Add background color for some values in a plot of two two variables

2 次查看（过去 30 天）

Muhammad Usman 2022-9-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1805270-add-background-color-for-some-values-in-a-plot-of-two-two-variables

评论： Ben 2022-9-23

Hi everyone. I have two variables av1 and av2. Each variables have 114 data points. I want to draw it in same figure but at same time and point I also want to calculate p value from ttest between av1 and av2. So if the significance difference is less then 0.05 at that data point it should draw a background colour. I attached the figure.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Ben 2022-9-23

Remember to mark the question as answered or post follow-up comments.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Ben 2022-9-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1805270-add-background-color-for-some-values-in-a-plot-of-two-two-variables#answer_1053420

编辑：Ben 2022-9-16

在 MATLAB Online 中打开

You can plot a bar graph and then set the FaceAlpha to less than 1.

x = [0 1 2 2 3 4 4 6 7 7];

y = [1 2 2 3 4.5 4.5 6 7];

p = [2.15e-12 2.72e-11 2.397e-10 0.0600 5.613e-09 1.803e-08 4.831e-08...

8.945e-08 1.874e-07 2.894e-07];

plot(x,'b')

hold on;

plot(y, 'k')

ax = gca; %Get axis size info

ylimVals = ax.YLim; %Y limits

scaleFact = max(ylimVals);

b1 = bar(scaleFact*(p < 0.05),'b'); %plot blue bar graph

b1.FaceAlpha = 0.5; %Set transparency to 50%

b1.EdgeAlpha = 0; %Maybe you want no outline on the bar

ylim(ylimVals); %Set ylim correctly

uistack(b1, 'bottom') %Move background below other elements

5 个评论
显示 3更早的评论隐藏 3更早的评论

Ben 2022-9-16

I've edited my answer and tested the code locally with your data and think it does what you want.

I think the key understanding here is that you don't need to loop through p. MATLAB allows vector calculations, so you can check every cell in p at once.

out = p < 0.05;

Out will be a logical index (that is, 1 where p < 0.05, 0 otherwise) with the same length as p. You can then plot the logical index with a scaling factor to get the background at a consistent height.

Ben 2022-9-19