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Plot Nyquist Didatic

version 1.0.0 (5.73 KB) by fhz
A very simple function to understand Cauchy's argument principle and Nyquist Stability Criterion with 4 preprogrammed contours.


Updated 04 Jan 2020

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A didatic plot to understand and to present the Cauchy's argument principle (complex Mapping Theorem) and the Nyquist Stability Criterion.

The are four preprogrammed contours given by the variable "op".
'ret'; pts = [x0,y0, x1,y1]; % The vertices of a rectangle
'circle'; pts = [R, xc,yc]; % The radius and center of a circle
'ny_base'; pts = [R, xc,yc]; % The radius of a right semicircle and its center
'ny_desv'; pts = [R, xc,yc, epsilon]; % 'nybase' with a semicircle detour of radius epsilon.

Each preprogrammed contour is presented in four different colors and linestyles, enabling a fast understanding of the direction of the contour
and the relationship between the contour in the s-plane and transformed one in the F(s)-plane.

Cite As

fhz (2021). Plot Nyquist Didatic (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2017a
Compatible with any release
Platform Compatibility
Windows macOS Linux

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