How to define line colour in zplane plotting

I have used the command; zplane to plot a graph and i wanted to change the line colour but still i am struggling...... if someone know how to do this please let me know!!!

Thank you, Ishan

Answer 1

[Babarandage Perera]

Thank you Walter Roberson and Matt Fig !!!

Walter I tried your code but it plots unit circle red and y axis green. since I wanted to plot zeros and poles in colours,I manage to modify the your code as;

figure(2) % Z-plane poles and zeors 
[hz1, hp1, ht1] = zplane(a,b); % Plot zeros and poles when coefficients are unquantized
 grid on;% turn on grids 
hold on;% Plot the second graph in same figure 
[hz2, hp2, ht2] = zplane(H_Ka,H_Kb);%Plot zeros and poles when coefficients unquantized
 hold off;

set(findobj(hz1, 'Type', 'line'), 'Color', 'g'); 
set(findobj(hp1, 'Type', 'line'), 'Color', 'g');
set(findobj(hz2, 'Type', 'line'), 'Color', 'r');
set(findobj(hp2, 'Type', 'line'), 'Color', 'r');

Thank you again Walter !! Cheers !!!

Answer 2

[Walter Roberson]

[hz,hp,ht] = zplane(...);
set(findobj(ht, 'Type', 'line'), 'Color', NewColor);

[Babarandage Perera]

first of all thank you again for your help

I am using z-plane command in following code. What i am trying to do is plot two results (poles and zeros)in one figure. But to distinguish thos two results( poles & zeros of quantized coefficients and poles and zeros of unquantized coefficients)i have to use two colours. Can you help????

figure(2) % Z-plane poles and zeors

zplane(a,b); % Plot zeros and poles when coefficients are unquantized

grid on;% turn on grids

hold on;% Plot the second graph in same figure

zplane(H_Ka,H_Kb);%Plot zeros and poles when coefficients unquantized

hold off;

[Walter Roberson]

figure(2) % Z-plane poles and zeors
[hz1, hp1, ht1] = zplane(a,b); % Plot zeros and poles when coefficients are unquantized
grid on;% turn on grids
hold on;% Plot the second graph in same figure
[hz2, hp2, ht2] = zplane(H_Ka,H_Kb);%Plot zeros and poles when coefficients unquantized
hold off;
set(findobj(ht1, 'Type', 'line'), 'Color', 'r'));
set(findobj(ht2, 'Type', 'line'), 'Color', 'g'));

Answer 3

[Matt Fig]

To change the color of the lines easily with a mouse click, you could use LINECMENU.

Answer 4

[Andrei Prikhod'ko]

Walter forever!!!

Answer 5

[Hansamal Dharmananda]

clc; clear;close all; 
%%
%%%%%%%%  a)  b)   %%%%%%%%%
B=[1 2 -1]; %numerator coeffients
A=[1 -1 0.5]; %denominator coeffients

Zeros=roots(B); %numerator
Poles=roots(A); %denominator

[hz1, hp1, ht1] = zplane(B,A);%with the unit circle
set(findobj(hz1, 'Type', 'line'), 'Color', 'b'); 
set(findobj(hp1, 'Type', 'line'), 'Color', 'g');
set(findobj(ht1, 'Type', 'line'), 'Color', 'r');
% H = tf(B,A); %set the transferfunction
% pzmap(H) % without the unit circle
title('Pole-zero map') 
axis([-3 1.2 -1.2 1.2]);