Logarithm and Related Functions

Information on the properties of the Logarithm function can be found in Abramowitz & Stegun, Chapter 4.

gsl_sf_log(x)

This routine computes the logarithm of \(x\), \(\log(x)\), for \(x > 0\).

gsl_sf_log_abs(x)

This routine computes the logarithm of the magnitude of \(x\), \(\log(|x|)\), for \(x \ne 0\).

gsl_sf_log_1plusx(x)

This routine computes \(\log(1 + x)\) for \(x > -1\) using an algorithm that is accurate for small \(x\).

gsl_sf_log_1plusx_mx(x)

This routine computes \(\log(1 + x) - x\) for \(x > -1\) using an algorithm that is accurate for small \(x\).