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.
fhz (2021). Plot Nyquist Didatic (https://www.mathworks.com/matlabcentral/fileexchange/73829-plot-nyquist-didatic), MATLAB Central File Exchange. Retrieved .
MATLAB Release Compatibility
Platform CompatibilityWindows macOS Linux
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