Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppAlglibExample2/CppAlglibExample2.pro


include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }



SOURCES += main.cpp



#

#

# alglib

#

#



unix {

  message(Lubuntu: alglib not tested)



}



win32 {

  message(Windows: alglib: include path)

  INCLUDEPATH += ../../Libraries/alglib-3.8.0/src



SOURCES += \

    ../../Libraries/alglib-3.8.0/src/statistics.cpp \

    ../../Libraries/alglib-3.8.0/src/specialfunctions.cpp \

    ../../Libraries/alglib-3.8.0/src/solvers.cpp \

    ../../Libraries/alglib-3.8.0/src/optimization.cpp \

    ../../Libraries/alglib-3.8.0/src/linalg.cpp \

    ../../Libraries/alglib-3.8.0/src/interpolation.cpp \

    ../../Libraries/alglib-3.8.0/src/integration.cpp \

    ../../Libraries/alglib-3.8.0/src/fasttransforms.cpp \

    ../../Libraries/alglib-3.8.0/src/diffequations.cpp \

    ../../Libraries/alglib-3.8.0/src/dataanalysis.cpp \

    ../../Libraries/alglib-3.8.0/src/ap.cpp \

    ../../Libraries/alglib-3.8.0/src/alglibmisc.cpp \

    ../../Libraries/alglib-3.8.0/src/alglibinternal.cpp



HEADERS += \

    ../../Libraries/alglib-3.8.0/src/statistics.h \

    ../../Libraries/alglib-3.8.0/src/specialfunctions.h \

    ../../Libraries/alglib-3.8.0/src/solvers.h \

    ../../Libraries/alglib-3.8.0/src/optimization.h \

    ../../Libraries/alglib-3.8.0/src/linalg.h \

    ../../Libraries/alglib-3.8.0/src/interpolation.h \

    ../../Libraries/alglib-3.8.0/src/integration.h \

    ../../Libraries/alglib-3.8.0/src/fasttransforms.h \

    ../../Libraries/alglib-3.8.0/src/diffequations.h \

    ../../Libraries/alglib-3.8.0/src/dataanalysis.h \

    ../../Libraries/alglib-3.8.0/src/ap.h \

    ../../Libraries/alglib-3.8.0/src/alglibmisc.h \

    ../../Libraries/alglib-3.8.0/src/alglibinternal.h

}

./CppAlglibExample2/main.cpp


///Adapted from http://www.alglib.net/translator/man/manual.cpp.html#lsfit_d_lin%20example



#include <cassert>

#include <iostream>

#include "interpolation.h"



///Result should be {a,b}, as a linear trendline has the equation

///y = a.x + b, but I could not find out how to obtain b

std::pair<double,double> FitLinear(

  const std::vector<double>& xs,

  const std::vector<double>& ys)

{

  alglib::real_1d_array y;

  y.setcontent(ys.size(), &ys[0]);



  alglib::real_2d_array fmatrix;

  fmatrix.setcontent(xs.size(),1,&xs[0]);



  alglib::ae_int_t info;

  alglib::real_1d_array c;

  alglib::lsfitreport rep;



  alglib::lsfitlinear(y, fmatrix, info, c, rep);



  assert(info == 1 && "task is solved successfully");



  ///Result should be {a,b}, as a linear trendline has the equation

  ///y = a.x + b, but I could not find out how to obtain b

  return std::make_pair(c[0],c[0]);

}



int main()

{

  const std::vector<double> x { 0.606531,0.670320,0.740818,0.818731,0.904837,1.000000,1.105171,1.221403,1.349859,1.491825,1.648721 };

  const std::vector<double> y { 1.133719, 1.306522, 1.504604, 1.554663, 1.884638, 2.072436, 2.257285, 2.534068, 2.622017, 2.897713, 3.219371 };

  const std::pair<double,double> p = FitLinear(x,y);



  assert(p.first > 1.98650 && p.first < 1.98651);

  assert(p.second > 1.98650 && p.second < 1.98651);

}

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(C++) AlglibExample2

Technical facts

Qt project file: ./CppAlglibExample2/CppAlglibExample2.pro

./CppAlglibExample2/main.cpp