how can we find the intersect points of these two plots?

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MOHD UWAIS
MOHD UWAIS 2023-2-16
回答： Askic V 2023-2-16
Ran in:
for y=-3:1:5;
G=[];
B=[];
for a=1:1:50
z=10;
x=a+y;
G=[G x];
b=z+30;
B=[B b];
end
B;
G;
a=1:1:50;
plot(a,G,'-')
hold on
plot(a,B,'-')
end
  1 个评论
Rik
Rik 2023-2-16
You have put the names of several people in the tags (which doesn't actually do anything), you didn't format or run your code (I just did that for you), and instead of 2 lines you have 10 lines.
So what actually is your question?

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采纳的回答

Oguz Kaan Hancioglu
Ran in:
Since B is constant it is easy to find the intersect point of lines using find command. Editted code listed below.
for y=-3:1:5;
G=[];
B=[];
for a=1:1:50
z=10;
x=a+y;
G=[G x];
b=z+30;
B=[B b];
end
B;
G;
a=1:1:50;
plot(a,G,'-')
hold on
plot(a,B,'-')
% find index
x = find(G == B(1));
% print intersect points
fprintf('intersect points = %.2f at %d, index number = %d\n',G(x),a(x),x);
% print intersect points on the plot
plot(a(x),G(x),'ro');
end
intersect points = 40.00 at 43, index number = 43 intersect points = 40.00 at 42, index number = 42 intersect points = 40.00 at 41, index number = 41 intersect points = 40.00 at 40, index number = 40 intersect points = 40.00 at 39, index number = 39 intersect points = 40.00 at 38, index number = 38 intersect points = 40.00 at 37, index number = 37 intersect points = 40.00 at 36, index number = 36 intersect points = 40.00 at 35, index number = 35
Best,

更多回答（2 个）

Sulaymon Eshkabilov
Ran in:
Here is how to compute the intersect points of the plotted set of data points:
clearvars
close all
y=-3:1:5;
a=1:50;
for ii=1:numel(y)
G=[];
B=[];
for jj=1:numel(a)
z=10;
x=a(jj)+y(ii);
G=[G x];
b=z+30;
B=[B b];
end
plot(a,G,'-')
hold on
plot(a,B,'--')
Intersect = find(abs(B-G)==0);
ai = a(Intersect);
Gi = G(Intersect);
plot(ai, Gi, 'ro', 'MarkerFaceColor','y')
end
Askic V
Askic V 2023-2-16
Ran in:
I think this small code snippet can be useful to you in future if you have a bit more general case:
x = 0:0.1:5;
y_val = 4*x-2;
intersect_points = [];
m = 2;
n = [1 2 3 4 5];
for i = n
y = m*x+i;
plot(x, y);
hold on
xisx = interp1(y-y_val, x, 0);
yisx = m*xisx+i;
plot(xisx, yisx,'o')
intersect_points = [intersect_points; xisx, yisx];
end
plot(x, y_val);
grid on
intersect_points
intersect_points = 5×2
1.5000 4.0000 2.0000 6.0000 2.5000 8.0000 3.0000 10.0000 3.5000 12.0000

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