December 2000 - GiNaC-list

cln's gmp
by Tilman Utz 16 Jan '01

16 Jan '01

Hi all, I finally suceeded porting cln and Ginac to win32, but just without gmp and ginsh. What disadvantages do I have to exspect from that (especially from the missing of gmp) regards Tilman Utz - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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Release 0.7.0 is on the wire
by Richard B. Kreckel 15 Dec '00

15 Dec '00

Hi all, I have just finished packaging GiNaC 0.7.0. It is sitting at the usual places, see <http://www.ginac.de/Download.html>. Beware that you really do need CLN 1.1 (silently released yesterday) in order to use it! This is so, because CLN 1.1 is interface-incompatible (namespace cln) with earlier versions of CLN and GiNaC 0.7.0 is expecting the new interface. For those of you (Eduardo, Bernard) who want to extract a cln::cl_N from GiNaC::numeric for various reasons, there is now a method GiNaC::numeric::to_cl_N() which does right that. (I was first having a casting operator in mind, but that turned out to lead into ambiguities quite easily so we'll use .to_cl_N() from now on.) Cint users should upgrade to at least 5.14.62 in order to use GiNaC-cint with the current release. So, this is the list of required package versions and the order of steps how to proceed: * Install GMP >= 3.0 (current is 3.1.1) (optional) * Install CLN >= 1.1 (current is 1.1) * Install Cint >= 5.14.62 (current is 5.14.65) (optional) * Install GiNaC 0.7.0 * rejoice, cheer, sing... ;-) We plan to provide .deb and .rpm packages next week. And please read the file NEWS to see what else has changed. Happy hacking -rbk. -- Richard Kreckel <Richard.Kreckel(a)Uni-Mainz.DE> <http://wwwthep.physik.uni-mainz.de/~kreckel/> - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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Extracting only the integral (or fractional) part of a number
by Eduardo M Kalinowski 08 Dec '00

08 Dec '00

Hi, I have another question: how can I extract only the integral (or fractional) part of a number? ie, how to get "3" and "0.141593" from "3.141593"? -- Common sense is the collection of prejudices acquired by age eighteen. -- Albert Einstein Eduardo M Kalinowski (ekalin(a)iname.com) http://move.to/hpkb http://cami-ufpr.hpg.com.br - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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Extracting a numeric from an ex
by Eduardo M Kalinowski 08 Dec '00

08 Dec '00

Continuing the previous message... I would find it extremely useful if it was possible to get a numeric representing the ex's contents, _if_ that is possible, of course. Specifically, it would a be a function like this: class ex { .... numeric to_numeric() const; .... } Or any other significant name. Of course, there are times when a numeric cannot represent an ex. In these cases, the most appropriate solution seems to throw an exception, but other ways of allerting the user are possible. Another function, returning a bool saying wheter the ex can be converted into a numeric would also be nice. Is the above possible? -- The church is near but the road is icy; the bar is far away but I will walk carefully. -- Russian Proverb Eduardo M Kalinowski (ekalin(a)iname.com) http://move.to/hpkb http://cami-ufpr.hpg.com.br - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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Digits variable ignored when parsing strings?
by Eduardo M Kalinowski 07 Dec '00

07 Dec '00

Hi, It seems the value of the 'Digits' variable is ignored when a GiNaC::numeric is created from a string. This behaviour can be observed in ginsh, for example. The created number always has something like 17 digits. I suppose this isn't what should happen. -- God created woman. And boredom did indeed cease from that moment -- but many other things ceased as well. Woman was God's second mistake. -- Nietzsche Eduardo M Kalinowski (ekalin(a)iname.com) http://move.to/hpkb http://cami-ufpr.hpg.com.br - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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Equivalent of evalf for numeric (for fractions)
by Eduardo M Kalinowski 06 Dec '00

06 Dec '00

Hi again, How can I convert a GiNaC::numeric that contains a fraction (or even a integer, for that matter) into a numeric with the real representation of the fraction? Currently I'm adding "0.0" to the numeric to force it into a real number. This works, but is ugly. How about an "evalf" function for GiNaC::numeric? -- I'm always looking for a new idea that will be more productive than its cost. -- David Rockefeller Eduardo M Kalinowski (ekalin(a)iname.com) http://move.to/hpkb http://cami-ufpr.hpg.com.br - To UNSUBSCRIBE, email to ginac-list(a)ginac.de with a subject of "unsubscribe".

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