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