gpa calculator with matrix

I want to make n by 2 matrix and put the grades for first column and second one fore the units (credits) of the grades and then ask to take the numbers from the user and then clculate the gpa

I tried such an script :

and I don't know what to do any more

I will be so thankful if someone help me

% matrix as a gpa calculator
n = input ('"n" value =') , % n is the number of lessons and grades  ???????

Answer 1

[David Hill]

Why not just input the matrix?

m=input('matrix of grades and units, for example [3.5,4;2.7,2;4.0,3;3.3,2]');
gpa=sum(prod(m,2))/sum(m(:,2));

[Milad Houshmand]

Why does this error come out? :

Index in position 2 exceeds array bounds.

Error in matgpa (line 2)

gpa=sum(prod(m,2))/sum(m(:,2));

and to reply your question I want myself give the matlab all the grades with their credits?

It will be more general

[David Hill]

You have to enter the matrix correctly. If you copy and past the example, you should not get an error.

m=[3.5,4;2.7,2;4.0,3;3.3,2];

m =

    3.5000    4.0000
    2.7000    2.0000
    4.0000    3.0000
    3.3000    2.0000

[Milad Houshmand]

you are completely right, but as I said If it is possible lets make it general to ask the users to put the grades for firs column and as the units for the srcond column then operate for gpa . It will be much better and more useful.

.

[David Hill]

Ok, make two inputs