7.6 Accessing the wisdom API from Fortran

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 section Wisdom Export) and importing (see section 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.