id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,merged,author,reviewer,upstream,work_issues,branch,commit,dependencies,stopgaps
2429,block_matrix command should be consistent with the syntax of the matrix command,jason,was,"The block matrix command uses a slightly different syntax than the matrix command, leading to confusion. It would be great to fix it so that the following examples would work. Assume that the xi variables below are matrices
{{{
sage: # Throw an error if the dimensions of the blocks don't match up correctly.
sage: # explicitly specify the positions of the blocks
sage: block_matrix([[x1,x2],[x3,x4]])
sage: block_matrix([[x1,x2,x3],[x4,x5,x6]])
sage: # dimensions are the numbers of block rows and columns
sage: block_matrix(2,3, [x1,x2,x3,x4,x5,x6])
sage: # coerce the matrix to a specific ring
sage: block_matrix(QQ,2,3,[x1,x2,x3,x4,x5,x6])
sage: # 1 and 0 should still be interpreted as the identity and zero matrices
sage: block_matrix([[x1,1],[1,x2]])
sage: # if only one dimension is given, assume the matrix is square
sage: block_matrix(QQ,2,[x1,x2,x3,x4])
sage: block_matrix(2,[x1,x2,x3,x4])
sage: # the following works now
sage: block_matrix([x1,x2,x3,x4])
}}}
",enhancement,closed,major,sage-duplicate/invalid/wontfix,linear algebra,duplicate,,jdemeyer,,,Willem Jan Palenstijn,N/A,,,,,