#47 Problem with numeric solve with erf

[Zbynek Konecny]

num_solve does not work with erf for me, eg num_solve(erf(x)=0.9,x=1)
gives error during function evaluation (e.g. singularity)

[Rainer Schöpf]

The following works:

1: load specfn;

2: load numeric;

3: on rounded;

4: num_solve(erf(x)=0.9,x=1);

{x=1.16308715273}

It should work without "on rounded", though.

I will investigate.

[Rainer Schöpf]

Your example works now if you load the specfn package, ie.

load numeric,specfn;

num_solve(erf(x)=0.9,x=1);

[Rainer Schöpf]

I've just checked in a fix for your problem: specfn is now loaded automatically when erf, ei, si, or ci are evaluated numerically.

Please try your original example again.