Summarizing numbers using a loop

Im trying to get the hang of matlab and one exercise i found was to summarize all integers 1-100. It is too easy just using the sum function but my loop won't work.

 n=0;
 sum=0; 
 if n<101 %if n is less than 101 (i wan't to include 100) - do the following:
     n=n+1; %add 1 to n
     sum=sum+n; %add n to sum
 end
 sum %display sum 

end

I get sum=1, why?

Answer 1

[Geoff Hayes]

Olle - your code seems to be missing the for loop so I suspect that is the reason that you are only getting a value of 1. Consider the following

 mySum = 0;
 for k = 1:100
     mySum = mySum + k;
 end

We iterate over each integer from 1 to 100 and add that value to our running total (the mySum variable). (You were using a variable named sum to do the same thing. I recommend against this since sum is a built-in MATLAB function and "replacing" the function with your local variable will cause unexpected errors if you then choose to use the sum function.)

See loop control statements for examples on how to repeat blocks of code.

[Olle Haglund]

Thanks man! I actually found a solution using a while loop instead. But it's good to know more than one way.