Function matrix_from_flat 

pub fn matrix_from_flat<E>(
    rows: usize,
    cols: usize,
    elements: impl IntoIterator<Item = E>,
) -> Result<Expr, ExprShapeError>
where
    E: Into<Expr>,
    Expr: From<E>,

Constructs a row-major matrix from a flat sequence.

Errors

Returns ExprShapeError when either dimension is zero, the dimension product overflows, the element count differs from rows * cols, or an element is not scalar-valued.