Re: how to use fft in c++

[Progressive]

Well, at first thank you very much!

I'm trying to implement to that and since it doesn't work I stick to a basic
try:

                DEFUN_DLD (helloworld, args, nargout,"Hello World Help String")
                {

                }

from
https://www.gnu.org/software/octave/doc/v4.0.1/Getting-Started-with-Oct_002dFiles.html
already doesn't work. I receive the following:

address@hidden:~/analysis/analyse_tree/Filter$ make clean && make
rm -f filter *.o 
g++ -c -I/usr/include/octave-4.0.2/octave -g -Wall `root-config --cflags
--libs` -fPIC -O3 -pthread -std=c++11 -Wno-deprecated-declarations -m64
-I/home/user/root/include Filter.cpp -o Filter.o
-I/home/user/analysis/analyse_tree/Filter 
In file included from /usr/include/octave-4.0.2/octave/defun-dld.h:30:0,
                 from /usr/include/octave-4.0.2/octave/oct.h:36,
                 from Filter.cpp:5:
Filter.cpp: In function ‘int main()’:
/usr/include/octave-4.0.2/octave/defun-int.h:101:10: error: expected
unqualified-id before string constant
   extern "C" \
          ^
/usr/include/octave-4.0.2/octave/defun-int.h:98:3: note: in expansion of
macro ‘DEFINE_FUNX_INSTALLER_FUN’
   DEFINE_FUNX_INSTALLER_FUN(#name, F ## name, G ## name, doc)
   ^
/usr/include/octave-4.0.2/octave/defun-dld.h:61:3: note: in expansion of
macro ‘DEFINE_FUN_INSTALLER_FUN’
   DEFINE_FUN_INSTALLER_FUN (name, doc) \
   ^
Filter.cpp:303:3: note: in expansion of macro ‘DEFUN_DLD’
   DEFUN_DLD (helloworld, FADC2_ev18_crystal_12, nargout,"Hello World Help
String")
   ^
Filter.cpp:444:1: error: expected ‘}’ at end of input
 }
 ^
Filter.cpp:257:9: warning: unused variable ‘Outputfile_filtered’
[-Wunused-variable]
  TFile *Outputfile_filtered=new TFile(outputfile_filter, "RECREATE");         
// Outputfile
         ^
Filter.cpp:444:1: error: expected ‘}’ at end of input
 }

Without DEFUN_DLD it works. The description says that the first argument of
DEFUN_DLD has to be name of the function within octave. But as it is an
example it should work though (despite it does not work, too, by changin
helloworld to fft).

What am I doing wrongly?
Thank you in advance!



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