Sage Reference Manual: Matrices and Spaces of Matrices - Mirrors

Sage Reference Manual: Matrices and Spaces of Matrices, Release 6.1.1
[ 5 7]
[ 9 11]
dcols can be a tuple. But only the underlying set of indices matters.
sage: A.delete_columns((2,0,2))
[ 1 3]
[ 5 7]
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The default is to check whether any index in dcols is out of range.
sage: A.delete_columns([-1,2,4])
Traceback (most recent call last):
...
IndexError: [4, -1] contains invalid indices.
sage: A.delete_columns([-1,2,4], check=False)
[ 0 1 3]
[ 4 5 7]
[ 8 9 11]
TESTS:
The list of indices is checked.
sage: A.delete_columns(’junk’)
Traceback (most recent call last):
...
TypeError: The argument must be a list or a tuple, not junk
AUTHORS:
• Wai Yan Pong (2012-03-05)
delete_rows(drows, check=True)
Return the matrix constructed from deleting the rows with indices in the drows list.
INPUT:
•drows - list of indices of rows to be deleted from self.
•check - checks whether any index in drows is out of range. Defaults to True.
SEE ALSO: The methods delete_columns() and matrix_from_rows() are related.
EXAMPLES:
sage: A = Matrix(4,3,range(12)); A
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sage: A.delete_rows([0,2])
[ 3 4 5]
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drows can be a tuple. But only the underlying set of indices matters.
sage: A.delete_rows((2,0,2))
[ 3 4 5]
[ 9 10 11]
102 Chapter 6. Base class for matrices, part 1