CODEWITHSUNDEEP
c++rrcpp
user1436187
user1436187

Reputation: 3376

Erase matrix element and give it new size and elements in rcpp

Example in R:

A: a = matrix(1:100,10,10)

B: a = matrix(1:9,3,3)

C: a = matrix(1:400,20,20)

What is the equivalent rcpp code for this simple example?

a is always one variable with mutable contents and size.

In A, I created the matrix a with this rcpp code:

NumericMatrix a(10,10)

And fill it with sequence of number from 1 to 100. I want to resize this matrix with a command like this:

a(3,3)

or

a(20,20)

and put 1 to 9 or 1 to 400 in it.

Upvotes: 4

Views: 388

Answers (1)

user1436187
user1436187

Reputation: 3376

The RcppArmadillo can solve the problem:

arma::mat m1 = arma::eye<arma::mat>( 10, 10 ) ;

m1.set_size(20,20);
m1.set_size(3,3);

I do not know if it is possible in rcpp.

Upvotes: 2

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