Is there a way to define an "empty" piecewise function? I'd like to do
the following (I've defined my own piecewise_append):
result = <empty piecewise>
for i in range(0,n):
result = piecewise_append(result, some_functions[i])
In reality, I wind up unrolling the first iteration of the loop, so it
looks something like this:
result = some_functions[0]
for i in range(1,n):
result = piecewise_append(result, some_functions[i])
That's not so bad, but it gets ugly with doubly- or triply-nested loops.
Someday I'll have to write a generic piecewise_add that works over
non-uniform intervals, but for now I'd just like to avoid copy/pasting
the first iteration of my loops everywhere.
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