FOURIER SERIES 程序包 符号

# NDTFourierTransform

gives a numerical approximation to the discrete time Fourier transform of expr evaluated at the numerical value , where expr is a function of n.

## 更多信息更多信息

• To use , you first need to load the Fourier Series Package using Needs["FourierSeries`"].
• The numerical approximation to the discrete time Fourier transform of expr is by default defined to be NSum[expr -n, {n, -∞, ∞}].
• Different choices for the definition of the discrete time Fourier transform can be specified using the option FourierParameters.
• With the setting FourierParameters->{a, b}, the discrete time Fourier transform computed by is NSum[expr -bn, {n, -∞, ∞}].
• The parameter b in the setting FourierParameters->{a, b} must be numeric.
• In addition to the option FourierParameters, can also accept the options available to NSum. These options are passed directly to NSum.

## 范例范例打开所有单元关闭所有单元

### 基本范例 (1)基本范例 (1)

Different definitions for numerical approximation of a discrete time Fourier transform:

 Out[2]=
 Out[3]=

Compare with the answer from symbolic evaluation with FourierSequenceTransform:

 Out[4]=
 Out[5]=
 Out[6]=

## 教程教程

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