1. The problem statement, all variables and given/known data Say you've been given vectors v1, v2 and v3. 2. Relevant equations 3. The attempt at a solution How do I construct a matrix out of these three vectors? Am I to use the given vectors as columns or rows in a matrix? When does this matter and when does it not? This may be a stupid question, but I haven't been able to find a clear answer. My textbook constructs matrices in both ways, but I'm never clear as to why they construct them as columns or rows. Does it depend entirely on the context and goal of the question? If there's a clear answer for this, I'd appreciate it, thanks.