MATLAB: Matlab function takes 1 argument, Java caller provides 2

javaMATLAB Compiler SDK

The Mathworks page for an example makesqr.m shows a 1-argument function
% makesqr.m
%----------
function y = makesqr(x)
y = magic(x);
This gets generated into a Java package. However, the `step 16` of the Java invoker shows `makesqr` with *two* arguments.
result = theMagic.makesqr(1, n);
Can anyone please explain this difference in the number of arguments?

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