How to use interpolation function

hi MATLAB community, i want to interpolate for power between three variables i.e displacement,trim and speed. I am trying to use interp3 but it keeps giving me error that atleast 2 sample points are needed.I'm not good in coding so if you can help it would be much appreciated. This is just an example to get an understanding of the interpolation function.And how can i plot the 3D figure of my result.

if true
  % disp(:,1) = 25000;
speed(:,1)=[10;12;14;15.5];
trim(1,:) = [-4,-2,0,2,4];
pow = [1595,1517,1452;2876,2742,2589;4909,4751,4478;7401,7148,6775];
x=rand;
y=rand;
z=rand;
Vq = interp3(disp,speed,trim,pow,x,y,z);
end
attach