+ Create a function to draw circle

drawCircle.m

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+function h = drawCircle(x,y,r)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% function h = drawCircle(x,y,r)
+% Task: Draw a circle providing its center and radius
+%
+% Inputs:
+%	- x: the x-coordinate of the circle center (in m)
+%	- y: the y-coordinate of the circle center (in m)
+%	- r: the radius of the circle center (in m)
+%
+% Outputs: 
+%	- h: a reference to the plot figure
+%	
+%
+% author: Guillaume Gibert, guillaume.gibert@ecam.fr
+% date: 14/09/2021
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% holds the previous drawing
+hold on;
+
+% generates samples in the range [0, 2pi]
+th = 0:pi/50:2*pi;
+
+% computes (x,y) samples along the circle perimeter
+xunit = r * cos(th) + x;
+yunit = r * sin(th) + y;
+
+% plots the samples
+h = plot(xunit, yunit, 'r');