Method insert_column

src/matrix.rs:717–738

Inserts a column before the specified column (indexing starts at zero). If the matrix is empty a new matrix `n x 1` matrix is returned where `n` is the number of elements in `v`. If `pos` is greater or equal to the number columns the vector is appended as a new column. If the matrix is not empty and `v.len() != self.rows()` a `None` is returned.

(&self, pos: usize, v: &[T])

    /// If the matrix is not empty and `v.len() != self.rows()` a
    /// `None` is returned.
    pub fn insert_column(&self, pos: usize, v: &[T]) -> Option<Matrix<T>> {

        if self.empty() {
            return Matrix::from_vec(v.to_vec(), v.len(), 1);
        }

        if v.len() != self.rows() {
            return None;
        }

        let mut m = Matrix::<T>::new();
        for (i, r) in self.row_iter().enumerate() {
            let mut q = r.to_vec();
            if pos < q.len() {
                q.insert(pos, v[i].clone());
            } else {
                q.push(v[i].clone());
            }
            m.add_row(&q);
        }
        Some(m)
    }

    /// Returns a copy of the column at the specified index.
    pub fn column(&self, pos: usize) -> Option<Vec<T>> {