language agnostic - How do I convert a stereo wav to mono -

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If I already have data in two arrays (left channels and right channels) then how to change them Is a single mono array for?

Is there a function, so that mono [x] = f (l [x], r [x]) ?

The mixture is the average of two channels. 

  f_mono = function (l, r) {returns (L + R) / 2; }

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