Plot an Array of Structures

PlotAS Linear plot of an arrays of structures
This function is used to plot arrays of structures, like those recieved
from shaperead. It will autorecognize some common coordinate field
names. The user may also specify their own. It will take in all the
LineSpec and PropertyName/PropertyValue inputs plot will take. The
largest limitation of this function is it can only handle one array of
structures at a time. This is primarily to be able to correctly parse
the inputs each time. If you would like to plot multiple arrays of
structures on the same plot, you will have to call plotAS several
times.

Syntax:
plotAS(S)
plotAS(S,LineSpec)
plotAS(S,LineSpec,'PropertyName',PropertyValue)
plotAS(xname,yname,S)
plotAS(xname,yname,S,LineSpec);
plotAS(xname,yname,S,LineSpec,'PropertyName',PropertyValue);
hs = plotAS(xname,yname,S,LineSpec,'PropertyName',PropertyValue);

The following coordinate field names are auto recognized:
x y
X Y
xs ys
Xs Ys
XS YS
Lon Lat
lon lat
Lons Lats
lons lats
LON LAT
LONS LATS

Example 1: Basic Functionality
S = shaperead('usastatehi');
plotAS(S)

Example 2: Adding Linespec
S = shaperead('concord_roads');
plotAS(S(101:end))
hold on;
plotAS(S(1:100),'r')

Example 3: Specificying xfieldname and yfieldname
S.range = 0:1e3;
S.relativePower = S.range.^0.5;
plotAS('range','relativePower',S,'r')
xlabel('Range (m)');
ylabel('Relative Power')

J Sullivan, May 2011