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Re: shorten a vector [message #21627 is a reply to message #21625]

Fri, 08 September 2000 02:04

Martin Schultz
Messages: 515
Registered: August 1997

Senior Member

Liam Gumley wrote:
>
> 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 =
> 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

Good. But why 0+ ???
It works also for
print, a[n<last:*]

Martin

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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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