gcc and math.h

[Joe Dumais]

The ln function is done by "log" in gcc and is supported by math.h.
The log10 function is done by "log10" in gcc and is supported by math.h.
There is a constant M_LOG2E in math.h which is log2 of e.
To get log2 of x, this is the same as M_LOG2E*log(x).

stucklenp wrote:

>Kind persons:
>
>I routinely program using C and compile with gcc.  My problem is that I need
>some math log functions--ln, log10, and log2--and these functions are not
>included in math.h from what I can determine.  Can anyone suggest how I can
>get these functions?
>
>I have tried notes to the glibc groups and not received any replies.
>
>Thanks.
>
>Paul
>
>
>  
>