Calculates the natural logarithm of a floating-point number.

[Format]

#include <mathf.h>

float logf (float f);

[Parameters]

f Floating-point number for which natural logarithm is to be computed

[Return values]

Normal: Natural logarithm of f

Abnormal: Domain error: Returns not-a-number.

[Remarks]

A domain error occurs if f is negative.

A range error occurs if f is 0.0.