Function builtin_matrix 

fn builtin_matrix(
    args: &[RValue],
    named: &[(String, RValue)],
) -> Result<RValue, RError>

Create a matrix from the given data.

Fills column-by-column by default. Use byrow = TRUE for row-major fill.

@param data vector of values to fill the matrix @param nrow number of rows @param ncol number of columns @param byrow if TRUE, fill by rows instead of columns @param dimnames list of row and column name vectors @return matrix (vector with dim and class attributes)