Re: [Maxima-discuss] quadpack double integral error in v. 5.31.2

[Leo B. <l_b...@us...>]

>   > Perhaps this is an evaluation issue, where the outer quad_qags is
>   > evaluating the integrand, causing the inner quad_qags to be evaluated
>   > which triggers the error?
>
>   Pretty sure the the inner call is being evaluated first (according to
>   standard evaluation policy) and that's why it triggers an error --
>   the variable of integration of the outer call isn't assigned a value
>   yet. When the outer call evaluates its integrand, it will succeed since
>   by then both variables are defined.

Yes, that is what is happening, and that is why the code that I posted
works: it wraps inner calls in lambda forms to prevent premature
evaluation of the inner calls to quad_*.

Leo