MATLAB instructions for HW#9

(Writing a Gram-Schmidt function)

`dot(u,v)` returns the dot product of vectors `u` and `v`.

`norm(v)` returns the length (not # of entries) of the vector `v`.

`A=[A x]` appends the vector `x` as a new column of `A`.

`size(A,2)` returns the number of columns of `A`.

`A(:,j)` indicates the jth column of `A`, and may be used for reading and writing.