How to do indexing?

for i = 1:1:num_rows
              if and(strcmp('$GPGGA', GPGGA(:,1)), not(strcmp('',GPGGA(:,3)(i))))
                  good_data_index(count) = i;
                  count= count + 1;
              end
          end

What is the best way to write GPGGA(:,3)(i)?

Answer 1

[Walter Roberson]

GPGGA(i,3)