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

Create a list where each value (content) of an array is displayed together with its index.

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