如何在MATLAB中更改条形颜色 [英] How to change bars colour in MATLAB

问题描述

我是编程新手，所以我正在学习MATLAB入门知识，我想知道如何在MATLAB中更改条形的颜色.

I am new to programming so I am learning introductory to MATLAB I was wondering how you could change colours of bar in MATLAB.

这是我的脚本.有人可以帮忙吗！

this is my script. Can someone please help!!

x =[1:8]
for y = [20 30 40 50 60 70 80]
bar(x,y)
if y < 40
col = 'b';
else if y > 40
col= 'g';
end
end
end

我也尝试过bar(x，y，r)，但是它不起作用

i also tried bar(x,y, r) but it doesnt work

推荐答案

虽然这对于您的特定问题来说是过大的，但是通常来说，要根据条的高度更改条的颜色，您可以在条上应用colormap .这主要来自 bar文档.

Whilst this is overkill for your specific question, in general, to change the colour of bars depending on their height, you can apply a colormap to the bars. This is mainly from the bar documentation.

x = 1:8;
y = 10*x;
h=bar(y);  %// create a sample bar graph

对于颜色图MAP，请执行以下操作:

For the colormap MAP, you do this:

colormap(MAP)
ch = get(h,'Children');
fvd = get(ch,'Faces');
fvcd = get(ch,'FaceVertexCData');
[zs, izs] = sort(y);
for i = 1:length(x)
    row = izs(i);
    fvcd(fvd(row,:)) = i;
end
set(ch,'FaceVertexCData',fvcd)
hold off

例如，使用内置的colormap hsv

And, for example, using the builtin colormap hsv, you get

但是在这种情况下，我们需要一个非常具体的色彩图，

But in this case we want a very specific colormap,

b=40 %// the cut-off for changing the colour
MAP=zeros(length(x),3); %// intialise colormap matrix
MAP(y<b,:)=repmat([0 0 1],sum(y<b),1); %// [0 0 1] is blue, when y<40
MAP(y>=b,:)=repmat([0 1 0],sum(y>=b),1); %// [0 1 0] is green, for y>=40
colormap(MAP)

给出

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