comp.lang.idl-pvwave archive: archive » Duplicating an array help

Home » Public Forums » archive » Duplicating an array help

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Duplicating an array help [message #90837 is a reply to message #90834]

Fri, 24 April 2015 16:20

don.woodraska
Messages: 13
Registered: October 2005

Junior Member

On Friday, April 24, 2015 at 5:02:42 PM UTC-6, 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!

This would probably work. It's not very readable, but it's only one line. Your code produces a 510 element array, so I used rebin with 102 as the second dimension then flattend it. I don't know how memory efficient this is.

z=(rebin(x,5,102))[*]

You can check if it's the same. I ran your example and calculated the sum of squared differences to be 0.

print,total((z-y)^2)
0.00000

Don

Report message to a moderator

[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

Previous Topic:	how did I get here?
Next Topic:	Can the underlying algorithm used in CONTOUR be accessed somehow?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 15:48:37 PDT 2025

Total time taken to generate the page: 0.00982 seconds