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Re: How to create a varying variable? [message #89394 is a reply to message #89388]

Mon, 06 October 2014 08:26

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

On 10/06/14 10:13, Madhavan Bomidi wrote:
> Hello,
>
> I want to create a varying variable, 'varJJJ' as below:
>
> varJJJ = FLTARR(nc,nr)
>
> Here JJJ = STRING(indgen(101),FORMAT='(I03)')
>
> Is this possible? Can anyone have a better suggestion?
>
> Thanks in advance,
> Madhavan

First thing that occurs to me is: why?

I'm not trying to be obstreperous, just asking for some context since
this sort of request is usually more of a design issue than a language one.

cheers,

paulv

p.s. And, FWIW, Matthew's suggestion using a hash is what I would
recommend since you can use the dynamic "JJJ" to access the particular
value that you want. E.g.

IDL> h=hash()

Use string of number:

IDL> jjj='101'
IDL> h[jjj] = findgen(20,10)
IDL> help, h['101']
<Expression> FLOAT = Array[20, 10]

Or use actual number (why convert to string?):

IDL> nnn=101
IDL> h[nnn] = dindgen(14)
IDL> help, h[101]
<Expression> DOUBLE = Array[14]

where, as you can see, h['101'] and h[101] reference different values in
the hash.

If you have an older version of IDL (i.e. no hashes) then you could put
together something similar using pointer arrays.

All of the plumbing (for either methodology) could then be wrapped up
into "Init", "Set" and "Get" functions so your code is protected from
the implementation details.

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[Message index]

		How to create a varying variable? By: atmospheric physics on Mon, 06 October 2014 07:13
		Re: How to create a varying variable? By: Matthew Argall on Mon, 06 October 2014 07:25
		Re: How to create a varying variable? By: Matthew Argall on Mon, 06 October 2014 07:33
		Re: How to create a varying variable? By: Paul Van Delst[1] on Mon, 06 October 2014 08:26

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