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From: Matt J on 1 Jul 2010 14:57
"Maarten van Reeuwijk" <m.van.reeuwijk(a)erase.gmx.net> wrote in message <i0im8l$6ae$1(a)fred.mathworks.com>...
> "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i0iiij$2pu$1(a)fred.mathworks.com>...
> > "Maarten van Reeuwijk" <m.van.reeuwijk(a)erase.gmx.net> wrote in message <i0ieh4$7ht$1(a)fred.mathworks.com>...
> >
> > > I do this because calculations are generally rather complex, the code will get very cluttered if I have to prefix all the variables . However, I am open to better suggestions on how to unpack this structure in a generic way.
> > ==============
> >
> > See the following FEX submission for a safer compromise
> >
> > http://www.mathworks.com/matlabcentral/fileexchange/26216-structure-fields-to-variables
>
> Many thanks for this excellent idea. I thought I would write the commands to a file
>
> function unpackstruct(S, name)
> str = structvars(S);
> h = fopen(['unpack_', name, '.m'], 'w');
> vnam = fieldnames(S);
> for i=1:length(vnam);
> fprintf(h, [vnam{i},'=',name,'.',vnam{i}, ';\n']);
> end
> fclose(h);
>
> and then include the file in my function and execute
>
> unpackstruct(sim, 'sim');
> unpack_sim;
=================

I'm not sure where the line str=structvars(S) fits into this approach. You aren't using str anywhere later in the code.

I'm also not sure why you insist on doing a run-time automation of the the structure unpacking. What advantage does this bring you over just putting explicit lines of code varname=S.varname into your file, when these lines of code can be generated effortlessly using structvars?
From: us on 1 Jul 2010 17:39
"Maarten van Reeuwijk"
> > a.beta = 2;
> > beta = 0;
> > eval('beta = a.beta;')
>
> Thank you, that does solve the problem. beta is the only variable causing problems.
>
> Maarten

i'm aware that this thread has gone for a while and (better) solutions have been proposed...
however, i'm still very curious as to why this particular example does NOT work(!?)...

clear a beta; % <- start afresh...
a.beta=2;
eval('beta=a.beta;');
beta
% beta = 2
num2str(beta)
% ans = 2
% what do you get(?)...

us
From: Matt J on 1 Jul 2010 21:15
"us " <us(a)neurol.unizh.ch> wrote in message <i0j1to$jld$1(a)fred.mathworks.com>...
> "Maarten van Reeuwijk"
> i'm aware that this thread has gone for a while and (better) solutions have been proposed...
> however, i'm still very curious as to why this particular example does NOT work(!?)...
>
> clear a beta; % <- start afresh...
> a.beta=2;
> eval('beta=a.beta;');
> beta
> % beta = 2
> num2str(beta)
> % ans = 2
> % what do you get(?)...
================


Run this same code inside a function. The result I get is

??? Error using ==> beta at 21
Not enough input arguments.
From: us on 1 Jul 2010 21:39
"Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i0jeit$agn$1(a)fred.mathworks.com>...
> "us " <us(a)neurol.unizh.ch> wrote in message <i0j1to$jld$1(a)fred.mathworks.com>...
> > "Maarten van Reeuwijk"
> > i'm aware that this thread has gone for a while and (better) solutions have been proposed...
> > however, i'm still very curious as to why this particular example does NOT work(!?)...
> >
> > clear a beta; % <- start afresh...
> > a.beta=2;
> > eval('beta=a.beta;');
> > beta
> > % beta = 2
> > num2str(beta)
> > % ans = 2
> > % what do you get(?)...
> ================
>
>
> Run this same code inside a function. The result I get is
>
> ??? Error using ==> beta at 21
> Not enough input arguments.

of course(!)...
i completely overlooked the fact that the OP ran the code within a function...
sorry - and: case closed...

us
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