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4.6.4 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
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