> # NAME

> abs - returns absolute value of scalars and vectors.

> # SYNOPSIS

>       float  abs( float  a );
>       float1 abs( float1 a );
>       float2 abs( float2 a );
>       float3 abs( float3 a );
>       float4 abs( float4 a );

>       half   abs( half  a );
>       half1  abs( half1 a );
>       half2  abs( half2 a );
>       half3  abs( half3 a );
>       half4  abs( half4 a );

>       fixed  abs( fixed  a );
>       fixed1 abs( fixed1 a );
>       fixed2 abs( fixed2 a );
>       fixed3 abs( fixed3 a );
>       fixed4 abs( fixed4 a );

> # PARAMETERS

> a

>   Vector or scalar of which to determine the absolute value.

> # DESCRIPTION

> Returns the absolute value of a scalar or vector.

> For vectors, the returned vector contains the absolute value of each element of the input vector.

> # REFERENCE IMPLEMENTATION

> abs for a float scalar could be implemented like this.

>       float abs(float a)
>       {
>         return max(-a, a);
>       }

> # PROFILE SUPPORT

> abs is supported in all profiles.

> Support in the fp20 is limited.

> Consider abs to be free or extremely inexpensive.

> # SEE ALSO

> max