I agree with Didier's comments. Judging from emails to the GAP support list (Which also has such a function), a block matrix function will be frequently used. I think it should be well-documented.
On 1/10/08, didier deshommes <[EMAIL PROTECTED]> wrote: > > On Jan 9, 2008 3:23 AM, Robert Bradshaw <[EMAIL PROTECTED]> > wrote: > > > > http://sagetrac.org/sage_trac/ticket/1732 > > 2 questions about the patch: > * Why is this function named block_sum? What are we summing? > * Why are we limited to 4 arguments? Ideally, I would love to pass a > list to this function and have it concatenate each matrix in the list > (horizontally in the following case): > A.block_matrix([A_1, A_2, ..., A_n]) > > You could pass the functions an argument, indicating the number of > rows (or columns) you want so that you can do things like > A = [ A1 A2] > [ A3 A4] > > like this: > A=block_matrix([A1,A2,A3,A4],num_cols=2*3,num_rows=None). Here each A > is 3x3 and we are concatenating 2 of them in each row. > > On a more general note, block_sum as of 2.9.3 is really constructing a > block diagonal matrix, isn't it? Why not call it block_diagonal? Of > course, for now, it's only using one argument, why not pass it a list > of matrices? > > Thoughts? > > didier > > > > > > > On Jan 8, 2008, at 4:27 AM, vgermrk wrote: > > > > > > > > Is there a way to construct block matrices in SAGE? > > > Not just the "block_sum", "augment" and "stack" functions. > > > > > > As an example, let A, B, C, D be matrices and i want to construct a > > > matrix like E=[[A,B],[C,D]] > > > > > > Such a feature would be very nice. > > > > > > -vgermrk- > > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
