Re[2]: [Maxima] [Q] How to get a float in this case?

On Fri, 2004-08-27 at 12:19, Vladimir Bondarenko wrote:
> Hello RJF and JA,
> 
> Thanks much for your instant help!

Make sure you read the reply from Stavros Macrakis. His advice (to use
rectform) was much better than mine.

> RJF> romberg, or bromberg for bigfloats.
> 
> Yes, I use romberg. By the way, it has such a behavior
> 
> 
>          ROMBERG(1/z^2, z, 1, INF);
> 
>          Error: $INF is not of type (OR RATIONAL LISP:FLOAT).
>          
> 
> while I expected 1.0.
> 
> Can I use romberg successfully over semi-infinite intervals?

Actually, I would advise you to try to use the new quadpack routines.
Try "describe(quad);" Unfortunately, they lack high-level documentation.
You will probably have to read the documentation for all of them in
order to have a reasonable guess as to which is right for you.

(%i21) quad_qagi(1/x^2,x,1,inf);

(%o21)                [1.0, 1.11022302462516e-14, 15, 0]

You will even have to read the documentation to understand the output!

> Secondly, in 5.9.0.9beta2 an attempt to load quanc8,  load("qq");
> or load("qq.lisp");  fails with
> 
>          Could not find `qq' using paths in FILE_SEARCH_MAXIMA,FILE_SEARCH_LISP
> 
> 
> I am new in Maxima, couldn't I hear what's wrong?

Hmm. I'm not sure. I can't reproduce your problem. 

(%i1) load("qq");

;

; Warning: This function is undefined:
;   CALL-QUANC8
(%o1)
/home/amundson/opt/maxima/share/maxima/5.9.0.9beta2/share/numeric/qq.lisp

Which platform are you using? The output of build_info() would be
helpful.

--Jim