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# API
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This library provides a set of functions for computation derivatives using spectral methods. The lib depends on [FFTW](http://www.fftw.org/) library. The library is compatible with W-SLDA Toolkit however, it can be used as standalone lib. It is written in [C99 standard](https://en.wikipedia.org/wiki/C99).
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# Name convention
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Generic name of a function is `wderiv_operation_Nd_t`, where:
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* `wderiv`: fixed, function belongs to *wderiv* lib,
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* `operation`:
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* dfdx
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* dfdy
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* dfdz
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* d2fdx2
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* d2fdy2
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* d2fdz2
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* dnfdxn
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* dnfdyn
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* dnfdzn
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* gradient
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* divergence
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* ...
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* `x`:
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* `1` for 1D problems
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* `2` for 2D problems
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* `3` for 3D problems
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* `t`:
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* `r` for real problems
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* `c` for complex problems
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# Examples |
