Option variable
rombergabs
Default value: 0.0
The accuracy of romberg
is governed by the global variables
rombergabs
and rombergtol
.
romberg
terminates successfully when
the absolute difference between successive approximations is less than rombergabs
,
or the relative difference in successive approximations is less than rombergtol
.
Thus when rombergabs
is 0.0 (the default)
only the relative error test has any effect on romberg
.