绘制分段函数 [英] Plotting piecewise function

问题描述

我有一个差分解决方案，但问题是我在不同的时间间隔有不同的解决方案.

I have a solution to a differential solution but the issue is that I have different solutions in different intervals.

例如:

x_1(t) when t belongs to [0,t_1]  
x_2(t) when t belongs to [t_1,t_2]  
x_3(t) when t belongs to [t_2,t_3]

现在我需要绘制这些图，以便它们看起来像是具有一个函数，即紧接在第一个图x_1(t)之后直到t_1，我需要另一个图x_2(t)，依此类推.

Now I need to plot these graphs so that they look like they have a single function i.e just immediately after the first graph x_1(t) until t_1, I need the other graph x_2(t) and so on.

在Matlab中可以吗?

Is it possible in Matlab?

推荐答案

您可以使用 plot ，具有多个输入以将它们完全绘制在一起:

You can use plot with multiple inputs to plot them altogether:

% the functions:
x_1 = @(t) 2.*t;
x_2 = @(t) 5.*t;
x_3 = @(t) 7.*t;
% the transition points:
t_1 = 30;
t_2 = 60;
t_3 = 90;
% plotting:
plot(0:t_1,x_1(0:t_1),t_1:t_2,x_2(t_1:t_2),t_2:t_3,x_3(t_2:t_3))

让您定义各种特定于功能的视觉属性的另一种方法是使用 hold :

Another way, that lets you define all kind of function specific visual properties is to use hold:

f = @(t,a) a.*t;
t = 0:30:100;
m = 'os^'; % choosing different marker for each function
for k = 1:numel(t)-1
    plot(t(k):t(k+1),f(t(k):t(k+1),k),m(k))
    hold on
end
hold off

这篇关于绘制分段函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！