Le 01/10/2015 22:06, Samuel Gougeon a écrit :
.../...
3. Clarify "a:b:c" ranges when one of a, b or c is infinite (%inf) or
Not a Number (%nan); or when b is 0.
.../..
What about this alternative?:
By decreasing priority (read "else" at the end of each line):
a) if stop is %nan => error
b) if start or step is %nan => returns %nan
c) = iii): if start < end && step < 0 => return [], even if start,
step or stop is/are inf/-inf
d) = iv): if start > end && step > 0 => return [], even if start, step
or stop is/are inf/-inf
e) if neither |start| nor |stop| are inf, && |step|==inf => return start
.
Actually, even if |start| is inf, returning start (so +/-inf) would be
relevant.
Updated proposal:
a) if stop is %nan => error
b) if start or step is %nan => returns %nan
c) = iii): if start < end && step < 0 => return [], even if start, step
or stop is/are inf/-inf
d) = iv): if start > end && step > 0 => return [], even if start, step
or stop is/are inf/-inf
e) if|stop| ~= inf && |step|==inf => return start (even if it is +-inf)
f) if start or stop or both are inf or -inf => error, even when |step|
is inf
g) otherwise: normal computation.
Samuel
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