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As explained in Words of Wisdom-Saving Plans, FFTW provides a “wisdom” API for saving plans to disk so that they can be recreated quickly. The C API for exporting (see Wisdom Export) and importing (see Wisdom Import) wisdom is somewhat tricky to use from Fortran, however, because of differences in file I/O and string types between C and Fortran.
| • Wisdom File Export/Import from Fortran: | ||
| • Wisdom String Export/Import from Fortran: | ||
| • Wisdom Generic Export/Import from Fortran: |