Shading area under the curve

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;

[Walter Roberson]

Can you attach your data for testing?

[Youngmin]

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

Answer 1

[Mehmed Saad]

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')

[Youngmin]

Thank you for your reply. But I am looking for a way to fill the color at the selected area exceeding a certain y-value (i.e., BW).

[Mehmed Saad]

o sorry i didn't read that. see the updated answer

[Youngmin]

Thank you so much!

[Youngmin]

Is there any way to remove the solid line of the yline? I think the line created by the area function.

[Mehmed Saad]

set the ShowBaseLine property of area to off

area(x,vgrf2,bw,'EdgeColor','none','FaceColor','g','ShowBaseLine','off')

[Youngmin]

Thank you. it works very well!