See if you can put a row at the beginning that's column names, like
c1, c2, c3
Is that a possibility? If so, it makes it easier since you can use readtable().
Then try readtable() to read it in
t=readtable(filename);
Then sort the third column. Extract the third column like
column3 = t.c3;
then see if you can use sort(). Take both outputs of sort. Use the sort order to sort the rows of the other columns. Is this homework? If not, attach your data file.
