Hi, Here's the patch I posted for the linear algebra problem. I think the issue is definitely subtler than Robert Bradshaw's patch suggests. See below.
-- William
---------- Forwarded message ----------
From: William Stein <[EMAIL PROTECTED]>
Date: Jun 6, 2007 6:55 PM
Subject: Re: [sage-support] ring conversion error
To: [EMAIL PROTECTED]
On 6/6/07, Thea Gegenberg <[EMAIL PROTECTED]> wrote:
> If I am working with matrices over integers mod something then we I
> try to multiply a row by some number I get an error for moduli between
> 46341 and 18446744073709551614.
>
> Here is an example of what I am doing:
> sage: D=46341
> sage: u=7
> sage: R=Integers(D)
> sage: p=matrix(R,[[84, 97, 55, 58, 51]])
> sage: R(u)*p.row(0)
>
> The error I get is "TypeError: Cannot convert
> sage.rings.integer_mod.IntegerMod_int64 to
> sage.rings.integer_mod.IntegerMod_int".
(1) As a hack, you could make your matrix sparse, so a different
data type is used, and the error will go away:
p=matrix(R,[[84, 97, 55, 58, 51]], sparse=True)
This will -- of course -- be slower.
(2) Or -- you could apply the attached patch with
hg_sage.import_patch('4878.patch')
-- William
--
William Stein
Associate Professor of Mathematics
University of Washington
http://www.williamstein.org
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4878.patch
Description: Binary data
