4.8.4 intmat operations

+

addition with intmat or int; the int is converted into a diagonal intmat

-

negation or subtraction with intmat or int; the int is converted into a diagonal intmat

*

multiplication with intmat, intvec, or int; the int is converted into a diagonal intmat

div,/

division of entries in the integers (omitting the remainder)

%, mod

entries modulo int (remainder of the division)

<>, ==

comparators

intmat_expression [ intvec_expression, intvec_expression ]

is an intmat entry, where the first index indicates the row and the second the column

Example:

intmat m[2][4] = 1,0,2,4,0,1,-1,0,3,2,1,-2; m; ==> 1,0,2,4, ==> 0,1,-1,0 m[2,3]; // entry at row 2, col 3 ==> -1 size(m); // number of entries ==> 8 intvec v = 1,0,-1,2; m * v; ==> 7,1 typeof(_); ==> intvec intmat m1[4][3] = 0,1,2,3,v,1; intmat m2 = m * m1; m2; // 2 x 3 intmat ==> -2,5,4, ==> 4,-1,-1 m2*10; // multiply each entry of m with 10; ==> -20,50,40, ==> 40,-10,-10 -m2; ==> 2,-5,-4, ==> -4,1,1 m2 % 2; ==> 0,1,0, ==> 0,1,1 m2 div 2; ==> -1,2,2, ==> 2,-1,-1 m2[2,1]; // entry at row 2, col 1 ==> 4 m1[2..3,2..3]; // submatrix ==> 1 0 2 1 m2[nrows(m2),ncols(m2)]; // the last entry of intmat m2 ==> -1