getting all points over a specific part in matlab plot

to plot the attached data, this is my command

plot3(radius(:,1),radius(:,2),radius(:,3),'.')

above plot is the view in YZ plane for the attached data.

I want to store all points which are lying above the red line in above plot?

Answer 1

[KSSV]

Read about scatteredInterpolant .....this will help you to get what you want.

Let (xi,yi) be the x,y, coordinates of the red line.

F = scatteredInterpolant(radius(:,1),radius(:,2),radius(:,3)) ;
zi = F(xi,yi) ;
iwant = [xi yi zi] ;