## 16 Matrix Manipulation

There are a number of functions available for checking to see if the
elements of a matrix meet some condition, and for rearranging the
elements of a matrix. For example, Octave can easily tell you if all
the elements of a matrix are finite, or are less than some specified
value. Octave can also rotate the elements, extract the upper- or
lower-triangular parts, or sort the columns of a matrix.