creating a new vector from a matrix using a selection criterion

Hello,

I'm having a problem in a routine I created to parse a data. I have a data, which is attached. I need to calculate the average values ​​that are close to the maximum and the minimum. After that, I need to average those values ​​and then subtract them. I made a routine that takes the values ​​close to the maximum value, but when I set them to a new table, values ​​that do not meet the established criteria are zero in the new vector. I wanted the new vector to have the ordered ones and that there were no valances that did not meet the criteria. The program is also attached.

thank you