
/* .. Scalar Arguments .. */ |
|
/* .. */ |
|
|
|
/* Purpose */ |
|
/* ======= */ |
|
|
|
/* DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary */ |
|
/* overflow. */ |
|
|
|
/* Arguments */ |
|
/* ========= */ |
|
|
|
/* X (input) DOUBLE PRECISION */ |
|
/* Y (input) DOUBLE PRECISION */ |
|
/* X and Y specify the values x and y. */ |
|
|
|
/* ===================================================================== */ |
|
|
|
/* .. Parameters .. */ |
|
/* .. */ |
|
/* .. Local Scalars .. */ |
|
/* .. */ |
|
/* .. Intrinsic Functions .. */ |
|
/* .. */ |
|
/* .. Executable Statements .. */ |
|
|
|
xabs = abs(*x); |
|
yabs = abs(*y); |
|
w = max(xabs,yabs); |
|
z__ = min(xabs,yabs); |
|
if (z__ == 0.) { |
|
ret_val = w; |
|
} else { |
|
/* Computing 2nd power */ |
|
d__1 = z__ / w; |
|
ret_val = w * sqrt(d__1 * d__1 + 1.); |
|
} |
|
return ret_val; |
|
|
|
/* End of DLAPY2 */ |
|
|
|
} /* dlapy2_ */
|
|
|