[gmx-developers] lookup table in invsqrt algorithm

[Mark Abraham]

On 18/05/2011 1:30 PM, Haiqing Zhao wrote:
> Hello, all,
>
> Does anybody know gmx_software_invsqrt work? I mean the algorithm. I found the code is in "vec.h" in "include" folder. But I have no idea of how lookup table is produced. There are two: exptab, and fracttab. It uses the space very well.
> I hope you could give me some hint.

See manual appendix B.3

Mark