Hi everybody,

I have several functions operating on one dimensional vectors. 

Within each function the first thing I do is to define variable n holding 
the length of input vector x:

n = length(x)

Is that possible to factor out this pattern somehow from all functions 
definitions? 

(...like 'traits' in Scala)

I mean, to make variable n automatically defined as a length of the first 
argument (which is always a one dimensional vector) of each function?


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