Implement the outer product in the function below.

function outer$\_$product$($a: :AbstractVector, b: :AbstractVector$)$

$m=$ length $(a)$

$n=$ length $(b)$

$op=$Array$\{eltype(a)\}($undef$,$ m$,$ n$)$ # initialize an empty array of

type given by a

for $i$ in $1$:$m$

for $j$ in $1$:$n$

op $[i,j]=??**?$

end

end

return op

end

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