Let's assume you have the matrix:
Data = [1 96;2 75;3 88;4 30;5 60;6 14;7 88];
with column ordering as specified in your question.
Let's look for all students who scored 60 or more.
predicate = Data(:,2)>=60; %%find entries in the second column that are >= 60
rData = Data(predicate,:); %%return only the rows where the predicate is true
The rData matrix contains both the student id's and scores.
ids = rData(:,1); %%Get student id's
scores = rData(:,2); %%Get the corresponding scores
