vector - What does the comma mean in the arctan operator? -


i reading the answers question finding angle between 2 vectors in 3d space. signed angle between 2 3d vectors same origin within same plane. answer shown here: 

atan2((vb x va) . vn, va . vb)

is need, don't understand commas operator is. know exes , dots cross products , dot products respectively. don't think commas inner products (same thing dot products)? perhaps, syntax of programming language?

the language (i think1) matlab, , comma argument separator (not operator2) in method call.

1 - consistent context found expression, though suspect author using matlab syntax way of expressing mathematical concept.

2 - according https://au.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html


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