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4.3 Basic Interface

Recall that the FFTW API is divided into three parts⁶: the basic interface computes a single transform of contiguous data, the advanced interface computes transforms of multiple or strided arrays, and the guru interface supports the most general data layouts, multiplicities, and strides. This section describes the basic interface, which we expect to satisfy the needs of most users.

• Complex DFTs
• Planner Flags
• Real-data DFTs
• Real-data DFT Array Format
• Real-to-Real Transforms
• Real-to-Real Transform Kinds