Linux & Unix Commands - Search Man Pages

Select Section of Man Page:

Select Man Page Repository:

HYPOT(P)POSIX Programmer's Manual HYPOT(P)NAMEhypot, hypotf, hypotl - Euclidean distance functionSYNOPSIS#include <math.h> double hypot(double x, double y); float hypotf(float x, float y); long double hypotl(long double x, long double y);DESCRIPTIONThese functions shall compute the value of the square root of x**2+ y**2 without undue overflow or underflow. An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non- zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.RETURN VALUEUpon successful completion, these functions shall return the length of the hypotenuse of a right-angled triangle with sides of length x and y. If the correct value would cause overflow, a range error shall occur and hypot(), hypotf(), and hypotl() shall return the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. If x or y is +-Inf, +Inf shall be returned (even if one of x or y is NaN). If x or y is NaN, and the other is not +-Inf, a NaN shall be returned. If both arguments are subnormal and the correct result is subnormal, a range error may occur and the correct result is returned.ERRORSThese functions shall fail if: Range Error The result overflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non- zero, then the overflow floating-point exception shall be raised. These functions may fail if: Range Error The result underflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non- zero, then the underflow floating-point exception shall be raised. The following sections are informative.EXAMPLESNone.APPLICATION USAGEhypot(x,y), hypot(y,x), and hypot(x, -y) are equivalent. hypot(x, +-0) is equivalent to fabs(x). Underflow only happens when both x and y are subnormal and the (inexact) result is also subnormal. These functions take precautions against overflow during intermediate steps of the compu- tation. On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.RATIONALENone.FUTURE DIRECTIONSNone.SEE ALSOfeclearexcept() , fetestexcept() , isnan() , sqrt() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Func- tions, <math.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information TechnologyPortable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The orig- inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .--IEEE/The Open Group 2003 HYPOT(P)

All times are GMT -4. The time now is 03:25 PM.

Unix & Linux Forums Content Copyright©1993-2018. All Rights Reserved.

×

UNIX.COM Login