# Matrix windows¶

class sage.matrix.matrix_window.MatrixWindow

Bases: object

add(A)
add_prod(A, B)
echelon_in_place()

Calculate the echelon form of this matrix, returning the list of pivot columns

element_is_zero(i, j)
get_unsafe(i, j)
matrix()

Returns the underlying matrix that this window is a view of.

matrix_window(row, col, n_rows, n_cols)

Returns a matrix window relative to this window of the underlying matrix.

ncols()
new_empty_window(nrows, ncols)
new_matrix_window(matrix, row, col, n_rows, n_cols)

This method is here only to provide a fast cdef way of constructing new matrix windows. The only implicit assumption is that self._matrix and matrix are over the same base ring (so share the zero).

nrows()
set(src)
set_to(A)

Change self, making it equal A.

set_to_diff(A, B)
set_to_prod(A, B)
set_to_sum(A, B)
set_to_zero()
set_unsafe(i, j, x)
subtract(A)
subtract_prod(A, B)
swap_rows(a, b)
to_matrix()

Returns an actual matrix object representing this view.