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Re: Unpacking algorithm [message #39324 is a reply to message #39322]

Sun, 16 May 2004 08:19

Christopher Lee
Messages: 4
Registered: February 2001

Junior Member

> v0=[0 x1 x2 x3 0 x4 x5 x1 0 x2 x3 x4 0 x5 x1 x2 0 x3 x4 x5]
>
> I just want to get rid othe zeroes (every fourth element)shown in vector
> v0

n=n_elements(v0)
s=4
index=(findgen(s,fix((n+3)/s)))[1:s-1,*]
index=reform(index, n_elements(index))
;index skips all of the mod 4 indices
new_v=v0[index]

;or even shorter, if n_elements(v0) mod s = 0

s=4
v0=reform((reform(v0,s,n_elements(v0)/s))[1:s-1,*],n_element s(v0)*(s-1)/s)

Chris.

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[Message index]

		Re: Unpacking algorithm By: Timm Weitkamp on Mon, 17 May 2004 06:41
		Re: Unpacking algorithm By: MKatz843 on Sun, 16 May 2004 21:37
		Re: Unpacking algorithm By: Christopher Lee on Sun, 16 May 2004 08:19
		Re: Unpacking algorithm By: Tmorri on Sat, 15 May 2004 16:00

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