examples/example03.cpp · jjzhang166/NumCpp

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numcpp

examples

example03.cpp

example03.cpp 1.78 KB

#include <numcpp.h>
using namespace numcpp;

int main()
{
 // create Shepp Logan phantom (type Array<double>)
 auto x = phantom(256);

// calculate the absolute value of the FFT of x
 // the eval call is necessary as abs is an expression template
 auto y = eval(log(abs(fftshift(fft(x)))));

// export x and y to image files (pdf/png) using different colormaps
 export_image( x, "shepp_logan_phantom.pdf", colormaps::winter);
 export_image( y, "shepp_logan_phantom_fft.png");

// export x and y into the same hdf5 file
 auto file = h5create("shepp_logan_phantom.h5");
 h5write( x, file, "/shepp_logan" );
 h5write( y, file, "/shepp_logan_fft" );
 h5close(file);

// export x into a simple binary file
 tofile( x, "shepp_logan_phantom.dat");
}

/*!
@page example03 Data and Image Export Example
Example showing the data and image export capabilities of NumCpp.

NumCpp uses the Cairo graphics library for exporting arrays as images.

@code
#include <numcpp.h>
using namespace numcpp;

int main()
{
 // create Shepp Logan phantom (type Array<double>)
 auto x = phantom(256);

// calculate the absolute value of the FFT of x
 // the eval call is necessary as abs is an expression template
 auto y = eval(log(abs(fftshift(fft(x)))));

// export x and y to image files (pdf/png) using different colormaps
 export_image( x, "shepp_logan_phantom.pdf", colormaps::winter);
 export_image( y, "shepp_logan_phantom_fft.png");

// export x and y into the same hdf5 file
 auto file = h5create("shepp_logan_phantom.h5");
 h5write( x, file, "/shepp_logan" );
 h5write( y, file, "/shepp_logan_fft" );
 h5close(file);

// export x into a simple binary file
 tofile( x, "shepp_logan_phantom.dat");
}
@endcode

The generate PDF file contain the following images:

@image html exampleExport.png

一键复制编辑原始数据按行查看历史

Tobias Knopp 提交于 2013年08月04日 01:18 +08:00 . rewrite of numcpp

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#include <numcpp.h>
using namespace numcpp;

int main()
{
 // create Shepp Logan phantom (type Array<double>)
 auto x = phantom(256);

 // calculate the absolute value of the FFT of x
 // the eval call is necessary as abs is an expression template
 auto y = eval(log(abs(fftshift(fft(x)))));

 // export x and y to image files (pdf/png) using different colormaps
 export_image( x, "shepp_logan_phantom.pdf", colormaps::winter);
 export_image( y, "shepp_logan_phantom_fft.png");

 // export x and y into the same hdf5 file
 auto file = h5create("shepp_logan_phantom.h5");
 h5write( x, file, "/shepp_logan" );
 h5write( y, file, "/shepp_logan_fft" );
 h5close(file);

 // export x into a simple binary file
 tofile( x, "shepp_logan_phantom.dat");
}

/*!
@page example03 Data and Image Export Example
Example showing the data and image export capabilities of NumCpp.

NumCpp uses the Cairo graphics library for exporting arrays as images.

@code
#include <numcpp.h>
using namespace numcpp;

int main()
{
 // create Shepp Logan phantom (type Array<double>)
 auto x = phantom(256);

 // calculate the absolute value of the FFT of x
 // the eval call is necessary as abs is an expression template
 auto y = eval(log(abs(fftshift(fft(x)))));

 // export x and y to image files (pdf/png) using different colormaps
 export_image( x, "shepp_logan_phantom.pdf", colormaps::winter);
 export_image( y, "shepp_logan_phantom_fft.png");

 // export x and y into the same hdf5 file
 auto file = h5create("shepp_logan_phantom.h5");
 h5write( x, file, "/shepp_logan" );
 h5write( y, file, "/shepp_logan_fft" );
 h5close(file);

 // export x into a simple binary file
 tofile( x, "shepp_logan_phantom.dat");
}
@endcode

The generate PDF file contain the following images:

@image html exampleExport.png

*/