stdvectors-package {stdvectors}

C++ Standard Library Vectors in R

Description

Allows the creation and manipulation of C++ std::vector's in R.

Details

Package:	stdvectors
Type:	Package
Version:	0.0.5
Date:	2017-02-20
License:	GPL (>= 2)

This package allows the creation and manipulation of C++ std::vector's in R. std::vector's are dynamically allocated arrays, which are especially helpful when you need to fill a huge vector (e.g. in a loop) but you don't know the size in advance.

Author(s)

Marco Giuliano

Maintainer: Marco Giuliano <[e-mail]>

References

cpp reference page : http://en.cppreference.com/w/

Examples

  # create a stdvector
  sv <- stdvectorCreate('integer')
  # add 100 values to it
  for(i in 1:100){
    # note that sv is modified in-place
    stdvectorPushBack(sv,i)
  }
  # get a normal R vector from the stdvector
  v <- stdvectorToVector(sv)

  ## Not run: 
  
    # check the time difference:
    # the first method takes around 2-3 s
    # the second method takes less than 0.1 s
    system.time({
        v <- integer()
        for(i in 1:100000){
          v[[length(v)+1]] <- i
        }
      }
    )
    system.time({
        v <- stdvectorCreate('integer')
        for(i in 1:100000){
          stdvectorPushBack(v,i)
        }
      }
    )

  
## End(Not run)