sincos - Online Linux Manual PageSection : 3
Updated : 2023-01-07
Source : Linux man-pages 6.03

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NAMEsincos, sincosf, sincosl − calculate sin and cos simultaneously

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <math.h>void sincos(double x, double *sin, double *cos); void sincosf(float x, float *sin, float *cos); void sincosl(long double x, long double *sin, long double *cos);

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DESCRIPTIONSeveral applications need sine and cosine of the same angle x. These functions compute both at the same time, and store the results in *sin and *cos. Using this function can be more efficient than two separate calls to sin(3) and cos(3). If x is a NaN, a NaN is returned in *sin and *cos. If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in *sin and *cos.

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RETURN VALUEThese functions return void.

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ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is an infinity  errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue sincos(), sincosf(), sincosl() Thread safetyMT-Safe

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STANDARDSThese functions are GNU extensions.

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NOTESTo see the performance advantage of sincos(), it may be necessary to disable gcc(1) built-in optimizations, using flags such as: cc −O −lm −fno−builtin prog.c

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BUGSBefore glibc 2.22, the glibc implementation did not set errno to EDOM when a domain error occurred.

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SEE ALSOcos(3), sin(3), tan(3) 0

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