如何在Matlab中绘制线段的名称？

Question

我想将名称添加到图中绘制的线段中。 例如，我绘制了包含两个端点（0，0）和（3，3）的线段，其名称为segment1。 如何在位置（0，1）上绘制其名称“ segment1”？

谢谢

Answer 1

我认为您正在寻找一种将文本添加到图形中的方法。

这个例子应该是一个很好的起点，它向您展示了如何使用text命令或legend ：

% Define initial conditions
t0 = 0;
tfinal = 15;
y0 = [20 20]';
% Simulate the differential equation
tfinal = tfinal*(1+eps);
[t,y] = ode23('lotka',[t0 tfinal],y0);
% Plot the two curves, storing handles to them
% so their DisplayNames can be set
hlines = plot(t,y);
% Compose and display two multiline text
% annotations as cell arrays
str1(1) = {'Many Predators;'};
str1(2) = {'Prey Population'};
str1(3) = {'Will Decline'};
text(7,220,str1)
str2(1) = {'Few Predators;'};
str2(2) = {'Prey Population'};
str2(3) = {'Will Increase'};
text(5.5,125,str2)
% Set DisplayNames for the lines for use by the legend
set(hlines(1),'Displayname','Prey')
set(hlines(2),'Displayname','Predator')
% Center a legend at the top of the graph
legend('Location','north')
% Add a title with bold style
title('Lotka-Volterra Predator-Prey Population Model',... 
  'FontWeight','bold')

请注意，该链接还描述了更多高级功能。

Answer 2

您想使用使用以下语法的文本注释：

  figure

plot([0 3], [0 3]);
hText = text(1 ,0.7,'Segment 1','FontSize',16) % Using (1,1) as a position was not looking good :)