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From: Jos (10584) on 14 Jun 2010 05:15
"Meedo " <mohabedalgani(a)yahoo.com> wrote in message <hv4q8s$mbh$1(a)fred.mathworks.com>...
> "us " <us(a)neurol.unizh.ch> wrote in message <hv2gp6$mln$1(a)fred.mathworks.com>...
> > "Meedo " <mohabedalgani(a)yahoo.com> wrote in message <hv204k$huk$1(a)fred.mathworks.com>...
> > > Hi,
> > >
> > > How can i replace a char by another one using its index.
> > >
> > > e.g.
> > >
> > > s='matlab'
> > > s1='a';
> > > s2='A';
> > >
> > > How to replace only the first a (index 2 in the s string) with A, to be
> > >
> > > ans= mAtlab
> > >
> > > Does Matlab provides this kind of string indexing??
> > >
> > > i appreciate any comments..
> > >
> > > Mohammad
> >
> > one of the many other solutions
> >
> > s='matlab';
> > r=regexprep(s,'a','A','once')
> > % r = mAtlab
> >
> > us
>
> Thank you for your reply.
>
> but I was wondering how can i change the letter 'a' using its index
>
> s='matlab2009a';
>
>
> if i would like to change the 'a' in the index 11 (the third a). what should i do?
>
> r=regexprep(s,'a','A','once') % does not support indexing
>
> and
> A(find(d='a',1)) = 'A'; % does not work or may be needs more clarifications
>
>
> please any suggestions...
>
>
> Thanks in advance

Perhaps you're looking for this simple solution?

% data
s='matlab2009a';
index = 11 ;
c1 = 'a'
c2 = 'X'
% engine
if isequal(s(index), c1),
s(index) = c2 ;
end
% result
disp(s)

Note that for this to work, s(index) and c2 should be equally long (or c2 should be a "scalar").

hth
Jos
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