MATLAB: I need help writing a matlab function

doit4mehomework

I need help writing a Matlab function that takes a positive integer n as its argument, and returns the sum of all odd numbers between 1 and n.

Best Answer

Hi Mateo

what about this

function sn=sum_odds(n)
narginchk(1,1);
if(n<0) || (n==0)
    error(message('input error n<=0'));
end
if abs(n-floor(n))>0
    error(message('input not +int'));   
end
sn=sum([1:2:n])
% if rem(n,2)==0
%    sn=sum([1:2:n-1])
% end

% 
% if rem(n,2)>0
%    sn=sum([1:2:n])
% end
end

if you find these lines useful would you please mark my answer as Accepted Answer

To any other reader, if you find this answer of any help please click on the thumbs-up vote link,

thanks in advance for time and attention

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>

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MATLAB: What is wrong with the code in writing a for loop function

size(v) replies a vector, such that i <= size(v) will not do, what you expect.

USe the automatic code indentation to find the problem of using "else if" instead of "elseif" immediately.

Prefer to write a loop like:

for i = 1:numel(v)
 if mod(i, 2) == 1
   ...
 else
   ...

Use v(i) to get the current element, not sum_odd = sum_odd + i, because you do not want to collect the indices - when I assume that your other question contains the text of this homework.

MATLAB: Sum with odd n+k

I am assuming that "

" is scalar and hence taking it as "r", but that shouldn't matter for this question. Also please initialize r, k before attemting to run the code. Here is the sample code:

sum = 0;
for n = 0:k-1
    if mod(k+n, 2) == 1
       sum = sum + (2*n+1)*r; 
    end
end

Note: This is not an optimized code and you may write a more optimized implementation.

Best Answer

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MATLAB: Sum with odd n+k

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