# Adding a line to my plot3 of a plane

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I am having a bit of a problem adding a line to my plot3 of a plane. This is my code for plotting just the plane
X = Final(1,:,:);
Y = Final(2,:,:);
Z = Final(3,:,:);
plot3(X,Y,Z,'o','color','b');
and it gives me this plot, which is what I want : But then I wanted to add position vector to it - and as I understood it then its just a line from point b to projection of b onto the new plane (which is what is in the plot above).
So I just chose one of the original points as the p1 and p2 as the projection of it and then wanted to plot a line between them and add to the plot above. There I am having the trouble.
%Position vector
p1 = [200; -107; 0] %%original point
p2 = [201 ; -105; 3] %projected point
X = Final(1,:,:);
Y = Final(2,:,:);
Z = Final(3,:,:);
hold on
plot(p1,p2) %line plot
plot3(X,Y,Z,'o','color','b');
grid;
hold off This is the result, but I was hoping for something like this: Two lines should be fixed:
1- coordinates of end points of the line
2- Using plot3
%Position vector
p1 = [200; -107; 0] %%original point
p2 = [201 ; -105; 3] %projected point
px=[100 , 101];
py=[-107, -105];
pz=[0,3];
X = Final(1,:,:);
Y = Final(2,:,:);
Z = Final(3,:,:);
hold on
plot3(px,py,pz) %line plot
plot3(X,Y,Z,'o','color','b');
grid;
hold off