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4.4.4 intmat operations
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+ addition with intmat or int; the int is converted into a diagonal intmat
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- negation or subtraction with intmat or int; the int is converted into a diagonal intmat
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* multiplication with intmat, intvec, or int; the int is converted into a diagonal intmat
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div,/ division of entries in the integers (omitting the remainder)
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%, mod entries modulo int (remainder of the division)
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<>,== comparison
- 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 |