Spoken Tutorial, IIT Bombay 
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			GUI        
 Building a GUI for plotting 3D parametric curves- Assignment



1. Using surf and mesh, build a GUI to plot a 3D hemisphere.
   Parametric equations:
   x = r*cos(theta)*sin(phi) , y = r*sin(theta)*sin(phi) & z = r*cos(phi).
2. Place the hemisphere on a horizontal plane.
3. Change radius r from 1 to 10 using a Slider and display it in a Text box.
4. Consider that theta & phi vary from 0 to pi. 
5. Add grid lines to the plot and label the Axes.