Compass Plots
The compass function shows vectors emanating from the origin of a graph. The function takes Cartesian coordinates and plots them on a circular grid.
This example shows a compass plot indicating the wind direction and strength during a 12-hour period. Two vectors define the wind direction and strength.
wdir = [45 90 90 45 360 335 360 270 335 270 335 335];
knots = [6 6 8 6 3 9 6 8 9 10 14 12];
Convert the wind direction, given as angles, into radians before converting the wind direction into Cartesian coordinates.
rdir = wdir * pi/180;
[x,y] = pol2cart(rdir,knots);
compass(x,y)
Create text to annotate the graph:
desc = {'Wind Direction and Strength at',
'Logan Airport for ',
'Nov. 3 at 1800 through',
'Nov. 4 at 0600'};
text(-28,15,desc)
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