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对 FFTW 的 c++ 封装

This archive contains Windows binaries of fftw-3.0.1, compiled using
the Intel compiler, icc-7.1 /O3 /G7.  

These files were contributed by Alessio Massaro.

See http://www.fftw.org for the FFTW source code and documentation.

This is file fftw-3.0.1-w32-pl1.zip (patch level 1).  

If you downloaded file fftw-3.0.1-w32.zip, please upgrade to
fftw-3.0.1-w32-pl1.zip.  In fftw-3.0.1-w32.zip, fftw*_execute_dft_c2r
are missing in the Win32 binaries export symbol table.  The new
archive fixes this problem.