Tutorial info -- Do NOT put blank lines in code; as you see it reverts to word wrap instead of code formatting. As previously noted, to enter code, put two blanks in front of the first line in the new paragraph.
That aside, what is removeTerms?; I don't recognize it as basic Matlab function.
If JT_S_TN is your data array, simply write
correct=JT_S_TN(~failed,:); % extract those not failed
