Find out the intersection of two curves despite NaN-Values

Hello there,

im struggeling with a the intersection of two curves. One curve is defined as a function :

x= (0 : 50)

y=(m*x)+yaxis (m and yaxis are constants).

The other curves is defined as a dataset of two vectors. Lets say:

V1=[1 2 3 4 5] and V2=[50 80 NaN 90 100].

Right now im using polyxpoly, but it struggels with the NaN-Value:

[xi,yi] = polyxpoly(V1,V2,x,y)

xi and yi would be the intersection.

Does anyone have a better alternative ?

Thank you for your help, Ben !

Answer 1

[Jan]

x = 0:50;
m = 0.234;
yaxis = 60;
y  = (m*x)+yaxis;

V1 = [1 2 3 4 5];
V2 = [50 80 NaN 90 100];

V1(isnan(V2)) = nan;  % Avoid error message from polyxpoly

[xi,yi] = polyxpoly(V1,V2,x,y)

xi = 1.3438

yi = 60.3145

plot(x, y);
hold('on');
plot(V1, V2);
plot(xi, yi, 'ok')

I'm not sure what "it struggels with the NaN-Value" means. Without setting the x-value to NaN at locations, where the y-value is NaN, polyxpoly throghs an error. But with a cleaning the code runs fine. So what exactly is the problem?

[Benedikt Friedrich Nowak]

Thank you !