Rust, Design Patterns, Matrix Factorization, Numerical Methods, Software Engineering.
None, data: None, } } pub fn rows(mut self, rows: usize) -> Self { self.rows = if rows > 0 { Some(rows) } else { None }; self } pub fn cols(mut self, cols: usize) -> Self { self.cols = if cols > 0 { Some(cols) } else { None }; self } pub fn data(mut self, data: Vec<T>) -> Self { self.data = if