how to fill between 2 graphs
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Hi eveybody
I could not fill the gap betwween 2 curves. it is shown in below figure.
can anyone help me?
thanks
The code I used is:
plot(KI1,KP1);
xlabel('K_I');
ylabel('K_P');
grid on
hold on
x2=zeros(1,150)
y=linspace(-20,40,numel(x2))
plot(x2,y,'linewidth',2)
6 个评论
darova
2020-4-10
Did you try area? What about intersection fo curves?
halil hasan
2020-4-12
darova
2020-4-12
Maybe i can correct your code? Allow me to help you
halil hasan
2020-4-12
darova
2020-4-12
I have an error here
Do you know why?
halil hasan
2020-4-13
采纳的回答
Les Beckham
2020-4-11
What do you mean by "fill the gap"? Do you want to connect the start and end points so that this becomes a closed curve? If so, this should do it:
plot([KI1(:); KI1(1)], [KP1(:); KP1(1)]);
xlabel('K_I');
ylabel('K_P');
grid on
7 个评论
halil hasan
2020-4-12
Les Beckham
2020-4-12
编辑：Les Beckham
2020-4-12
In that case, try something like this (I've made up some data that is somewhat similar to your plot, though not as smooth).
KI1 = [0 -190 -100 0 90 80];
KP1 = [40 5 -18 -16 -5 -2];
fill([KI1(:); KI1(1)], [KP1(:); KP1(1)], 'b', 'EdgeColor', 'None') % Fill the shape with blue
hold on
plot([KI1(:); KI1(1)], [KP1(:); KP1(1)], 'k', 'LineWidth', 2) % Outline the edges in black
xlabel('KI1')
ylabel('KP1')
If this doesn't get you to what you want, it would help if you share the data for KI1 and KP1.
halil hasan
2020-4-13
halil hasan
2020-4-13
Les Beckham
2020-4-13
Maybe this will do what you want:
KI1 = [0 -190 -100 0 90 80];
KP1 = [40 5 -18 -16 -5 -2];
idx = find(KI1 <= 0); % find indices of non-positive KI1 values
fill([KI1(idx) KI1(find(idx,1))], [KP1(idx) KP1(find(idx,1))], 'b', 'EdgeColor', 'None')
hold on
plot([KI1(:); KI1(1)], [KP1(:); KP1(1)], 'k', 'LineWidth', 2)
xlabel('KI1')
ylabel('KP1')
halil hasan
2020-4-14
Les Beckham
2020-4-14
You are welcome. Glad I could help.
更多回答（1 个）
darova
2020-4-13
Here is my shot
y = 0:0.1:pi;
x1 = -sin(y);
x2 = y*0-0.3;
[xc,yc] = polyxpoly(x1,y,x2,y);
xx = [xc(1) x1(x1<x2) xc(end)];
yy = [yc(1) y(x1<x2) yc(end)];
plot(x1,y,x2,y)
patch(xx,yy,'r')
line(xc,yc,'marker','o')
success?
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