Base class for dense matrices


sage: R.<a,b> = QQ[]
sage: m = matrix(R,2,[0,a,b,b^2])
sage: TestSuite(m).run()
class sage.matrix.matrix_dense.Matrix_dense

Bases: sage.matrix.matrix.Matrix

The initialization routine of the Matrix base class ensures that it sets the attributes self._parent, self._base_ring, self._nrows, self._ncols. It sets the latter ones by accessing the relevant information on parent, which is often slower than what a more specific subclass can do.

Subclasses of Matrix can safely skip calling Matrix.__init__ provided they take care of initializing these attributes themselves.

The private attributes self._is_immutable and self._cache are implicitly initialized to valid values upon memory allocation.


sage: import sage.matrix.matrix0
sage: A = sage.matrix.matrix0.Matrix(MatrixSpace(QQ,2))
sage: type(A)
<type 'sage.matrix.matrix0.Matrix'>

Returns the antitranspose of self, without changing self.


sage: A = matrix(2,3,range(6)); A
[0 1 2]
[3 4 5]
sage: A.antitranspose()
[5 2]
[4 1]
[3 0]
sage: A.subdivide(1,2); A
[0 1|2]
[3 4|5]
sage: A.antitranspose()

Returns the transpose of self, without changing self.

EXAMPLES: We create a matrix, compute its transpose, and note that the original matrix is not changed.

sage: M = MatrixSpace(QQ,  2)
sage: A = M([1,2,3,4])
sage: B = A.transpose()
sage: print B
[1 3]
[2 4]
sage: print A
[1 2]
[3 4]

.T is a convenient shortcut for the transpose:

sage: A.T
[1 3]
[2 4]
sage: A.subdivide(None, 1); A
sage: A.transpose()
[1 3]
[2 4]

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