Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row that matches this criterion.
Example:
Input a = [ 1 2 0 0 0
0 0 5 0 0
2 7 0 0 0
0 6 9 3 3 ]
Output r is 4
Solution Stats
Problem Comments
-
9 Comments
Show
6 older comments
Rodolfo
on 12 Mar 2013
How am I wrong here?
"a = [ ...
1 0 0;
0 0 0;
0 0 0;
0 0 0;
0 2 3];
r_correct = 5;"
My code says 2, I think it's correct, what am I missing?
Tim
on 12 Mar 2013
It wants the number of the row with the most nonzeros.
Rodolfo
on 12 Mar 2013
Thank you Tim! I feel like a fool, but that'll teach me to read the requirements more carefully. Hopefully.
Gabor Levai
on 8 Sep 2016
Great Problem!
MEI HUEI LIM
on 5 Jan 2017
nice
DilRavsh
on 20 Aug 2017
Love this one
Be Matlabi
on 19 Feb 2018
Piece of cake
Gani
on 8 Feb 2019
nice
Alexander
on 12 Feb 2019
easy :) but nice
Solution Comments
-
1 Comment
Olivia Li
on 26 May 2019
so happy~
-
2 Comments
BAOHUA ZHANG
on 22 Oct 2018
there is a bug i the code
input a = [1 0 1 1 ; 9999 0 0 0]
output 2
BAOHUA ZHANG
on 22 Oct 2018
there is a bug in the code
input a = [1 0 1 1 ; 9999 0 0 0]
output 2
-
1 Comment
Ravi
on 30 Mar 2018
r = max(sum((a==0)'));
-
1 Comment
Dustin Jones
on 12 Jul 2017
Original solution I created by digging through documentation was x=a~=0; y=sum(x,2); [M,I]=max(y); r=max(y). Solution had a size of 31 so I compressed it into it's current version.
-
1 Comment
Jagdish Khatri
on 26 May 2017
in case number 3 and 4 total number of element is also less than your correct fullest row output
How does this thing is possible
-
1 Comment
Yoshimasa Nakatani
on 11 Jan 2017
I did it!
(^^;)
-
1 Comment
Dan Po
on 24 Oct 2016
this is a terrible solution, someone help.
-
1 Comment
Marilyn Elizabeth
on 21 Mar 2016
Could you tell me how you did it?
-
1 Comment
Nicholas Hortance
on 4 Jul 2015
Once again ive used a for loop only because it seems so much simpler. The more I do these I see how each person has a different approach to a problem which I think is very cool. Thanks for the problem!
-
1 Comment
Riazul Arefin
on 20 May 2015
test suite is not ok
-
2 Comments
SAMET YILDIZ
on 15 Jul 2014
what is the problem here ? it works on matlab and gives the correct row
Tim
on 24 Aug 2014
2 things: You forgot to set your output (so add a line r=ix, or change the r in the first line into ix.
and you changed the function name so it doesn't recognize it.
Your solution does work.
-
1 Comment
Wesley Allen
on 18 Mar 2014
Well done.
-
2 Comments
Karthik Raja Arumugam
on 12 Feb 2014
Is there any way to avoid this for loop??
Jörg
on 20 May 2014
Yes, a hint: compare with zeros matrix and count (sum) the nonzero elements in this logical matrix.
-
5 Comments
Show
2 older comments
Karthik Raja Arumugam
on 12 Feb 2014
Can you please tell how did you do this with the size of 10?
Christian
on 14 Mar 2014
Just again the regexp Cheat, I guess!
I can't believe, that this is still working... Why don't they ban all the Cheating possibilities?
It's completely unfair, to all other players!
grotman
on 19 Feb 2017
The regexp cheat kind of shadows the "normal" solutions.
zefeng chen
on 26 Jun 2017
can you show that '10'?
Todd
on 13 Dec 2017
I did not mean to like this, but the 'Unlike' button does not work!
-
1 Comment
Gregor Baiker
on 1 Sep 2013
looks very strange
-
2 Comments
Alex Feinman
on 13 Feb 2012
I can't believe I used a trick I learned from Javascript...
Swapnali Gujar
on 8 Aug 2013
I tried to optimize my solution as much possible as I could, still my code size was 45, any idea what would be there in the leading solution of this problem which has code size as 11 ? Which trick did you use?
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
Select web siteYou can also select a web site from the following list:
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)