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Re: help with idl [message #83193 is a reply to message #71738]

Thu, 07 February 2013 06:28

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Thursday, February 7, 2013 3:26:46 PM UTC+1, Helder wrote:
> On Thursday, February 7, 2013 3:13:36 PM UTC+1, fd_...@mail.com wrote:
>
>> Does anyone know how to create a Toeplitz matrix in idl??
>
>>
>
>>
>
>>
>
>> Best Wishes
>
>>
>
>> Mar
>
>
>
> Well, I'm not sure that this is what you are looking for and I don't think that this is the the "IDL" way, however it does the job:
>
>
>
> IDL> n = 5
>
> IDL> a = make_array(n,n)
>
> IDL> OneLine = findgen(2*n)
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> IDL> FOR I=0,n-1 DO a[*,I] = (shift(OneLine,I))[0:4]
>
> IDL> print, a
>
> 0.000000 1.00000 2.00000 3.00000 4.00000
>
> 8.00000 0.000000 1.00000 2.00000 3.00000
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> 7.00000 8.00000 0.000000 1.00000 2.00000
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> 6.00000 7.00000 8.00000 0.000000 1.00000
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> 5.00000 6.00000 7.00000 8.00000 0.000000
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>
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> Hope it helps.
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>
>
> Cheers,
>
> h

Oh, yeah, to define the general elements you should edit the definition of OneLine. For instance you could try with:
OneLine = [0.0,1,2,3,4,8,7,6,5]

Cheers,
H

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[Message index]

		Help with Idl+Envi By: MaxA on Fri, 16 July 2010 01:42
		Re: help with idl By: Brian Daniel on Thu, 07 February 2013 10:26
		Re: help with idl By: Brian Daniel on Thu, 07 February 2013 10:26
		Re: help with idl By: Helder Marchetto on Thu, 07 February 2013 06:28
		Re: help with idl By: Helder Marchetto on Thu, 07 February 2013 06:26

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