Type assertion?

@BLI wrote:

I’m playing around with a function where the argument should be a vector of same-sized vectors, i.e.,

v = [v1,v2,v3,...,vN]

where v1, …, vN etc. are vectors containing scalar elements, and of the same size.

How can I test for this in the function call? I tried with:

function myfunc(v::Vector{Vector{Number}})
...
end

but that didn’t work. [And it wouldn’t even have checked that the elements of v were vectors of the same size…]

Question:

• Is there a way to specify the structure of the argument I expect?
• Would it be better to just forget about asserting the argument type, let misuse of the function lead to an error message, and “force” the user (i.e., myself) to re-read the documentation?

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