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asin.3Cg
Langue: en
Version: 350946 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
asin - returns arcsine of scalars and vectors.SYNOPSIS
float asin(float a); float1 asin(float1 a); float2 asin(float2 a); float3 asin(float3 a); float4 asin(float4 a);
half asin(half a); half1 asin(half1 a); half2 asin(half2 a); half3 asin(half3 a); half4 asin(half4 a);
fixed asin(fixed a); fixed1 asin(fixed1 a); fixed2 asin(fixed2 a); fixed3 asin(fixed3 a); fixed4 asin(fixed4 a);
PARAMETERS
- a
- Vector or scalar of which to determine the arcsine.
DESCRIPTION
Returns the arcsine of a in the range [-pi/2,+pi/2], expecting a to be in the range [-1,+1].For vectors, the returned vector contains the arcsine of each element of the input vector.
REFERENCE IMPLEMENTATION
asin for a float scalar could be implemented like this.// Handbook of Mathematical Functions // M. Abramowitz and I.A. Stegun, Ed.
float asin(float x) { float negate = float(x < 0); x = abs(x); float ret = -0.0187293; ret *= x; ret += 0.0742610; ret *= x; ret -= 0.2121144; ret *= x; ret += 1.5707288; ret = 3.14159265358979*0.5 - sqrt(1.0 - x)*ret; return ret - 2 * negate * ret; }
PROFILE SUPPORT
asin is supported in all profiles.Support in the fp20 is limited.
SEE ALSO
abs, acos, sin, sqrtContenus ©2006-2024 Benjamin Poulain
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