fdel

Delete specified data from frequency response data (FRD) models

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语法

sysout = fdel(sys, freq)

说明

sysout = fdel(sys, freq) removes from the frd model sys the data nearest to the frequency values specified in the vector freq.

输入参数

sys

frd model.

freq

Vector of frequency values.

Output Arguments

sysout

frd model containing the data remaining in sys after removing the frequency points closest to the entries of freq.

示例

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此示例使用:

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Create a frequency response data (FRD) model at specified frequencies from a transfer function model.

w = logspace(0,1,10);
sys = frd(tf([1],[1 1]),w)
sys =
 
    Frequency(rad/s)        Response    
    ----------------        --------    
          1.0000        0.5000 - 0.5000i
          1.2915        0.3748 - 0.4841i
          1.6681        0.2644 - 0.4410i
          2.1544        0.1773 - 0.3819i
          2.7826        0.1144 - 0.3183i
          3.5938        0.0719 - 0.2583i
          4.6416        0.0444 - 0.2059i
          5.9948        0.0271 - 0.1623i
          7.7426        0.0164 - 0.1270i
         10.0000        0.0099 - 0.0990i
 
Continuous-time frequency response.
Model Properties

w is a logarithmically-spaced grid of 10 frequency points between 1 and 10 rad/second.

Remove the data nearest 2, 3.5, and 6 rad/s from sys.

freq = [2, 3.5, 6];
sys2 = fdel(sys,freq)
sys2 =
 
    Frequency(rad/s)        Response    
    ----------------        --------    
          1.0000        0.5000 - 0.5000i
          1.2915        0.3748 - 0.4841i
          1.6681        0.2644 - 0.4410i
          2.7826        0.1144 - 0.3183i
          4.6416        0.0444 - 0.2059i
          7.7426        0.0164 - 0.1270i
         10.0000        0.0099 - 0.0990i
 
Continuous-time frequency response.
Model Properties

Note that you do not have to specify the exact frequency of the data to remove. The fdel command removes the data corresponding to frequencies that are nearest to the specified frequencies.

提示

  • Use fdel to remove unwanted data (for example, outlier points) at specified frequencies.

  • Use fdel to remove data at intersecting frequencies from frd models before merging them with fcat. fcat produces an error when you attempt to merge frd models that have intersecting frequency data.

  • To remove data from an frd model within a range of frequencies, use fselect.

版本历史记录

在 R2012a 中推出

另请参阅

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