Plotting 3D parametric curves in GUI - English

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Outline:

* About parametric form of a sphere, * Using a Slider to vary the value of a radius, * Using a Text box for displaying the value of radius, * Using an Axes to display the plot, * Auto-generate a Scilab code using GUI Builder Toolbox, * Write a callback function to display the Slider value in a Text box, * Write a user defined function to plot the sphere, * About surf command, * About mesh command, * About meshgrid, * Test the GUI.