# gslevu - avram - a virtual machine code interpreter
avram - a virtual machine code interpreter

### D.6 `gslevu`

This library exports a pair of functions of the form

         library('gslevu','accel')

         library('gslevu','utrunc')

that take a list of real numbers x to a pair of real numbers `(`s`,`e`)`.

The idea is that x represents the first few terms of an infinite series whose sum converges, but only very slowly. The functions extrapolate an estimate of the infinite summation by the Levin u-transform as documented in the GNU Scientific Library reference manual.

For well behaved series, considerably fewer terms are needed for an accurate estimate than a direct summation would require.