如何在 MATLAB 中自定义离散函数图？答案

【问题标题】：How to customize a discrete function plot in MATLAB?如何在 MATLAB 中自定义离散函数图？
【发布时间】：2010-10-23 10:32:58
【问题描述】：

我想像这样在 MATLAB 中绘制离散值：

stairs() 和 stem() 绘制了相似的图，但我可以将其中一个配置为类似于上图吗？

http://www.mathworks.com/help/techdoc/ref/plottype-stairs.gif http://www.mathworks.com/help/techdoc/ref/plottype-stem.gif

【问题讨论】：

标签： matlab graph discrete-mathematics

【解决方案1】：

你必须自己创建情节。

%# create some random data
data = randn(100,1);

%# sort ascending
data = sort(data(:)); %# make column vector, just in case

%# count
nData = length(data);

%# create data to plot (open, closed circles)
yData = linspace(0,1,nData-1)'; %'# SO formatting

closedX = data(1:end-1);
closedY = yData;

openX = data(2:end);
openY = yData;

%# lines are from open to close with NaN for where there should be no line
lineX = [closedX,openX,NaN(nData-1,1)]'; %'# SO formatting
lineX = lineX(:);
lineY = [closedY,openY,NaN(nData-1,1)]'; %'# SO formatting
lineY = lineY(:);

%# plot
figure %# I like to open a new figure before every plot
hold on
plot(lineX,lineY,'r')
plot(closedX,closedY,'ro','MarkerFaceColor','r')
plot(openX,openY,'ro','MarkerFaceColor','w')

【讨论】：

@sekmet64：是的，我刚刚注意到。我修复了这个问题，以及其他几个错误。现在它运行良好。