How to use Rcpp in Qt (with Mac) [Almost Solved]?

[newe12]

Hi!

I was searching the Qt Forum for the implementation of statistics formulas, such as 1) to convert from a Z Score to a p-value and 2) from a T Score to a p-value.

In R this is very simple, for example:
z <- 0.3874
pvalue = pnorm(-abs(z))
pvalue

or
n <- 25
t <- 2.71
pt(-(t),df=n-1)

Exists there any solution to implement such formulas in a Qt Gui Application?

I'd be very happy, if someone could give me a hint!

[A Former User]

Hi!
Do you already know GSL? http://www.gnu.org/software/gsl/

[newe12]

Thanks so far!

Well I found an approximation function for the cdf of standard normal distribution and http://dirk.eddelbuettel.com/code/rcpp/html/Rmath_8h.html

Rcpp covers a lot of statistics functionality!

What would be the easiest way to use Rcpp or Rmath.h in Qt creator (if I do not need the whole functionality of Rcpp, but just some of Rmath.h)?

[A Former User]

Hi,

that's easy. Rcpp is in the Debian and Ubuntu repositories. So the first step is to install it:
sudo apt-get install r-cran-rcpp

Next step is to create a new project or open an existing one in QtCreator. In your *.pro file add the include paths for R and Rcpp and tell the linker about the R library:

INCLUDEPATH += /usr/share/R/include
INCLUDEPATH += /usr/lib/R/site-library/Rcpp/include
LIBS += -L/usr/lib -lR

Now you're up and running. Following the example from the Rcpp introduction (http://dirk.eddelbuettel.com/code/rcpp/Rcpp-introduction.pdf, page 3):

// ...
#include <Rcpp.h>

RcppExport SEXP convolve3cpp(SEXP a, SEXP b) {
    Rcpp::NumericVector xa(a);
    Rcpp::NumericVector xb(b);
    int n_xa = xa.size(), n_xb = xb.size();
    int nab = n_xa + n_xb - 1;
    Rcpp::NumericVector xab(nab);
    for (int i = 0; i < n_xa; i++)
    for (int j = 0; j < n_xb; j++)
    xab[i + j] += xa[i] * xb[j];
    return xab;
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // your code 

    return app.exec();
}

Cheers!

[newe12]

Thanks for your helpful reply!

Well, I have got a problem with the initial task: "sudo: apt-get: command not found" - in the Terminal.
I am using a Mac OS X Yosemite.

So I have been only able to install it in R Studio... (where it runs nicely!)

But, I would like to use Rcpp in Qt creator!

Any suggestions to install and run it as it should work?

Or is there an easier way of installing it directly via Qt?

Please let me know!

[A Former User]

There is nothing as "installing it via Qt". If you have installed it in R Studio then you just need to locate the R library and the header files I mentioned above. Then adjust the paths in your *.pro file.

[newe12]

Thanks! I understand.

Well in R Studio I identified the R library with ".Library"and I got:

.Library
[1] "/Library/Frameworks/R.framework/Resources/library"

In combination with your suggestion I tried this:
INCLUDEPATH += /Users/xy/share/R/include
INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
LIBS += -L/Users/xy/lib -lR
but it was not working...

[A Former User]

Sorry, but I can't help you with Mac OS. :-(

[newe12]

Okay! Thank you very much for your help!

[A Former User]

You're welcome!

[SGaist]

Hi and welcome to devnet,

Try with -framework R in place of -lR

[newe12]

Thanks!

Well, now I have got:
INCLUDEPATH += /Users/xy/share/R/include
INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
LIBS += -L/Users/xy/Library -framework R

but I still get:
'Rcpp.h' file not found

also if change to:
LIBS += -L/Users/xy/Library/Frameworks/R.framework/

and when I typed in R Studio:
getw()

I got:
/Users/xy

Sorry, but I do not find the mistake. Any idea?

[SGaist]

It depends on how you wrote your includes

What mistake are you thinking about ?

[newe12]

I wrote my include: #include "Rcpp.h" in mainwindow.cpp.
It is not conflicting with: #include "math.h", or?

And it displays: directory not found for: LIBS += -L/Users/xy/Library/Frameworks/R.framework/ and also for: LIBS += -L/Users/xy/Library -framework R

[SGaist]

To add a path for frameworks you should user -F /Users/xy/Library/Frameworks/
The includes are generally in fwname.framework/Headers

[newe12]

Hi!

Sorry, but Qt still does not find the "Rccp.h" file. I tried to include #include "Rcpp.h" in mainwindow.cpp or in mainwindow.h. Or should I include it in main.cpp?

and additionally I wrote in the .pro-file:
HEADERS += mainwindow.h

FORMS += mainwindow.ui

INCLUDEPATH += /Users/xy/share/R/include
INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include
LIBS += -L/Users/xy/Library/Frameworks/R.framework/
INCLUDEPATH += -F/Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include

and I tried: INCLUDEPATH += "/Users/.../include" using: "..." but same result.

In RStudio it gives me:

.Library
[1] "/Library/Frameworks/R.framework/Resources/library"
getwd()
[1] "/Users/xy"

So I combined: "/Users/xy/Library/Frameworks/R.framework/Resources/library"

Unfortunately, always the same result 'Rcpp.h' not found.

Even they: https://stat.ethz.ch/pipermail/r-sig-mac/2011-May/008270.html found
"/Library/Frameworks/R.framework/Resources/library" should be alright!

Has got anyone an idea?

I just want to use 'Rcpp.h' (which I already installed via RStudio, where it loads and runs without any problems) in Qt with a Mac. :-)

[newe12]

Has anyone an idea to get Rcpp.h http://dirk.eddelbuettel.com/code/rcpp/html/Rmath_8h.html
running in Qt with a Mac?

[A Former User]

Hi again!
Can you open the directory "/Users/xy/Library/Frameworks/R.framework/Resources/library/Rcpp/include" with a file manager? Does it contain the file "Rcpp.h" ?

[newe12]

Hi,
I tried to re-install Rcpp.h:

• installing source package ‘Rcpp’ ...
  ** Paket ‘Rcpp’ erfolgreich entpackt und MD5 Summen überprüft
  ** libs
  clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include/ -I/usr/local/include -I/usr/local/include/freetype2 -I/opt/X11/include
  ...
  ...
  clang++ -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/usr/local/lib -o Rcpp.so Date.o Module.o Rcpp_init.o api.o attributes.o barrier.o -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
  installing to /Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/libs
  ** R
  ** inst
  ** preparing package for lazy loading
  ** help
  *** installing help indices
  ** building package indices
  ** installing vignettes
  ** testing if installed package can be loaded
• DONE (Rcpp)

---

then I used:
INCLUDEPATH += /Users/xy/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include
LIBS += -I/Library/Frameworks/R.framework/Resources/include
or
LIBS += -F/Library/Frameworks/R.framework/Resources/include

It still does not run!

[A Former User]

Hallo :-)

-o Rcpp.so Date.o Module.o Rcpp_init.o api.o attributes.o

I see that some object code files have been installed. But are you really sure that the file "Rcpp.h" exists in "/Users/xy/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include" ? Maybe the Rcpp project has been split in two separate packages: One package only for software that uses Rcpp binaries and a second package for developers that includes all the header files (so called "-dev" package)?