From the help:"n = norm(v,p) returns the vector norm defined by sum(abs(v)^p)^(1/p), where p is any positive real value, Inf, or -Inf."
So the function would just be a wrapper for norm where v = x2-x1. That should be all you need. It's literally 2 lines of code: a function line and a call to norm() that returns the return value. It even tells you what norm() does so if you didn't want to use the built-in norm(), you could calculate the sum yourself.
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