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Alex Rivera
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In most OO languages, where variables may point to objects, they may also have a null value, which is highly convenient. In Matlab, I have a function which parses a command, and then returns a cell array, or false (which is equal to zero — which is another common pattern) if it fails: function re = parse(s) ... if (invalid) re = false; return; end end The problem is that when I check the result, it gives an error: re = parse(s); if (false == re) Undefined function 'eq' for input arguments of type 'cell'. I've written a function to check it without an error: strcmp('logical', class(re)) && false == re , but that seems to be really slow for use in hot areas of the code, and also inconvenient if I have to add this function to every M file I'm writing. Using NaN is even worse, because besides throwing that error, it also isn't equal to itself. What's a better alternative for use with this pattern?
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