MATLAB 填充线之间的区域 [英] MATLAB fill area between lines

问题描述

我正在尝试做一些类似于这篇文章中概述的事情:MATLAB，填写两组数据之间的区域，一个图中的线但遇到了障碍.我正在尝试对表示平均值 +/- 标准偏差的图形区域进行着色.变量定义有点复杂，但归结为这段代码，当绘制没有阴影时，我得到以下屏幕截图:

I'm trying to do something similar to what's outlined in this post: MATLAB, Filling in the area between two sets of data, lines in one figure but running into a roadblock. I'm trying to shade the area of a graph that represents the mean +/- standard deviation. The variable definitions are a bit complicated but it boils down to this code, and when plotted without shading, I get the screenshot below:

x = linspace(0, 100, 101)';    
mean = torqueRnormMean(:,1);
meanPlusSTD = torqueRnormMean(:,1) + torqueRnormStd(:,1);
meanMinusSTD = torqueRnormMean(:,1) - torqueRnormStd(:,1);
plot(x, mean, 'k', 'LineWidth', 2)
plot(x, meanPlusSTD, 'k--')
plot(x, meanMinusSTD, 'k--')

但是当我尝试通过添加下面的代码在图的下半部分(在均值和均值负标准之间)实现着色时，我得到一个如下所示的图:

But when I try to implement shading just on the lower half of the graph (between mean and meanMinusSTD) by adding the code below, I get a plot that looks like this:

fill( [x fliplr(x)],  [mean fliplr(meanMinusSTD)], 'y', 'LineStyle','--');

这显然没有对图形的正确区域进行着色，并且正在创建接近 0 的新近水平线，这些线会干扰着色.

It's obviously not shading the correct area of the graph, and new near-horizontal lines are being created close to 0 that are messing with the shading.

有什么想法吗?我被难住了.

Any thoughts? I'm stumped.

推荐答案

原来是列向量与行向量的问题.出于某种原因，使用带有原始列向量的 flipud 的上述填充方法不起作用，但转置原始变量然后使用fliplr 可以.去搞清楚.这是代码，以防它帮助其他人:

It turned out to be a column vs row vector issue. For some reason using the fill method above with flipud with the original column vectors doesn't work, but transposing the original variables then using fliplr does. Go figure. Here's the code in case it helps someone else:

x = linspace(0,100, 101);
mean = torqueRnormMean(:,DOF)';
meanPlusSTD = torqueRnormMean(:,DOF)' + torqueRnormStd(:,DOF)';
meanMinusSTD = torqueRnormMean(:,DOF)' - torqueRnormStd(:,DOF)';
fill( [x fliplr(x)],  [meanPlusSTD fliplr(meanMinusSTD)], 'k');
alpha(.25);
plot(x, mean, 'k', 'LineWidth', 2)
plot(x, meanPlusSTD, 'k')
plot(x, meanMinusSTD, 'k')

请注意，我删除了虚线，仅使用细线与粗线来表示标准偏差和平均值.我这样做是因为线条样式不一致.这段代码在一个循环中，其中 DOF 从 1:9 开始运行，并且在一些子图中，两条标准曲线都将是虚线，而在一些只是顶部或底部.让它们破灭对我来说并不重要，所以我保持简单.现在这是我得到的图表的一个例子:

Note that I removed the dotted line and just used thin vs. thick lines to denote standard deviation and mean. I did this because the line style was inconsistent. This code is in a loop where DOF runs from 1:9, and in some of the subplots both std curves would be dashed and in some just the top or bottom. It didn't matter enough to me to have them dashed so I kept it simple. Now this is an example of the graph I get:

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