How to find the area if the traced are in the graph graph?

Good day, I am trying to calculate the area of the traced area shown in the graph. This is my Matlab code.

y = [40 40 30 20 15 15 22 33 46 56 48 26 20 20];
x = [1 2 3 4 5 6 7 8 9 10 11 12 13 14];
plot(x,y,'*')
ylim([0 60])

annotation('line',[0.7383 0.7969],[0.7576 0.4664])
annotation('line',[0.6759 0.7355],[0.873 0.7621])
annotation('line',[0.6294 0.6841],[0.7335 0.871])
annotation('line',[0.5742 0.6305],[0.5607 0.7379])
annotation('line',[0.5205 0.5747],[0.4112 0.5672])
annotation('line',[0.4078 0.5184],[0.3184 0.4126])
annotation('line',[0.8529 0.9074],[0.3829 0.3829])
annotation('line',[0.7953 0.8516],[0.4641 0.382])
annotation('line',[0.4028 0.9047],[0.3178 0.3769])

And is there a way to color the traced area like this one

Thank you so much.

Answer 1

[darova]

• select points you need
• use trapz or polyarea

y = [40 40 30 20 15 15 22 33 46 56 48 26 20 20];
x = [1 2 3 4 5 6 7 8 9 10 11 12 13 14];
ii = [5 7:length(x) 5];
plot(x,y,'*')
line(x(ii),y(ii))
trapz(x(ii),y(ii))
polyarea(x(ii),y(ii))

[John Reige Bendijo]

Thank you so much.