Macro extendr_api::prelude::concat
macro_rules! concat { () => { ... }; ($([$($v:expr),* $(,)?] ),* $(,)?) => { ... }; }
Expand description
Concatenates the matrices in each row horizontally, then concatenates the results vertically.
concat![[a0, a1, a2], [b1, b2]]
results in the matrix
[a0 | a1 | a2][b0 | b1]