Show all indices of I in [C,I] = max(...)

I am trying to show all of the row values that share a maximum value of a certain column. How do I show all indices for this instead of just the first index?

A sample array would look like:

1 9

2 9

3 4

4 5

I need an output of I = 1 and I = 2 because they share the max value of nine.

Answer 1

[Walter Roberson]

target_value = max(TheColumn);
find(TheColumn == target_value)