title: 3d plot with given 2d data
body: <p>I want to understand how the 2d data is related to z axis to get the 3d plots</p>
  
  <p>let us say that i have <code>x=[-1:0.1:1]</code>, vector </p>
  
  <p>and <code>y=[1 2 3 4 5 4 3 2 1 0]</code></p>
  
  <p>a plot of y Vs x will have peak of 5 and slope down to both sides at x=0.5
  how to relate these data in 3d to get the bell shape surface, with similar characteristics.</p>