How do I make the step for this list?

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geom_prog = list(range(1, n+1, what?))

I am trying to make is so that if ratio = 2 and n = 8, then the list would be [1,2,4,8]

So somehow I have to put where I put 'what?' a step that is equal to the
(previous number in the list)*ratio???

Posted 14-Oct-15 9:27am

Member 12041738

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Matt T Heffron 14-Oct-15 16:40pm

the range() function doesn't support what you are trying to do.

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Richard MacCutchan · Accepted Answer · 2015-10-14T23:18:00

Solution 1

You need something like:

Python

geom_prog = [x for x in range(1, 9) if (x % 2 == 0) | (x == 1)]

Although that gets all even numbers after 1, so you need to modify the expression to get only powers of 2.

Posted 14-Oct-15 23:18pm

Richard MacCutchan

Comments

phil.o 15-Oct-15 5:22am

"the expression to get only powers of 2"
Something like (x & (x - 1) == 0) ? :)

Richard MacCutchan 15-Oct-15 5:37am

Cool!