MATLAB: How to sum values of (x plus x-i) for (i=1 to x-1) using a while loop

while loop

As a disclaimer, this is not homework. It is from an independent program which my instructor has given to anyone wanting additional MATLAB practice.
So here is my code
function summedValue = SummationWithLoop(userNum) % Summation of all values from 1 to userNum
    summedValue = 0;
    i = 1; 
    % Write a while loop that assigns summedValue with the 
    % sum of all values from 1 to userNum    
    while i<userNum
    summedValue=userNum+(userNum-i)
    i=i+1
end
What i want to do is input a value (say 5) and get the sum of (5+4+3+2+1=15) The pseudo code would look like the initial question above. Can you help correct this code I attempted to write?

Best Answer

sum(1:userNum); % better practice of MATLAB
and variant for your "dance":
summedValue = 0;
userNum = 5
while userNum ~= 0
    summedValue = summedValue + userNum;
    userNum = userNum - 1;
end
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