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Re: indexing over structure tags [message #24802]

Thu, 19 April 2001 12:23

tam
Messages: 48
Registered: February 2000

Member

Hmmm.... Well assuming that you want to iterate (for whatever reason)
over a set of names rather than a set of indices how about.

names = tagnames(data)
for i=0,n_tags(data)-1 do begin ; Or any other kind of loop
name = ... entered somehow by the user perhaps ...
w=where(name eq names[i]);
if (w(0) ne -1) then begin
ind = w[0]
data.(ind).values = ...
....

It's easy enough to translate from the variable name to the variable
index -- and the index may itself be a variable.

Tom

Randall Skelton wrote:
>
> Thanks Tom... I did think of that. However, in this particular case there
> is some merit in having the name of the structure be a useful and human
> readable tag. Nobody would be happy trying to remember yet another
> arbitrary numbering scheme for molecules when they'd rather just type the
> name ;) My suspicion is that there isn't an easy way to do what I want...
>
> Randall
>
> On Thu, 19 Apr 2001, tam wrote:
>
>> Just use the numeric tag syntax for structures.
>>
>> for i=0,n_tags(data)-1 do begin
>> data.(i).values = .. some expresion ...
>> endfor
>>
>> where the (i) indicates use the i'th element of the structure.
>> So you don't need to use the names at all.
>>
>> Regards,
>> Tom McGlynn
>>

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[Message index]

		Re: indexing over structure tags By: tam on Thu, 19 April 2001 12:23
		Re: indexing over structure tags By: tam on Thu, 19 April 2001 12:25
		Re: indexing over structure tags By: Paul van Delst on Thu, 19 April 2001 11:08
		Re: indexing over structure tags By: Vapuser on Thu, 19 April 2001 10:36
		Re: indexing over structure tags By: Bernard Puc on Thu, 19 April 2001 10:50
		Re: indexing over structure tags By: tam on Thu, 19 April 2001 10:16
		Re: indexing over structure tags By: Randall Skelton on Thu, 19 April 2001 10:24
		Re: indexing over structure tags By: R.Bauer on Tue, 24 April 2001 00:45
		Re: indexing over structure tags By: Paul van Delst on Thu, 19 April 2001 10:05
		Re: indexing over structure tags By: Paul van Delst on Thu, 19 April 2001 10:00

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