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Re: Duplicating an array help [message #90844 is a reply to message #90843]

Mon, 27 April 2015 10:04

Russell[1]
Messages: 101
Registered: August 2011

Senior Member

On Monday, April 27, 2015 at 11:10:54 AM UTC-4, Jeremy Bailin wrote:
> On Monday, April 27, 2015 at 8:41:15 AM UTC-5, rryan%s...@gtempaccount.com wrote:
>> On Friday, April 24, 2015 at 7:02:42 PM UTC-4, Joe Llama wrote:
>>> I'm not entirely sure how best to phrase what I am trying to do but essentially I am trying to find a function that does something like this (but without the loop):
>>>
>>> x = findgen(5)
>>> y = x
>>> for i = 0, 100 do y = [y, x]
>>>
>>> So I then have an array [0,1,2,3,4,0,1,2,3,4...] 100 times. Is there a way of doing this without the loop?
>>>
>>> Thanks!
>>
>> I fully endorse the other answers as better than this. But given what yo wrote, you might also consider the "mod" operator:
>>
>> x= findgen(500) mod 5
>>
>> -Russell
>
> You probably really want indgen or lindgen -- taking the modulus of a float isn't a good idea and can cause unwanted results!
>
> -Jeremy.

No, you're right. I was being a bit cavalier and working without actually testing anything.

But one should probably use rebin() for this purpose. I just thought mod was worth mentioning because the problem may need to be generalized to another environment where rebin() isn't an option.

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[Message index]

		Duplicating an array help By: joellama on Fri, 24 April 2015 16:02
		Re: Duplicating an array help By: don.woodraska on Fri, 24 April 2015 16:20
		Re: Duplicating an array help By: wlandsman on Fri, 24 April 2015 16:30
		Re: Duplicating an array help By: Jeremy Bailin on Sat, 25 April 2015 10:06
		Re: Duplicating an array help By: rryan%stsci.edu on Mon, 27 April 2015 06:41
		Re: Duplicating an array help By: Jeremy Bailin on Mon, 27 April 2015 08:10
		Re: Duplicating an array help By: Russell[1] on Mon, 27 April 2015 10:04

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