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

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Atom
Atom 2024-6-6
评论： Voss 2024-6-7
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]);

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采纳的回答

Voss
Voss 2024-6-6
编辑：Voss 2024-6-6
Ran in:
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]);
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Atom
Atom 2024-6-7
Thank you, Voss, for your support. I greatly appreciate your time and effort. My regards.

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更多回答（1 个）

John D'Errico
John D'Errico 2024-6-6
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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