Nyquist plot, with only positive frequencies and 6dB circle around -1 point

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Files

[[File: nyquist2.zip]

Description

Plot Frequency Response Function with

• Correct label sizes
• Optimized for MIMO systems
• Enable use of custom colors (lightgrey, darkgrey, pink, etc.)
• Adjustable linewidth and marker size
• Easy to adjust limits
• Plot only magnitude or phase using the frfmag() and frfphase() functions

  Usage:   frf(sys1,'color/linetype/linewidth/marker/markersize',sys2,'color/linetype/linewidth/marker/markersize',...
           ...{fmin,fmax,magmin,magmax,phasemin,phasemax,wraponoff,type})

  Inputs:  You can use custom colors, e.g. lightgrey, pink, etc. (see line ~315)
           To use the . marker give \. as marker (to distinguist from dots in linewidth specs) 
           example strings: 'lightgrey--1.5o12'    lightgrey dashed line with circle marker of size 12 
                            'orange\.'             orange solid line, dot marker 
                            'b*10'                 blue markers size 10, no line
           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.

Author

Rob Hoogendijk