help on assignment in struct arrays

[Eric Chassande-Mottin]

hi,

I'd like to replace all occurence of "~" by NaN in a struct array.
here is an example:

> a(1).a=1; a(1).b=2; a(2).a="~"; a(2).b=3; a(3).a="~"; a(3).b=4;
> idx=find([a.a]=="~")
idx =

   2   3

I'm able to find the "~" but don't know how to do the assignment:
> [a(idx).a]=nan
error: some elements undefined in return list
>[a.a](idx)=nan
error: invalid lvalue function called in expression

could anybody please help?

thanks,
eric
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