Nyquist plot, with only positive frequencies and 6dB circle around -1 point: Difference between revisions

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;Files:
;Files:
Note: Wikipedia automatically changes the first letter of a filename to uppercase. To avoid warnings in Matlab, save the file in lowercase.
[[File: nyquist2.zip]


[[File: nyquist2.m]


;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',...
;Description:
            ...{fmin,fmax,magmin,magmax,phasemin,phasemax,wraponoff,type})
Draw a Nyquist plot with
* Only positive frequencies
* Frequency units in Hz
* 6dB circle around the -1 point


  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.
;Usage:  
            Note that the xticklabels might overlap the xlabel in the
Same as conventional nyquist, type "help nyquist" for info
            figure. In an exported pdf file they will be correct.
 
 


;Author: Rob Hoogendijk
;Author: Rob Hoogendijk

Revision as of 16:47, 15 October 2013

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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: nyquist2.m]


Description

Draw a Nyquist plot with

  • Only positive frequencies
  • Frequency units in Hz
  • 6dB circle around the -1 point


Usage

Same as conventional nyquist, type "help nyquist" for info


Author
Rob Hoogendijk
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