openwebwork/webwork-open-problem-library — pull request #60 by gajennings (2014-02-10 00:11:16+00:00)
Title: Fix column spacing in matrix problems

The text-mode display_matrix function in PGmatrixmacros.pl leaves very little space between columns when it displays a matrix. As a result some matrices become hard to read. To fix this I replaced \{display_matrix($m)\} with the math-mode function\(\{display_matrix_mm($m)\}\) in several Rochester and TCNJ problems.