4.12.3 matrix type cast

Syntax:

matrix ( expression )
matrix ( expression, int_n, int_m )

Type:

matrix

Purpose:

Converts expression to a matrix, where expression must be of type int, intmat, intvec, number, poly, ideal, vector, module, or matrix. If int_n and int_m are supplied, then they specify the dimension of the matrix. Otherwise, the size (resp. dimensions) of the matrix is determined by the size (resp. dimensions) of the expression.

Example:

ring r=32003,(x,y,z),dp; matrix(x); ==> _[1,1]=x matrix(x, 1, 2); ==> _[1,1]=x ==> _[1,2]=0 matrix(intmat(intvec(1,2,3,4), 2, 2)); ==> _[1,1]=1 ==> _[1,2]=2 ==> _[2,1]=3 ==> _[2,2]=4 matrix(_, 2, 3); ==> _[1,1]=1 ==> _[1,2]=2 ==> _[1,3]=0 ==> _[2,1]=3 ==> _[2,2]=4 ==> _[2,3]=0 matrix(_, 2, 1); ==> _[1,1]=1 ==> _[2,1]=3