Save all but some fields of a struct to a file in MATLAB

Question

I have a struct variable which is parameters with some other variables ex foo1 ,foo2. parameters has 20 fields. ex. a,b,c,d,e ... I want to save only 18 fields. I don't want to save parameters.a and parameters.b. So I want to save parameters except the fields a and b and foo1 and foo2. How can I do this?

Answer 1

You can either remove the fields before saving it with rmfield.

tosave = rmfield(parameters, {'a', 'b'});
save(filename, '-struct', 'tosave');

or you could get a listing of all fields, remove the fields you don't want and then pass these to save. This has the added benefit of not having to make a copy of the struct.

% Get all fields of parameters
allfields = fieldnames(parameters);

% Remove the fields you don't want to keep
fields = allfields(~ismember(allfields, {'a', 'b'}));

% Now save the rest
save(filename, '-struct', 'parameters', fields{:});

Or as @excaza notes, you can craft a regular expression with the -regexp flag to exclude the variables you don't want.