mult.jl

function multiply(a::Array{T, 2}, b::Array{T, 2}) where T <: Number
	if size(a, 2) != size(b, 1)
		error("size")
	end

	c = Array{T}(undef, size(a, 1), size(b, 2))
	
	for i = 1:size(a, 1),  j = 1:size(b, 2)
		aux = 0.0
		for k = 1:size(a, 2)
			aux += a[i, k] * b[k, j]
		end
		c[i,j] = aux
	end

	return c
end