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Re: Subscripting multidimensional arrays [message #37269]

Fri, 12 December 2003 13:35

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Fri, 12 Dec 2003 14:15:33 -0700, Christopher Lee wrote:

> JD Smith wrote:
>> On Fri, 12 Dec 2003 07:55:16 -0700, Christopher Lee wrote:
> <snip>
>>
>> PRODUCT works nicely for this:
>>
>> function linear_indices,array,vec_indices
>> s=size(array,/DIMENSIONS)
>> nd=n_elements(s)
>> if nd eq 1 then return,s[0]
>
> ;you mean "return ,vec_indices" , yes?

Whoops, yes, sorry:

if nd eq 1 then return, vec_indices[0]

>> return,long(total([1.,product(s[0:nd-1],/CUMULATIVE)]*vec_in dices))
>> end
>
> PRODUCT doesn't seem to exist on my IDL installations (5.3->5.6
> inclusive), is it an IDL 6 thing? I've written my own obviously, but not
> with CUMULATIVE. Hopefully the IDL 6 licence will work on Monday.>

Strange, it shipped with IDL5.6.

>
>
>> to go the other direction, IDL6 offers ARRAY_INDICES. Or you can
>> always just resort to:
>>
>> a[vec[0],vec[1],vec[2]]
>>
>>
> Ahem, oops. Apparently I used a cluster bomb to open a can of beans...a
> switch case statement would take care of the dimensions upto the IDL
> limit of 8 dimensions, or using IDL's ability to ignore trailing
> dimensions if they're 0 hack to use 8 dimensions every time.

Yes, but that would be ugly ;). What if IDL increases the 8-dim limit in
the future?

JD

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[Message index]

		Re: Subscripting multidimensional arrays By: JD Smith on Fri, 12 December 2003 13:35
		Re: Subscripting multidimensional arrays By: Chris Lee on Fri, 12 December 2003 13:15
		Re: Subscripting multidimensional arrays By: R.G. Stockwell on Fri, 12 December 2003 11:46
		Re: Subscripting multidimensional arrays By: R.G. Stockwell on Fri, 12 December 2003 11:44
		Re: Subscripting multidimensional arrays By: JD Smith on Fri, 12 December 2003 08:53
		Re: Subscripting multidimensional arrays By: R.G. Stockwell on Fri, 12 December 2003 08:57
		Re: Subscripting multidimensional arrays By: Chris Lee on Fri, 12 December 2003 06:55
		Re: Subscripting multidimensional arrays By: Jonathan Greenberg on Sat, 13 December 2003 12:19

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