If you want matlabFunction to produce a vector for several arguments, in the 'Vars' argument, enclose them in square brackets to concatenate them.
Example —
syms a b x1 x2 x3
f = a*x1 + b*x2 + x3
F = matlabFunction(f, 'Vars',{a,b,[x1,x2,x3]})
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The ‘x’ arguments will appear as a row vector of ‘in3(1)’, ‘in3(2)’ and ‘in3(3)’ however when you call the function, you can of course name the arguments anything you want. Also, the arguments in the square brackets can be any arguments you want, including all of them. They do not have to be any specific subset.
This is a general illustration, however it will work for any function you choose as a function argument to matlabFunction.
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EDIT — Corrected typographical errors.
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