Functions for changing the base ring of matrices quickly¶
- sage.matrix.change_ring.integer_to_real_double_dense(A)[source]¶
- Fast conversion of a matrix over the integers to a matrix with real double entries. - INPUT: - A– a dense matrix over the integers
 - OUTPUT: a dense real double matrix - EXAMPLES: - sage: a = matrix(ZZ,2,3,[-2,-5,3,4,8,1030339830489349908]) sage: a.change_ring(RDF) [ -2.0 -5.0 3.0] [ 4.0 8.0 1.0303398304893499e+18] sage: import sage.matrix.change_ring sage: sage.matrix.change_ring.integer_to_real_double_dense(a) [ -2.0 -5.0 3.0] [ 4.0 8.0 1.0303398304893499e+18] - >>> from sage.all import * >>> a = matrix(ZZ,Integer(2),Integer(3),[-Integer(2),-Integer(5),Integer(3),Integer(4),Integer(8),Integer(1030339830489349908)]) >>> a.change_ring(RDF) [ -2.0 -5.0 3.0] [ 4.0 8.0 1.0303398304893499e+18] >>> import sage.matrix.change_ring >>> sage.matrix.change_ring.integer_to_real_double_dense(a) [ -2.0 -5.0 3.0] [ 4.0 8.0 1.0303398304893499e+18]