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Re: shorten a vector [message #21629 is a reply to message #21627]

Thu, 07 September 2000 19:30

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Andrew <noymer@my-deja.com> wrote in message
news:8p9gie$6m5$1@nnrp1.deja.com...
> What's the easiest way to shorten an array by n units
> by chopping off the first n elements of the array.
>
> E.G: I want to make [ 4 6 7 20 15 ]
>
> Into [ 6 7 20 15]. Here n=1.

a = [4, 6, 7, 20, 15]
n = 1
print, a[(0 + n):*]
6 7 20 15

To make it more general, use n_elements to get the index of the last
element:

last = n_elements(a) - 1
n = 1
print, a[(0 + (n < last)):*]
6 7 20 15
n = 4
print, a[(0 + (n < last)):*]
15
n = 10
print, a[(0 + (n < last)):*]
15

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Re: shorten a vector By: Liam E. Gumley on Fri, 08 September 2000 08:33
		Re: shorten a vector By: Martin Schultz on Fri, 08 September 2000 02:04
		Re: shorten a vector By: Liam E. Gumley on Thu, 07 September 2000 19:30

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