One option is to use a CONSTANT property assigned to an object instance. See the doc Setting Constant Property Default section for an example of this that protects against clearing.
Another approach is to use MLOCK in a function with a PERSISTENT variable to prevent the variable from being cleared. For example, create a function like this:
function outPref = myPref(inPref)
mlock;
persistent privatePref;
if isempty(privatePref)
privatePref = 'default';
end
if nargin
privatePref = inPref;
end
if nargout
outPref = privatePref;
end
Now you can store a value in there that persists through clear:
>> q=myPref
q =
default
>> myPref('new')
>> clear all
>> q=myPref
q =
new
