How to find angle made by tangent at the end of a curve?

Hi,

I have attached the image of a curve obtained by using ode45 . Now my intention is to find the angle that the tangent at final points of the free end of the curve makes with the x-axis.

How do I do it?

Thank you

Answer 1

[KSSV]

Get the equation of tangent.....convert it to y = mx+c form......m should gives you slope which is the angle you want.

[Purush otham]

I already used this method in the following manner: W=za(:,1); Q=za(:,2); DZ=abs(Q(end)-Q(end-2)); DX=abs(W(end)-W(end-2)); M=DZ/DX; theta=rad2deg(atan(M))

I was hoping for another method as my intention is to stop the curve at my required theta.

[Purush otham]

Thanks anyway!

[Purush otham]

What to do if I am getting negative slope, though clearly the plot is not? I tried abs but it does not give the correct angle. The correct angle is only obtained when subtracted from 180 or added with 90.

[Torsten]

Instead of posting a figure, you should include the calculated coordinates of the last - say - 5 points of the curve.