Find the sum of all the numbers of the input vector x.
Examples:
Input x = [1 2 3 5] Output y is 11
Input x = [42 -1] Output y is 41
Solution Stats
Problem Comments
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31 Comments
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28 older comments
James
on 21 Feb 2012
If x is 3x3 (or 3x3x3) or similarly shaped vector, sum(x) doesn't automatically add up all of the numbers in the entire vector. You need a loop to go through each dimension of x to get the sum of every element.
Ali
on 8 Mar 2012
James, a vector traditionally denotes a 1xd or dx1 matrix (with d > 1). If d = 1, we tend to call that a scalar.
Rohan Kale
on 16 Jun 2012
Firstly you'd need to vectorize the elements as in suppose x is 3x3 or any size mxp, let y=x(:); now you can find the sum by employing the function sum,i.e,sum(y);
VIVEK RUHELA
on 12 Nov 2014
What is the size of vector....is it [1*n] or [n*m]
AM
on 28 Nov 2015
Well said, Rohan.
Gage Noyes
on 23 Dec 2015
I'm only commenting for the badge
Ebony
on 27 Jan 2016
Why is the solution larger when I call it a single? Additionally, how can I make my solution:
' function y = vecsum(x)
y = sum(x);
end '
smaller?
Folds the Paper Man
on 8 Mar 2016
solved it on first try
ZeHua Xiao
on 18 Sep 2016
You don't need write x=[1 2 3 5]. He ask us write a function. So, it should be y=sum(x).
Michael Bohorquez
on 17 Dec 2016
Easy
Gan Wee Ting
on 20 Dec 2016
thank you
sim yoke meng
on 20 Dec 2016
nice
Adi Zabidi
on 27 Dec 2016
yay
Kunwar Abdul Rahman
on 27 Dec 2016
nice
Abubaker SHERIF
on 29 Dec 2016
very easy
MEI HUEI LIM
on 30 Dec 2016
yes
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
can i get the answer?
Stephan
on 8 Jun 2017
Easy to solve. But how to reach better result???
tanmoy mulo
on 14 Aug 2017
y=sum(x)
Mohamed Atyya
on 30 Oct 2017
good
Chase Kuhn
on 6 Apr 2018
Great Problem!
yubari
on 9 Apr 2018
good usage of ans
Subhadeep Koley
on 5 Aug 2019
Nice one.
Nhat Lam Nguyen
on 10 Sep 2019
great problem
Jillian Beacon
on 13 Sep 2019
vecsum doesn't work in my 2018b software and I can't find vecsum in my documentation. Where is it?
Fakhteh Ghalami
on 8 Nov 2019
y=sum(A)
hashim khan
on 14 Nov 2019
y=sum(x) is not working
Alessandro A
on 10 Feb 2020
Easy!
niket chandil
on 8 May 2020
It's easy. A good problem to start for beginners!
Ankit Jain
on 26 May 2020
good
Batuhan CELIK
on 29 May 2020
good question
Solution Comments
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1 Comment
Mostafa Hany Khattab
on 4 Jun 2020
It's easy when you're turning it into a column vector
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2 Comments
Maryam HCTRAK Yousef
on 26 Mar 2020
idk
Jyothsna Chintala
on 21 Apr 2020
good
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2 Comments
Maryam HCTRAK Yousef
on 26 Mar 2020
i need help
Maryam HCTRAK Yousef
on 27 Mar 2020
i am studying to know how to solve this one
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1 Comment
Neil Sommerville
on 31 Jan 2020
How can the leading solution size be 7?
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2 Comments
Sieu nhan
on 25 Sep 2019
good idea
Le Manh Long Le Manh Long
on 26 Sep 2019
ddd
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1 Comment
math union math
on 27 Aug 2019
one of the simplest task.
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2 Comments
Kristopher Powers
on 23 Oct 2018
Please remove this is a misleading solution.
Hongwei Zhu
on 27 Mar 2020
Hmmm, are you sure this is the leading solution?
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1 Comment
Haojiang YING
on 18 Oct 2017
Come on, this one is so easy
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1 Comment
Matthias Witkowski
on 8 Aug 2017
lets go
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1 Comment
MATLAB_User_19
on 26 Jul 2017
I used the "sum" function to solve this problem really quickly.
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2 Comments
irem erezn
on 17 Jan 2017
Why doesn't it work?
function y=vecsum(x)
y=symsum(x(i),i,1,size(x));
end
Savas Yaguzluk
on 27 Feb 2019
Because you are doing it wrong!
You should check the basis of 'sum' topic in the help.
Here you go: https://www.mathworks.com/help/matlab/ref/sum.html?searchHighlight=sum%20vector&s_tid=doc_srchtitle
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1 Comment
SIVAPRAKASH DANABALASINGAM
on 10 Jan 2017
very easy
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1 Comment
Devan Rao
on 10 Jan 2017
nice
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1 Comment
Devan Rao
on 10 Jan 2017
easy
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1 Comment
TAYALAN SIVALINGAM
on 29 Dec 2016
good job
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1 Comment
Haitong Ye
on 23 Oct 2016
Nice!
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1 Comment
David Verrelli
on 3 Sep 2018
This user appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
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1 Comment
SUBROTA HALDER
on 1 Sep 2016
easy :)
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3 Comments
Md.Farhad Hassan
on 25 Jul 2016
can anyone please help me to find out the where is the mistake, i am a new learner .........
Atsushi Ueno
on 25 Jul 2016
You have to define a function vecsum() like:
function y = vecsum(x)
y=0;
for x= 0:1:10
y=x+y;
end
end
because your answer is executed by calling function in test suite below. The function's name is decided by problem creater.
Savas Yaguzluk
on 27 Feb 2019
What is your code Sir?
If you write your code here, I can say where is the mistake.
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1 Comment
Pim van der Sluis
on 23 May 2016
This solution works.
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1 Comment
lis coffey
on 14 Jul 2016
unable to find the sum of all numbers in input vector, so the test set is correct. I make my solution: ' function y = vecsum(x) y = sum(x); end ' smaller?
Thanks
http://www.fixithere.net/sky-customer-service/
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1 Comment
Sierra McGee
on 13 Nov 2015
Yay! I got it right! Omg I'm so happy!
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1 Comment
Sierra McGee
on 13 Nov 2015
What does this solution mean. In other words, can someone explain the solution step-by-step.
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1 Comment
Yan Xu
on 22 Apr 2015
Good question!
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4 Comments
Show
1 older comment
VIVEK RUHELA
on 14 Nov 2014
why y=sum(x) is wrong. Still I made the same function on MATLAB software and it runs and give correct answer. Can anybody tell me whats going on......
Tim
on 14 Nov 2014
The "y=" is missing from "y=sum(x)".
VIVEK RUHELA
on 15 Nov 2014
@Mr. Tim . Atleast You give me positive reply.Thanks a lot.Can I further talk to you regarding MATLAB CODY Guidence..
Tim
on 19 Nov 2014
Sure, ok.
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1 Comment
Carlos Pavon
on 16 Jun 2014
Bien Javier
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3 Comments
fert
on 22 Feb 2014
y = sum(x)
x=[1 2 3 5]
is not that true, i am confused.
Thomas Blackwood
on 5 Sep 2016
You haven't stated the *Function* name, input values and output values. Without them the code from the site cannot check your code.
Secondly you've declared X after you wanted to run a function with it.
The program will read:
Sum of X equals Y. X equals Zero or Not a Number, therefore Y is Zero or Not a Number. Next line, X is [Array]. Okay, X is [Array].
Also good practice to end your functions with a semicolon ;
;)
Thomas Blackwood
on 5 Sep 2016
You haven't stated the *Function* name, input values and output values. Without them the code from the site cannot check your code. Secondly you've declared X after you wanted to run a function with it. The program will read: Sum of X equals Y. X equals Zero or Not a Number, therefore Y is Zero or Not a Number. Next line, X is [Array]. Okay, X is [Array]. Y is still 0 or NaN. Also good practice to end your functions with a semicolon ;
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1 Comment
Andrew Newell
on 7 Jun 2013
This solution is just for a laugh - the test suite is pretty weak!
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3 Comments
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3 Comments
HaveF
on 17 Dec 2012
although ans trick can make the code short... but I don't like it...
Lajos
on 10 May 2014
I agree with HaveF.
Barry Becker
on 21 Nov 2015
Not to mention that it doesn't even run
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1 Comment
greatordinary
on 3 Mar 2012
there is definitely something wrong with cody.I am getting 'Undefined function 'cody.verifyCode' for input arguments of type 'char'.' for my solution
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1 Comment
Jeff
on 1 Feb 2012
Why isn't nansum(x) a solution?
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2 Comments
TAB
on 23 Jun 2012
Test for vactor
x = [1 4;3 4]
It will add columns only.
Ozan Gunaydin
on 22 Sep 2014
Problem is finding the sum of all numbers in an input vector, so the test set is correct.
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