Date: 2003 Dec 03
  erf -> http://www.netlib.org/specfun/erf
  erftst -> http://www.netlib.org/specfun/erftst

To extract the double precision version:

grep -v '^CS' erf | sed 's/^CD/  /' > erf.f
grep -v '^CS' erftst | sed 's/^CD/  /' > erftst.f

To print commands for Python regression tests insert before
return statements of erf, erfc and erfcx:

erf.f:      write(6,*) 'erf_verify(erf,', x, ',', result, ')'
erf.f:      write(6,*) 'erf_verify(erfc,', x, ',', result, ')'
erf.f:      write(6,*) 'erf_verify(erfcx,', x, ',', result, ')'
