Calculating the sum of A elements which are numbers between 30 and 65

Hey, i need help with school assignment, i have created an array of 8 rows and 20 columns whose elements are random numbers between 10 and 100:

A=randi([10,100],8,20);

i have to find the elements in A which are between 30 and 65! and Calculate the sum of these numbers.

this is what i got so far:

A=randi([10,100],8,20);
for i=1:8
    for j=1:20
        if A(i,j)>30 & A(i,j)<65
               sum A(i,j)
        end
    end
end

And this only shows the first if argument, and the sum is 401 which i think is the sum if hiw many numbers are greater than 30.

Now my teacher says we have to use this format which i dont understand why:

s=0;
N=0;
for i=1:8
    for j=1:20
        if...

Answer 1

[David Hill]

You had it!

A=randi([10,100],8,20);
B=0;
for i=1:8
    for j=1:20
        if A(i,j)>30 && A(i,j)<65
               B=B+A(i,j);%B is the sum of all elements of A between 30 and 65
        end
    end
end

[Karem Kassem]

Thanks Man ! Do you have any idea why i have to put s = 0 N = 0 in the beginning?

Answer 2

[jannat alsaidi]

No need to initiate two values s and N, only one for accumulator.

[Karem Kassem]

Thanks !