[Rcpp-devel] Help Rcpp under ubuntu with QT4
edd at debian.org
Mon Oct 11 19:33:40 CEST 2010
On 11 October 2010 at 12:22, Dirk Eddelbuettel wrote:
| Please do not send html mail.
| On 11 October 2010 at 17:53, Paulo Trigueiros wrote:
| | I need some help on compiling the examples that come eith Rcpp under
| | ubuntu with QT4. Is it possible?<br>
| | I always get the message "Cannot find library Rcpp".<br>
| 1) That makes no sense. The Rcpp examples do not contain Qt so you cannot
| "compile under Qt 4". This is entirely independent.
| 2) The examples work. I happen to develop on Ubuntu myself.
| 3) Just change directory into the examples directory. Run make. Look at
| the generated commands, ie the arguments to g++ et al
| 4) Learn how to write .pro files for qmake and Qt. It is well documented.
| You can use the input from step 3) to do this.
| 5) And if you error is "Cannot find library Rcpp" then you trying to write
| you own framwork without understanding it. See point 4) -- you need to
| tell qmake that it needs to create a link instruction against libRcpp and
| you to tell it where to find it. Plus the rpath argument [see 3) above]
| or else you need to tell ld.so where libRcpp.so is.
| 6) One can possibly run shell commands from when qmake evaluates the .pro
| file to generate the Makefile. I have not yqt combined Rcpp and Qt,
| though I have written C++ programs with both frameworks. I expect no
| 7) Lastly, and please do not take this the wrong way: Leanrn to write better
| emails asking for help. We don't know what you did so we cannot help
On second thought, it makes even less sense.
Qt is a framework to build full apps, ie with a main() function. That would
conflict with R which has its own main().
On the other hand maybe you meant to look at RInside as you want to embed R
in a C++ application built using Qt? Should work, but haven't done it
Or maybe you want to build a module for R using Rcpp and some convenience
classes from Qt -- in which case your need to understand src/Makevars to
point to Qt header and libraries.
| Hope this helps, Dirk
| Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
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Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
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