created a shared library(.so ) using matlab engine but unable to call it from a program

i created a cpp file to call a sorting function in matlab through matlab engine. i built it as a .so file. The library files & the main are attached herewith

call_matlab_processing.h

int call_matlab_processing(double array[],int sorted_indices[], int size_array);

call_matlab_processing.cpp

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "engine.h"
#include <iostream>

int call_matlab_processing(double array[],int sorted_indices[], int size_array)
{
  // its just a sorting algo, sorting being implemented by matlab
  double * sorted;
  double *indices;
      //
  Engine *ep;
  mxArray *T = NULL, *result = NULL, *indices_matlab=NULL;
  if (!(ep = engOpen(""))) {
    fprintf(stderr, "\nCan't start MATLAB engine\n");
    return 1;
  }
  T = mxCreateDoubleMatrix(1,size_array, mxREAL);
  memcpy((void *)mxGetPr(T), (void *)array, size_array*sizeof(double));
      //
  engPutVariable(ep, "T", T);
  engEvalString(ep, "[D,I] = sort(T,'descend')");
  engEvalString(ep, ";");
  engEvalString(ep, "figure,plot(D);");
  engEvalString(ep, "dlmwrite('myFile.txt',I)");
  result = engGetVariable(ep,"D");
  indices_matlab = engGetVariable(ep,"I");
      //
  sorted=(double *)mxGetData(result);
  indices=(double *)mxGetData(indices_matlab);// casting as int * gave wrong results
      //
  for(int i = 0; i < size_array;i++)
  {
    array[i]=*sorted;
    sorted_indices[i]=*indices;
    sorted++;
    indices++;
  }
      //
  int goahead=fgetc(stdin);
      //
  mxDestroyArray(T);
  mxDestroyArray(result);
  mxDestroyArray(indices_matlab);
      //
  engEvalString(ep, "close;");
  engClose(ep);
      //
  return 0;
}

so: libcall_matlab_processing

main.cpp:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <iostream>
#define  BUFSIZE 256
#include <call_matlab_processing.h>
int main()
{
  int size_array=10;
      //
  double array[10]={ 10, 5, 12, 27, 93, 19, 1, 26, 58, 74 };
  int sorted_indices[10]={1,2,3,4,5,6,7,8,9,10};
      //
  int result=call_matlab_processing(array,sorted_indices,10);
  for (int i=0;i<10;i++)
  {
    std::cout << "sorted_array= " <<array[i]<< " indices="<< sorted_indices[i] <<std::endl;
  }
      //
  std::cout << "Done"<< std::endl;
  return EXIT_SUCCESS;
}

main.cpp calls the above .so file. when i tried to build main i got so many errors: bin/ld: warning: libut.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libeng.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmat.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libeng.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwcpp11compat.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libeng.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwresource_core.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwi18n.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwfl.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwMATLAB_res.so, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_date_time.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_signals.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_system.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_thread.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_log.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libboost_log_setup.so.1.49.0, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libicudata.so.49, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) make[2]: Leaving directory `/home/shome/temp_codes/matlab_cpp_interface_codes/matlab_sort_using_lib/build' /usr/bin/ld: warning: libicuuc.so.49, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libicui18n.so.49, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libicuio.so.49, needed by //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so, not found (try using -rpath or -rpath-link) //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::catenate::emptyArrayColumnsDimensionMismatch::emptyArrayColumnsDimensionMismatch()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `fl::except::IUserException::ToUstringImpl() const' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::legacy_two_part::badformat_mx::badformat_mx()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `resource_core::BaseMsgID::getName() const' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::legacy_two_part::subsassignnumelmismatch::subsassignnumelmismatch()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `ucnv_fromUChars_49' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `ucnv_getNextUChar_49' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `ut_ghash_query' make[1]: Leaving directory `/home/shome/temp_codes/matlab_cpp_interface_codes/matlab_sort_using_lib/build' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `fl::i18n::to_ustring(char const*)' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::legacy_two_part::badopt::badopt()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `utLogWarning(utWarningManagerContext*, std::string const&, std::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t> > const&, __va_list_tag*, std::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t> > const&, bool)' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `typeinfo for fl::except::IUserException' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MathWorks::I18N::FromUTF16Converter::FromUTF16Converter(char16_t const*, int, char const*)' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `fl::filesystem::get_install_path()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::legacy_two_part::nocomplex::nocomplex()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::checkDimCommon::nonnegativeSize::nonnegativeSize()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::checkDimCommon::complexSize::complexSize()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::matrix::accessBadTypeIndices::accessBadTypeIndices(std::string const&, std::string const&)' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::legacy_two_part::Serialize::Serialize(std::string const&, std::string const&)' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `typeinfo for fl::except::IException' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `utf16_strlen_lim' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `utf16_strcpy' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::colon::logicalInput::logicalInput()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::catenate::opaqueDimensionMismatch::opaqueDimensionMismatch()' //usr/local/MATLAB/R2014a/bin/glnxa64/libeng.so: undefined reference to `utF2cstr' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::matrix::moreSubsAssignDimMismatch::moreSubsAssignDimMismatch()' //usr/local/MATLAB/R2014a/bin/glnxa64/libmx.so: undefined reference to `MATLAB::Cell2Str

[Titus Edelhofer]

Maybe you could comment on the answers given to you in the original question before posting new ones ...?

[shome]

new to matlab forums. getting used to it. accepted the right answer for previous question thanx

[Titus Edelhofer]

No problem. I've formatted the question so that it's easier to read.