How to fill the stair plots with some color.

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shane watson 2019-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/482236-how-to-fill-the-stair-plots-with-some-color

评论： shane watson 2019-12-5

Hello,

Below are plots (subplot) and having Figure 1 I wanted to fill these stairs (inside) same as figure 2 . I really appreciate your help in this regard.

Figure: 1

Figure 2

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Renato SL 2019-9-26

编辑：Renato SL 2019-9-26

I wouldn't call it as to fill the stair plots with some color.

I think the Figure 1 was made using the plot function, while Figure 2 was made using the stem function. The "color" you see is the stems of the plotted values.

Documentation of the stem function here.

Adam Danz 2019-9-26

编辑：Adam Danz 2019-9-26

The image in "figure 2" is not really a fill. As Renato SL pointed out, it's a bunch of stem plot lines which requires a lot of data points to appear as "filled". A patch is a better approach.

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采纳的回答

Adam Danz 2019-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/482236-how-to-fill-the-stair-plots-with-some-color#answer_393583

编辑：Adam Danz 2019-9-26

在 MATLAB Online 中打开

This solution reproduces the (x,y) coordinates for the staircase and then uses fill() to fill in the area under the stairs.

% Create demo plot
X = linspace(0,4*pi,40);
Y = sin(X);
figure
sh = stairs(Y); 
hold on
% Get the (y,x) coordinates from the original inputs or from  
% the xdata and ydata properties of the stair object which will
% always be row vectors.  
bottom = -1.5; %identify bottom; or use min(sh.YData)
x = [sh.XData(1),repelem(sh.XData(2:end),2)];
y = [repelem(sh.YData(1:end-1),2),sh.YData(end)];
% plot(x,y,'y:') %should match stair plot
% Fill area
fill([x,fliplr(x)],[y,bottom*ones(size(y))], 'g')

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Adam Danz 2019-12-5

编辑：Adam Danz 2019-12-5

在 MATLAB Online 中打开

I just tested my suggestion with your code and it works perfectly.

x = time
y = EP
% See rest of my suggestion

If it still doesn't work you'll need to explain what's not working and I suggest doing that in a new question rather than extending this thread since the topic slightly differs (you could provide the link to the new question here).

shane watson 2019-12-5

Thanks once again, it worked. However, I also posted related question on the following link, kindly check it https://se.mathworks.com/matlabcentral/answers/494956-adding-transparency-when-filling-color-in-plots

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