Shading area under the curve

Question

Youngmin 2020-5-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525850-shading-area-under-the-curve

评论： Youngmin 2020-5-16

采纳的回答： Mehmed Saad

sample.mat

在 MATLAB Online 中打开

Hello,

I am struggling with shading area under the curve at the selected area. I wanted to fill the area over Body Weight line. I have attached my code and the screenshot of the plot.

x = 0:2500;
Lvy = (611 <= x)&(vgrf2 >= bw) & (x < 794);
figure(1)
plot(x,vgrf2,'k')
hold on;
xline(lcom,'k--','Lowest COM position','LabelHorizontalAlignment','center',...
    'LabelOrientation','horizontal');
yline(bw,'k--',{'Body','Weight'},'LabelHorizontalAlignment','left',...
    'LabelVerticalAlignment','middle');
patch([x(Lvy) fliplr(x(Lvy))], [ones(size(x(Lvy))) fliplr(vgrf2(Lvy))], 'g')
hold off;

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Walter Roberson 2020-5-16

Can you attach your data for testing?

Youngmin 2020-5-16

I have attached the sample.mat file on the original post. Also, BW is 762.6170, and lcom is 611.

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Answer 1

Mehmed Saad 2020-5-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525850-shading-area-under-the-curve#answer_432756

编辑：Mehmed Saad 2020-5-16

在 MATLAB Online 中打开

Use area for that purpose by selecting the specific range and use area

x = 0:2500;bw =700;lcom = 611;
Lvy = (611 <= x)&(vgrf2 >= bw) & (x < 794);
figure(1)
plot(x,vgrf2,'k')
hold on;
xline(lcom,'k--','Lowest COM position','LabelHorizontalAlignment','center',...
    'LabelOrientation','horizontal');
yline(bw,'k--',{'Body','Weight'},'LabelHorizontalAlignment','left',...
    'LabelVerticalAlignment','middle');
selected_area = lcom:793;
area(selected_area,vgrf2(selected_area),bw,'EdgeColor','none','FaceColor','g')

Also to select all the area ahead of this point which is greater than bw in y and lcom in x

load('sample.mat')
x = 0:2500;bw =700;lcom = 611;
figure(1)
plot(x,vgrf2,'k')
hold on;
xline(lcom,'k--','Lowest COM position','LabelHorizontalAlignment','center',...
    'LabelOrientation','horizontal');
yline(bw,'k--',{'Body','Weight'},'LabelHorizontalAlignment','left',...
    'LabelVerticalAlignment','middle');
ind = (vgrf2>bw)&x>lcom;
vgrf2(~ind) = NaN;
area(x,vgrf2,bw,'EdgeColor','none','FaceColor','g')