Problem 29. Nearest Numbers

Given a row vector of numbers, find the indices of the two nearest numbers.

Examples:

 [index1 index2] = nearestNumbers([2 5 3 10 0 -3.1])

 index1 =
      1
 index2 =
      3

 [index1 index2] = nearestNumbers([-40 14 22 17])

 index1 =
      2
 index2 =
      4

Notes

1. The indices should be returned in order such that index2 > index1.
2. There will always be a unique solution.