#includearma::mat my_matrix; // Set the size to 3 rows and 2 columns my_matrix.set_size(3, 2);
#includeIn this example, we have two matrices `A` and `B`. We want to set the size of matrix `A` to match that of matrix `B`, which has 3 rows and 2 columns. We use `set_size` with the `n_rows` and `n_cols` attributes of matrix `B` to do this. Package library: Armadillo C++ linear algebra library.arma::mat A = {{1, 2, 3}, {4, 5, 6}}; arma::mat B = {{7, 8}, {9, 10}, {11, 12}}; // Set the size of matrix A to match matrix B A.set_size(B.n_rows, B.n_cols);