fdel

Delete specified data from frequency response data (FRD) models

Syntax

sysout = fdel(sys, freq)

Description

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

Input Arguments

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.

Examples

Remove selected data from a frd model. In this example, first obtain an frd model:

sys = frd(tf([1],[1 1]), logspace(0,1,10))
 
  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.

The following commands remove the data nearest 2, 3.5, and 6 rad/s from sys.

freq = [2, 3.5, 6];
sysout = fdel(sys, freq)
 
  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.

You do not have to specify the exact frequency of the data to remove. fdel removes the data nearest to the specified frequencies.

More About

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Tips

  • 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.

See Also

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