[Octave-bug-tracker] [bug #52074] Missing integration functions integral2, integral3

[Nicholas Jankowski]

Follow-up Comment #2, bug #52074 (project octave):

the wrapper could call quadgk instead of the default quadcc. while we couldn't
pass a desired reltol to it, quadgk would by default attempt to satisfy the
default reltol (1e-6 or 1e-4 for single) in addition to any specified abstol
(or the default if unspecified 1e-10, 1e-5 for single)

for compatibility: integral2 normally would impose a default of both abstol
and reltol. if i do that, there is no way for the user to override or change
the reltol.  

perhaps I have it call quadgk by default, so that it imposes the correct
default tolerances. abstol can be adjusted as normal. if reltol is called, i
warn that it cannot be adjusted. but I can offer a reltol="off" option, and I
would switch the integrator back over to quadcc.  that's about the most
control I can give without rewriting dblquad.

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