On 7 September 2011 at 14:46, Noah Silverman wrote:
| Hi,
|
|
| I'm writing a function using Rcpp through inline. This function will be a
| filter on an incoming data stream.
|
| I need to keep the past several data values so that they are accessible to the
| function each time it is called. This is easy to do with a data structure in
| R (and then passing subsequent structure to the C++ function) but that seems
| rather slow. Is there some way to define a persistent object that is
| accessible to an Inline function using Rcpp?
|
|
| If the code was in pure C++, it would be trivial to have an object and then
| just pass a pointer to that object. I can't figure out how to do the same
| thing with R+Rcpp+inline.
i) Read up on the 'static' argument for variable declarations in C and C++.
ii) Rethink your architecture, maybe have an 'agent' operate on the stream
and report to a persisting 'broker' that keeps state.
iii) Read up on persisting data as a general issue.
This has little to do with Rcpp and your preference of inline over packages,
but rather with how to think in code (and/or C++) and that is NOT a topic
covered on this list.
Let's please try to keep focus on Rcpp and related questions here.
Dirk
| Thanks!
|
| --
| Noah Silverman
| UCLA Department of Statistics
| 8117 Math Sciences Building #8208
| Los Angeles, CA 90095
|
|
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--
Two new Rcpp master classes for R and C++ integration scheduled for
New York (Sep 24) and San Francisco (Oct 8), more details are at
http://dirk.eddelbuettel.com/blog/2011/08/04#rcpp_classes_2011-09_and_2011-10
http://www.revolutionanalytics.com/products/training/public/rcpp-master-class.php
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