Hi,
If we declare the following toy function where a numeric matrix is passed by
reference,
it works as expected, the matrix m is modified "in place":
cppFunction('
mat m2(mat& m) {
m=m*2;
return(m);
}', depends="RcppArmadillo", inc="using namespace arma;")
m=matrix(1:4, 2)+pi
m2(m)
[,1] [,2]
[1,] 8.283185 12.28319
[2,] 10.283185 14.28319
m
[,1] [,2]
[1,] 8.283185 12.28319
[2,] 10.283185 14.28319
But if we pass to imat type, the call by reference is no more functionning:
cppFunction('
imat im2(imat& m) {
m=m*2;
return(m);
}', depends="RcppArmadillo", inc="using namespace arma;")
im=matrix(1:4, 2)
im2(im)
[,1] [,2]
[1,] 2 6
[2,] 4 8
im
[,1] [,2]
[1,] 1 3
[2,] 2 4
The original matrix im remains as it was.
You can easyly verify that the same is true for ivec type.
Is it intended behaviour?
Serguei.
R version 3.2.0 (2015-04-16)
> packageVersion("Rcpp")
[1] ‘0.12.0’
> packageVersion("RcppArmadillo")
[1] ‘0.5.500.2.0’
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