On 2016-10-31 22:09, devers.meetthebadger.ja...@gmail.com wrote:
http://imgur.com/a/rfGhK#iVLQKSW
How do I code a function that returns a list of the first n elements of the
sequence defined in the link? I have no idea!!!!!
So far this is my best shot at it (the problem with it is that the n that i'm
subtracting or adding in the if/else part does not represent the element's
position, but just the n that I am plugging into the function):
def reca(n):
rlist=[0]
while len(rlist) < n:
if (rlist[-1]-n) > 0 and (rlist[-1]-n) not in rlist:
rlist.append(rlist[-1]-n)
else:
rlist.append(rlist[-1]+n)
return(rlist)
When you're calculating a[n], what's n?
Well:
When you're calculating a[1], you already have a[0], or 1 element.
When you're calculating a[2], you already have a[0] and a[1], or 2 elements.
So, in general, when you're calculating a[n], you already have a[0] ...
a[n - 1], or n elements.
The value of n is the length of the list so far.
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