fft

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Open table with initial data and use `Analysis → Fast Fourier Transform`

menu item to perform FFT.

MagicPlot uses 'electrical engineering' convention to set the sign of the exponential phase factor of FFT. ^{1)}

Here is signal components and spectrum components, .

Normalize Check Box | Forward Transform (Signal→Spectrum) | Inverse Transform (Spectrum→Signal) |
---|---|---|

Unchecked | ||

Checked |

Sampling Interval | Sampling interval is used to compute the data in resulting sampling column which will be (if `Center zero frequency` is unchecked): |
---|---|

Real Imaginary | Columns with real and imaginary components of data. If your data is only real, select `<all zeros>` imaginary item |

Forward Inverse | Transform direction |

Normalize forward transform | Divide forward transform result by number of points N |

Center zero frequency | If selected, after forward Fourier transform the two parts of spectrum will be rearranged so that the lower frequency components are in the center; the opposite rearrangement of spectrum will be done before inverse transform if any. |

Most scientific applications uses the same sign conventions. But note, that the sign of exponential phase factor in Numerical Receipts in C, 2nd edition, p. 503 is the opposite

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fft.1272230713.txt.gz · Last modified: Sun Nov 8 12:20:32 2015 (external edit)

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