Programming challenges: processing vectors and matrices

[Paul Dale]

These are without use. I can think of justification for each of these operations:

1. Sum of elements is one path to the arithmetic mean.
2. Differences of adjacent elements is the method of differences (Babbage differenct engine anyone).
3. Produce of elements leads to the geometric mean.
4. REVLIST might do fun ñ' ñ is a square matrix. ñ' REV(ñ) likewise.
   

Pauli