I have a code with 3 columns. The 2nd. columns should contain a single character that shows if the numbers in the 1st. column is increasing or decreasing.
In other words, if row 2 is greater than row 1 in column 1 then put an "D" else put in an "I".
MeanRelativeError id percentage
0.644952 I 0.00043
0.618256 I 0.006566
0.615946 D -0.000549
0.615686 D 0.004135
0.621896 I 0.006141