Louis,
This is standard num* array behavior: arrays are mutable, and MPL is not
making copies of them when you plot, which is a good thing.
by the way, slices of arrays are references too, which is different than
python lists, so it can be surprising, but also useful
# 1st Plot .................
x[0]= 1.0
y[0]= 1.0
x[1]=-1.0
y[1]=-1.0
a.plot(x,y)
# 2nd Plot .................
now you need copies. You can make brand new ones, or use the copy() method:
x = x.copy()
y = y.copy()
you could also pass a copy into the plot method:
a.plot(x.copy(), y.copy())
which is perhaps the behavior you were expecting.
-Chris
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