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Re: generating sequences [message #85845 is a reply to message #85844]

Fri, 13 September 2013 13:36

spluque
Messages: 33
Registered: September 2013

Member

On Friday, September 13, 2013 2:56:58 PM UTC-5, Mats Löfdahl wrote:
> On 2013-09-13 21:29, spluque@gmail.com wrote:
>
>> On Friday, September 13, 2013 2:10:40 PM UTC-5, Mats Löfdahl wrote:
>
>>> On 2013-09-13 21:01, spluque@gmail.com wrote:
>
>>>> Hi,
>
>>>
>
>>>> I thought this should be very easy, but I cannot find how to do it IDL. Say we have a vector with a few starting values:
>
>>>
>
>>>> a=[1, 12, 90]
>
>>>
>
>>>> and we want to generate sequences of 3 numbers starting with these values, so that we end up with:
>
>>>
>
>>>> [1, 2, 3, 12, 13, 14, 90, 91, 92]
>
>>>
>
>>>> How is this done in IDL?
>
>>>
>
>>> IDL> print,reform(transpose([[a],[a+1],[a+2]]),9)
>
>>>
>
>>> 1 2 3 12 13 14 90 91 92
>
>>
>
>> What if the sequence for each starting value was 1000 instead of 3?...
>
>
>
> Let's make a sequence of length N. N=1000 will be kind of a waste of
>
> space so let's just do
>
>
>
> IDL> N=7
>
> IDL> print,reform(transpose(rebin(a,3,N,/samp) + [1,1,1] # indgen(N)),3*N)
>
> 1 2 3 4 5 6
>
> 7 12 13 14 15 16
>
> 17 18 90 91 92 93
>
> 94 95 96
>
>
>
>
>
> If you want to generalize the solution further to a of any length, just
>
> substitute n_elements(a) for the number 3 and replicate(1,n_elements(a))
>
> for [1,1,1].

Very impressive, I'll have to study these functions for a while!

Thanks,
Seb

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[Message index]

		generating sequences By: spluque on Fri, 13 September 2013 12:01
		Re: generating sequences By: Mats Löfdahl on Fri, 13 September 2013 12:10
		Re: generating sequences By: spluque on Fri, 13 September 2013 12:29
		Re: generating sequences By: Mats Löfdahl on Fri, 13 September 2013 12:56
		Re: generating sequences By: spluque on Fri, 13 September 2013 13:36

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