extern crate nalgebra as na; use na::{DMatrix, Matrix2x3, RowVector3, Vector2}; fn main() { // All the following matrices are equal but constructed in different ways. let m = Matrix2x3::new(1.1, 1.2, 1.3, 2.1, 2.2, 2.3); let m1 = Matrix2x3::from_rows(&[ RowVector3::new(1.1, 1.2, 1.3), RowVector3::new(2.1, 2.2, 2.3), ]); let m2 = Matrix2x3::from_columns(&[ Vector2::new(1.1, 2.1), Vector2::new(1.2, 2.2), Vector2::new(1.3, 2.3), ]); let m3 = Matrix2x3::from_row_slice(&[1.1, 1.2, 1.3, 2.1, 2.2, 2.3]); let m4 = Matrix2x3::from_column_slice(&[1.1, 2.1, 1.2, 2.2, 1.3, 2.3]); let m5 = Matrix2x3::from_fn(|r, c| (r + 1) as f32 + (c + 1) as f32 / 10.0); let m6 = Matrix2x3::from_iterator([1.1f32, 2.1, 1.2, 2.2, 1.3, 2.3].iter().cloned()); assert_eq!(m, m1); assert_eq!(m, m2); assert_eq!(m, m3); assert_eq!(m, m4); assert_eq!(m, m5); assert_eq!(m, m6); // All the following matrices are equal but constructed in different ways. // This time, we used a dynamically-sized matrix to show the extra arguments // for the matrix shape. let dm = DMatrix::from_row_slice( 4, 3, &[1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0], ); let dm1 = DMatrix::from_diagonal_element(4, 3, 1.0); let dm2 = DMatrix::identity(4, 3); let dm3 = DMatrix::from_fn(4, 3, |r, c| if r == c { 1.0 } else { 0.0 }); let dm4 = DMatrix::from_iterator( 4, 3, [ // Components listed column-by-column. 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, ] .iter() .cloned(), ); assert_eq!(dm, dm1); assert_eq!(dm, dm2); assert_eq!(dm, dm3); assert_eq!(dm, dm4); }