How to plot points with corresponding colour

2024 4 23
1 个回答
回答已采纳
更新时间：2024 4 26
4 次查看（30 天）

0 个投票

Given I have an excel data where a1 is the first row of data, a2 is the second row of data and b is the corresponding label. B has either blue or red. When I plot it plots it all as a scatter plot but in blue. I want to make the points red when b says red for that label. How do i do this??

请先登录，再回答此问题。

 采纳的回答

Dyuman Joshi
Dyuman Joshi 2024-4-23

1 个投票

(Assuming there are only red and blue colors for the plot) Use logical indexing -
%Check which elements of B are red
idx = strcmp(B, 'red');
f = figure;
hold on
%plot data with red color
scatter(a1(idx), a2(idx), [], 'r')
%plot data with blue color
scatter(a2(~idx), a2(~idx), [], 'b')
hold off

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Hannah
Hannah 2024-4-26
I tried that and it is not really working properly. I do not know if its my file that is the problem.
After uploading my excel dataset, this is how my codes look like
Dataset.Y(strcmp(Dataset.Y, 'red')) = {'-1'}
Dataset.Y(strcmp(Dataset.Y, 'blue')) = {'1'}
Dataset.Y = str2double(Dataset.Y)
data = table2array(Dataset)
%I think I am going wrong when plotting it or when turning the data into a
%matrix asthe number of rows do not match the height of the table

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Scatter Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by