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(fftw.info)Multi-dimensional Array Format

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Multi-dimensional Array Format
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   This section describes the format in which multi-dimensional arrays
are stored.  We felt that a detailed discussion of this topic was
necessary, since it is often a source of confusion among users and
several different formats are common.  Although the comments below
refer to `fftwnd', they are also applicable to the `rfftwnd' routines.

Row-major Format

Column-major Format

Static Arrays in C

Dynamic Arrays in C

Dynamic Arrays in C-The Wrong Way