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#### 3.7.19 List Tutorial Exercise 1

We can use `v x` to build a vector of integers. This needs to be adjusted to get the range of integers we desire. Mapping ‘`-`’ across the vector will accomplish this, although it turns out the plain ‘`-`’ key will work just as well.

         2:  2                              2:  2
         1:  [1, 2, 3, 4, 5, 6, 7, 8, 9]    1:  [-4, -3, -2, -1, 0, 1, 2, 3, 4]
             .                                  .

             2  v x 9 <RET>                       5 V M -   or   5 -

Now we use `V M ^` to map the exponentiation operator across the vector.

         1:  [0.0625, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16]
             .

             V M ^