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How to colour a portion of a curve by red and remaining by black

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I want to colour the lower portion of curve by red and broked curve and upper part of the curve by black as shown in the fig attached.
Code
clear all
format long
set(0,'DefaultAxesFontSize',20);
figure
load('EP_EP(1).mat','x'); %load only x
idx = x(3,:)>=0.16 & x(3,:)<=0.305003;
plot(x(3,:),x(1,:),'k--', 'LineWidth',2);
xlabel('$a$','FontSize',20,'interpreter','latex','FontWeight','normal','Color','k');
ylabel('$b$','FontSize',20,'interpreter','latex','FontWeight','normal','Color','k');
axis([0 .4 .3 1]);

Accepted Answer

Voss
Voss on 6 Jun 2024
Edited: Voss on 6 Jun 2024
set(0,'DefaultAxesFontSize',20);
figure
load('EP_EP(1).mat','x'); %load only x
[~,idx] = max(x(3,:));
plot(x(3,idx:end),x(1,idx:end),'k', 'LineWidth',2); % solid black line
hold on
plot(x(3,1:idx),x(1,1:idx),'r--', 'LineWidth',2); % broken red line
xlabel('$a$','FontSize',20,'interpreter','latex','FontWeight','normal','Color','k');
ylabel('$b$','FontSize',20,'interpreter','latex','FontWeight','normal','Color','k');
axis([0 .4 .3 1]);
  6 Comments
Atom
Atom on 7 Jun 2024
Thank you, Voss, for your support. I greatly appreciate your time and effort. My regards.

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More Answers (1)

John D'Errico
John D'Errico on 6 Jun 2024
Plot it as TWO curves, both on the same figure, one in red, one in black.
Use the hold command between the two calls to plot, so the two curves will be on the same figure.

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