NAME

log10 - returns the base-10 logarithm of scalars and vectors

SYNOPSIS

  float  log10(float a);
  float1 log10(float1 a);
  float2 log10(float2 a);
  float3 log10(float3 a);
  float4 log10(float4 a);
 
  half   log10(half a);
  half1  log10(half1 a);
  half2  log10(half2 a);
  half3  log10(half3 a);
  half4  log10(half4 a);
 
  fixed  log10(fixed a);
  fixed1 log10(fixed1 a);
  fixed2 log10(fixed2 a);
  fixed3 log10(fixed3 a);
  fixed4 log10(fixed4 a);

PARAMETERS

a

Vector or scalar of which to determine the base-10 logarithm.

DESCRIPTION

Returns the base-10 logarithm a.

For vectors, the returned vector contains the base-10 logarithm of each element of the input vector.

REFERENCE IMPLEMENTATION

  float3 log10(float3 a)
  {
    float3 rv;
    int i;

    for (i=0; i<3; i++) {
      rv[i] = log10(a[i]);  // this is the ANSI C standard library log10()
    }
    return rv;
  }

log10 is typically implemented with a native base-10 logarithm instruction.

PROFILE SUPPORT

log10 is fully supported in all profiles unless otherwise specified.

Support in the fp20 is limited to constant compile-time evaluation.

SEE ALSO

exp, log, log2, pow