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Re: indexing over structure tags
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
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.
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...
> 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