**
NMRPipe Processing Functions
RFT: Real Fourier Transform.
**

Notes: This is not the same as Complex Fourier Transform of real-only data; most cases require use of FT -real, not RFT. |

**RFT** applies a real Fourier transform (cosine transform)
to the current data vectors. Note that this is *not* the same as
applying a complex Fourier transform to real-only data, and so RFT
is seldom used. Instead, real-only data is usually transformed via
the FT -real nmrPipe processing function.
There is no requirement for
a power-of-two data size, but processing times will likely
be slower for non-power-of-two cases. FT options include
selection of forward or inverse transform.

**OPTIONS**

`-inv`

This flag selects an inverse Cosine transform.

**HEADER VALUES**

The **RFT** function toggles the NDFTFLAG to 0 or 1, depending
on whether the result is time-domain or frequency domain, respectively.