Frequency Response Function Plotting

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Files

Note: Wikipedia automatically changes the first letter of a filename to uppercase. To avoid warnings in Matlab, save the file in lowercase.

File:Frf.m, File:Frfmag.m, File:Frfphase.m

Description

Plot Frequency Response Function with

• Correct label sizes
• Optimized for MIMO systems
• Enable use of custom colors (lightgrey, darkgrey, pink, etc.)
• Easy to adjust limits

   Usage:   frf(sys1,'color/linetype/marker',sys2,'color/linetype/marker',...
            ...{fmin,fmax,magmin,magmax,phasemin,phasemax,wraponoff,type})
            
            frfmag(sys,...) and frfphase(sys,...) use the same syntax but only plot
            the magnitude or phase plot respectively
            
   Inputs:  You can use custom colors, e.g. lightgrey, pink, etc. (see line 180)
            example strings: 'b', 'lightgrey--*', 'orange', '-^'
 
            All elements in the options-struct are optional 
            fmin/fmax in Hz
            magmin/magmax in dB
            phasemin/phasemax in degrees
            wraponoff: [ 'on' | 'off' (default) ]
            type: [ 'mag' | 'phase' | 'magphase' (default) ]

   Outputs: Plots the frf in the current figure.
            Note that the xticklabels might overlap the xlabel in the
            figure. In an exported pdf file they will be correct.

Example

frf.m vs bode.m

Author

Rob Hoogendijk