[sage-support] Re: Categories and morphisms

2010-04-30 Thread Simon King
Hi! On Apr 29, 7:21 am, William Stein wst...@gmail.com wrote: The T-shirt I'm wearing says -- It's easy.  Implement it and post a patch. OK, done. At #8807, I post patches that -- I believe -- solve the problems of 1) creating a ring homomorphism from a homomorphism of the base ring 2)

[sage-support] RDF Sparse matrix.

2010-04-30 Thread Thierry Dumont
I have questions about RDF (and CDF) sparse matrices. How are they implemented? -for dense matrices, sage uses Scipy matrices and this is transparent. -but, how are sparse matrices (RDF,CDF) implemented? 1) Are they Scipy matrices ? 2) if yes: there are different data structures for

Re: [sage-support] RDF Sparse matrix.

2010-04-30 Thread Robert Bradshaw
On Apr 30, 2010, at 9:34 AM, Thierry Dumont wrote: I have questions about RDF (and CDF) sparse matrices. How are they implemented? -for dense matrices, sage uses Scipy matrices and this is transparent. -but, how are sparse matrices (RDF,CDF) implemented? 1) Are they Scipy matrices ?

Re: [sage-support] RDF Sparse matrix.

2010-04-30 Thread Thierry Dumont
Le 30/04/2010 18:54, Robert Bradshaw a écrit : O sage: m = matrix(RDF, 5, sparse=True) sage: type(m) type 'sage.matrix.matrix_generic_sparse.Matrix_generic_sparse' So it's our completely generic sparse implementation, stored as a dictionary of non-zero entries.

Re: [sage-support] A server that only runs a particular worksheet

2010-04-30 Thread William Stein
On Wed, Apr 28, 2010 at 7:52 AM, VictorMiller victorsmil...@gmail.com wrote: Is it possible to do the following: have SAGE be a server so that when someone goes to a particular URL that they'll attach to SAGE only running a particular worksheet (which would probably have @interactive stuff)?