Hi Tasos, your nested "ff" conditions only contemplate cases for temp(i) equal to 10, 20, 30 or 40. When temp(i) is differente to any of those values, you have not especified the output.
Besides, your input parameter N is used to create a random 1x N array of number. The function rand(1,N) will return N random numbers in the range [0,1], for wich your temp(i) will always be in the case not contemplated by your nested "if" conditions.
To make you see it clearer, here I send you your code with a simple added line that makes your code work ;):
function [out,temp]=zari(N)
x1=0; %to plithos Z1
x2=0; %to plithos Z2
x3=0; %to plithos Z3
x4=0; %to plithos Z4
sum1=0;
sum2=0;
sum3=0;
sum4=0;
temp= rand(1,N);
for i=1:N
if temp(i)== 10
out(i)=Z1;
x1=x1+1;
sum1=sum1+out(i);
%Z1 edra zariou = 10
else
if temp(i) == 20
out(i)=Z2;
x2=x2+1;
sum2=sum2+out(i);
%Z2 edra zariou = 20
else
if temp(i) == 30
out(i)=Z3;
x3=x3+1;
sum3=sum3+out(i);
%Z3 edra zariou = 30
else
if temp(i) == 40
out(i)=Z4;
x4=x4+1;%Z4 edra zariou = 40
sum4=sum4+out(i);
else
out(i) = 666; % ADDED TO MAKE YOU SEE YOUR MISTAKE
end
end
end
end
