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Assigning a variable in a function that is available in the function
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I have a function which creates variables (which I want to use in the function only) that are listed in a file that contain the actual variable name and the associated starting/default value. I have tried assign(ws, 'var', val) where 'var' and val come from the file. The problem is these are being assigned to he base ws (regardless if ws = 'base' or 'caller'). I thought I could use evalin but that function needs to know the name of the variable you want to assign it to and that name comes from the file.
3 commentaires
Sean de Wolski
le 14 Oct 2014
That sounds really difficult. Can you provide an actually minimal working example. You should not use or need eval to do this.
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Robert Cumming
le 14 Oct 2014
Create a sub function which assigns (using assignin) your variables in the caller function where the caller function is the one where you actually want the variables.
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Matt J
le 14 Oct 2014
Modifié(e) : Matt J
le 14 Oct 2014
Methods that avoid eval and assignin are preferable (by far) for this kind of thing. You should use load as Sean suggested, but with an output argument
defaults=load('YourFile.mat');
You should also have the user provide a similar structure whose fields are the overrides
override.var1=val1
override.var2=val2;
etc...
Now you just loop through the fields of "defaults" and replace with overrides as needed,
settings=defaults;
fnames=fieldnames(settings);
for i=1:length(fnames)
if isfield(overrides,fnames{i})
settings.(fnames{i})=overrides.(fnames{i});
end
end
The desired data are now all in the fields of the structure "settings". If you strongly prefer them unpacked into separate variables, you could do so with STRUCTVARS ( Download ).
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