getDiag method
Returns the diagonal of a matrix matr
Its length is the minimum of the row or column size of matr
.
Implementation
List<double> getDiag(List<List<double>> matr) {
int n = math.min(matr.length, matr[0].length), i;
List<double> ret = List(n);
for (i = n - 1; i >= 1; --i) {
ret[i] = matr[i][i];
--i;
ret[i] = matr[i][i];
}
if (i == 0) {
ret[0] = matr[0][0];
}
return ret;
}