index.m - create a list of the indices and values of an array

This function displays each value of an array together with its index. It is possible to ignore zeros and/or NaNs and/or to sort the list according to value. The values can be integers or floating point numbers.

EXAMPLES:

>> a=[2,3,NaN;1,2,4;7,0,9];

>> index(a,'sorted')

ans =
3 2 0
2 1 1
1 1 2
2 2 2
1 2 3
2 3 4
3 1 7
3 3 9
1 3 NaN

>> index(a,'sorted','nonans','nozeros')

ans =
2 1 1
1 1 2
2 2 2
1 2 3
2 3 4
3 1 7
3 3 9