Why must have brackets around 'student'?

function avg=avgscore(testscores,student,first,last)
for k=first:last
    scores(k)=testscores.(student).week(k);
end
avg=sum(scores)/(last-first+1)

Why must have brackets around 'student'?

[Jan]

To be exact: "brackets" are [ and ], while ( and ) are called "parentheses".

Answer 1

[madhan ravi]

https://in.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html - this is why