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acos.3Cg
Langue: en
Version: 347255 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
acos - returns arccosine of scalars and vectors.SYNOPSIS
float acos(float a); float1 acos(float1 a); float2 acos(float2 a); float3 acos(float3 a); float4 acos(float4 a);
half acos(half a); half1 acos(half1 a); half2 acos(half2 a); half3 acos(half3 a); half4 acos(half4 a);
fixed acos(fixed a); fixed1 acos(fixed1 a); fixed2 acos(fixed2 a); fixed3 acos(fixed3 a); fixed4 acos(fixed4 a);
PARAMETERS
- a
- Vector or scalar of which to determine the arccosine.
DESCRIPTION
Returns the arccosine of a in the range [0,pi], expecting a to be in the range [-1,+1].For vectors, the returned vector contains the arccosine of each element of the input vector.
REFERENCE IMPLEMENTATION
acos for a float scalar could be implemented like this.// Handbook of Mathematical Functions // M. Abramowitz and I.A. Stegun, Ed.
// Absolute error <= 6.7e-5 float acos(float x) { float negate = float(x < 0); x = abs(x); float ret = -0.0187293; ret = ret * x; ret = ret + 0.0742610; ret = ret * x; ret = ret - 0.2121144; ret = ret * x; ret = ret + 1.5707288; ret = ret * sqrt(1.0-x); ret = ret - 2 * negate * ret; return negate * 3.14159265358979 + ret; }
PROFILE SUPPORT
acos is supported in all profiles.Support in the fp20 is limited.
SEE ALSO
abs, asin, cos, sqrtContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre