Taking the COLMEAN of the following matrix:

a = {{1, 4, 7},

{2, 5, 8},

{3, 6, 9}};

b = colmean(a);

produces a row, or vector, of the following values:

b == {{2, 5, 8}}

Taking the TRANSPOSE of the above row vector produces a column vector. You can use this vector to perform vector calculations.

transpose(b) == {2,

5

8}

See the section entitled "Statistical Analysis" later on in this chapter for further examples of functions that produce a vector from a matrix.