Sub-Function help!

7 views (last 30 days)
Jay on 13 Mar 2016
Commented: MHN on 14 Mar 2016
I have a homework that I don't understand. This what it says
You need to make a function of [A,B] = mystatistic(Scores).
A = (average of Test 1 ) * (standard deviation of Test 3)
B = (median value of Test2) / (average of Test2)
(1) Use of sub-function
(2) Use of inline function for the sub function
I am not sure how to do [A,B] = mystatistic(Scores). Also I know what is a sub-function but I don't get it here.
Your help is highly appreciated.

Answers (1)

MHN on 13 Mar 2016
Edited: MHN on 13 Mar 2016
Based on the question it seems "Scores" is a N*3 matrix (N shows number of students). You should write a function that outputs A and B. So your main function will look like
function [A,B] = mystatistic(Scores)
To test your program use the following Score as an example (N=10)
Scores = randi(100,10,3) %let assume the exam is out of 100
Now, try the code yourself and if you have question let us know. We are not going to solve your assignment! ;)
MHN on 14 Mar 2016
function [A,B] = mystatistic(Scores)
fid = fopen('TestScoresKim.txt','r'); % open file
headings = fgetl(fid); % read the first line
fgetl(fid); % ignore the second line
Scores = fscanf(fid,'%f'); % read the numbers in the text file
Scores = reshape(Scores,[4 20])'; % put those numbers in a 20*4 matrix
Test1 = Scores(:,2); %2nd column shows test1
Test2 = Scores(:,3); %3rd column shows test2
Test3 = Scores(:,4); %4th column shows test3
A = ((mean(Test1)) * (std(Test3))) % compute A
B = (median(Test2)) * (mean(Test2)) % compute B
But you should also used subfunction, for example you can write the code for mean by yourself (just a loop which sum up the elements of a vector divided by size).

Sign in to comment.


Find more on Environment and Settings in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!