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