# X_tanspose*x vs. x*x_transpose

x is a vector - (x1,x2, ..., xn)_transpose (i.e. a column vector). so when we have x_transpose*x we have x1^2+ x2^2+...+xn^2 = norm(x)^2.

right...

now what's x*x_transpose, i.e. column times the row? is it an n-by-n matrix?

actually now that i'm finished typing it i'm pretty sure it is, but i'll still post it to be sure..

What does your asterisk mean? Sometimes an asterisk means the complex conjugate of a transpose, but I'm not sure that's how you mean it here.

* means "times" as in 2*2=4

matt grime