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 | 1 | initial version |
The method matrix_from_rows_and_columns will do just this; it is especially helpful if you don't want to use consecutive rows and/or columns:
sage: M = matrix(4, 4, range(16))
sage: M
[ 0 1 2 3]
[ 4 5 6 7]
[ 8 9 10 11]
[12 13 14 15]
sage: M.matrix_from_rows_and_columns([0,3], [1])
[ 1]
[13]
sage: M.matrix_from_rows_and_columns([0,3], [1,2])
[ 1 2]
[13 14]
The arguments are a pair: a list of rows to use and a list of columns to use.
| | 2 | No.2 Revision |
The method matrix_from_rows_and_columns will do just this; it is especially helpful if you don't want to use consecutive rows and/or columns:
sage: M = matrix(4, 4, range(16))
sage: M
[ 0 1 2 3]
[ 4 5 6 7]
[ 8 9 10 11]
[12 13 14 15]
sage: M.matrix_from_rows_and_columns([0,3], [1])
[ 1]
[13]
sage: M.matrix_from_rows_and_columns([0,3], [1,2])
[ 1 2]
[13 14]
The arguments are a pair: a list of rows to use and a list of columns to use.use. The submatrix method can be used (in addition to the answers already provided) if you want consecutive rows and columns.
