|Bill Allombert on Thu, 09 May 2013 12:52:19 +0200|
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|Re: Extracting numbers from strings|
On Wed, May 08, 2013 at 05:40:02PM +0100, Richard in Reading wrote: > I'm using forell to search through elliptic curves and I want to extract the > numeric value of the conductor preferably without using ellinit and > ellglobalred which make it too slow. > As an example, I'd like to be able to replicate the following > > forell(E,1,100,print(E"\t"ellglobalred(ellinit(E)))) > > 11a1 11 > 11a2 11 > 11a3 11 > 14a1 14 > 14a2 14 > > just by manipulating E instead of dealing with E. Hopefully this would be faster. Use ellconvertname() ? ellconvertname ellconvertname(name): convert an elliptic curve name (as found in the elldata database) from a string to a triplet [conductor, isogeny class, index]. It will also convert a triplet back to a curve name. Cheers, Bill.