transpose method
Implementation
Matrix transpose() {
final List<Vector> cols = <Vector>[];
for (int j = 0; j < ncols; j++) {
final List<double> col = <double>[];
for (int i = 0; i < nrows; i++) {
col.add(_rows[i][j]);
}
cols.add(Vector.fromList(col));
}
return Matrix.fromRows(cols);
}