/* (non-Javadoc)
* @see rationals.algebra.SemiRing#plus(rationals.algebra.SemiRing)
*/
public SemiRing plus(SemiRing s2) {
if (s2 == null) throw new IllegalArgumentException("Null argument");
Matrix o = (Matrix) s2; // maybe ClassCastException
if (col != o.col || line != o.line)
throw new IllegalArgumentException(
"Incompatible matrices dimensions : cannot add non square matrices");
int l = line;
int c = col;
Matrix res = Matrix.zero(l, c, matrix[0][0]);
for (int i = 0; i < l; i++)
for (int j = 0; j < c; j++) res.matrix[i][j] = matrix[i][j].plus(o.matrix[i][j]);
return res;
}
/* (non-Javadoc)
* @see rationals.algebra.SemiRing#mult(rationals.algebra.SemiRing)
*/
public SemiRing mult(SemiRing s2) {
if (s2 == null) throw new IllegalArgumentException("Null argument");
Matrix o = (Matrix) s2; // maybe ClassCastException
if (col != o.line) throw new IllegalArgumentException("Incompatible matrices dimensions");
int l = line; // lines
int c = o.col; // cols
int m = col;
Matrix res = Matrix.zero(l, c, matrix[0][0]);
for (int i = 0; i < l; i++) {
for (int j = 0; j < c; j++)
for (int k = 0; k < m; k++) {
if (k == 0) res.matrix[i][j] = matrix[i][k].mult(o.matrix[k][j]);
else res.matrix[i][j] = res.matrix[i][j].plus(matrix[i][k].mult(o.matrix[k][j]));
}
}
return res;
}