%general-entities; ]> $LastChangedBy$ $Date$ fftw FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data (as well as of even/odd data, i.e. the discrete cosine/sine transforms or DCT/DST). &lfs91_checked; Package Information Download (HTTP): Download (FTP): Download MD5 sum: &fftw-md5sum; Download size: &fftw-size; Estimated disk space required: &fftw-buildsize; Estimated build time: &fftw-time; User Notes: We build fftw three times for different libraries in different numerical precisions: the default double precision floating point, the older 32-bit (single precision) version named float which sacrifices precision for speed, and the long double which offers increased precision at the cost of slower execution. The first build is for double precision arithmetic. Install fftw by running the following commands: ./configure --prefix=/usr \ --enable-shared \ --enable-threads \ --enable-sse2 \ --enable-avx && make To test the results, issue: make check. On 32-bit systems, the tests can take substantially longer than they would on 64-bit machines. Now, as the root user: make install Now build single precision: make clean && ./configure --prefix=/usr \ --enable-shared \ --enable-threads \ --enable-sse2 \ --enable-avx \ --enable-float && make As the root user: make install Finally, build long double precision: make clean && ./configure --prefix=/usr \ --enable-shared \ --enable-threads \ --enable-long-double && make As the root user: make install --enable-shared: Use shared libs instead of static libs. --enable-threads: This enables libfftw3_threads.so to be compiled. It is used by e.g. the gimp plugin from G'MIC. --enable-float: This enables building the library that uses single precision floating point arithmetic. It is faster but less precise than the default double precision library. The library will be called libfftw3f.so needed by . --enable-long-double: This enables building the library that uses higher precision long-double floating point arithmetic. The library will be called libfftw3l.so. Installed Programs Installed Libraries Installed Directories fftw-wisdom and fftw-wisdom-to-conf libfftw3.so, libfftw3_threads.so, libfftw3f.so, libfftw3f_threads.so, libfftw3l.so and libfftw3l_threads.so None Short Descriptions fftw-wisdom is a utility to generate FFTW wisdom files, which contain saved information about how to optimally compute (Fourier) transforms of various sizes. fftw-wisdom fftw-wisdom-to-conf is a utility to generate C configuration routines from FFTW wisdom files, where the latter contain saved information about how to optimally compute (Fourier) transforms of various sizes. fftw-wisdom-to-conf libfftw3.so is the Fast Fourier Transform library. libfftw3.so libfftw3_threads.so is the threaded Fast Fourier Transform library. libfftw3_threads.so libfftw3f.so is the single-precision Fast Fourier Transform library, described as float for historic reasons. libfftw3f.so libfftw3f_threads.so is the threaded single-precision Fast Fourier Transform library. libfftw3f_threads.so libfftw3l.so is the long double Fast Fourier Transform library. libfftw3l.so libfftw3l_threads.so is the threaded long double Fast Fourier Transform library. libfftw3l_threads.so