How to 'overload' functions

[jiaguo]

Hi

I want to write a function with the same name of 'size' as the
one already exsists in octave. In this new function, I will
calculate the size of a new data type, if the input is the new
data type. Otherwise, I will call the octave size function. 

I implemented it in DLD function and run octave at the same
directory as it is.However, when I call 'size(x)' in octave,
it always call the octave size function instead of my DLD size
function. Can anyone tell me how to 'overload' functions and
how to specify which size function to run? 

Thanks,

Jia



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