Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if
x = [1 2 5 2 2 7 8 3 3 1 3 8 8 8]
then
y = [2 3]
Solution Stats
Problem Comments
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3 Comments
Ashan Peiris
on 14 Jun 2014
why 'tabulate' function does not work here. It gives an error saying undefined function.
http://www.mathworks.in/help/stats/tabulate.html
Christopher Creutzig
on 24 Jul 2014
Ashan, tabulate is in stats. Cody does not have Statistics Toolbox.
Luyu Wang
on 10 Jul 2018
the in-build function tabulate cannot used in here.
Solution Comments
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1 Comment
Oleksandr Denysenko
on 8 Nov 2018
чёрт побери, это гениально!
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1 Comment
xuesong Geng
on 3 Jan 2018
3 lines using sparse
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1 Comment
Matthew Jones
on 26 Apr 2017
When I run the following solution for Test Suite #1, I get a zero in my solution array. If I replace c(i) with c, I get back a 2 and 3 (no zero). What is going on that a zero shows up?
[count, val] = histcounts(categorical(vect))
val = cellfun(@str2double, val) % convert val from string to numerical
for i = 1:length(count)
if count(i) == 3
c(i) = val(i)
end
end
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1 Comment
Anthony Tracy
on 24 Jun 2016
Recursion is so expensive...
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1 Comment
Noé
on 10 Dec 2015
Sorry
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1 Comment
Meade
on 8 May 2015
Slower, but actually readable in 2 lines.
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1 Comment
Haojun Yu
on 2 Oct 2014
It works well on version R2013b. Has the cmd "unique" changed?
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2 Comments
Marcel
on 26 Nov 2013
unique returns a sorted array
Ryan Vande Water
on 27 Nov 2013
So it does! thank you! shaved 2 off my size. :^)
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2 Comments
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1 Comment
Vas
on 4 Dec 2012
test 1 answer should be [2 3 8];
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1 Comment
Ionut Barbu
on 9 Jul 2017
very creative solution
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1 Comment
Cris Luengo
on 14 Jul 2012
Sorry for gaming towards the test set... should use min(x) and max(x) instead of -3 and 11.
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1 Comment
Naveen Gowdayyanadoddi
on 10 Jul 2012
'tabulate' function is define for inputs of type 'double'...Please check.
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1 Comment
Cris Luengo
on 14 Jul 2012
I think HIST would be more correct here than HISTC, as HIST takes bin centres as an argument, rather than bin edges.
But this is a very clever solution. I'm using min:max as bin centres, quite a bit longer!
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2 Comments
Sergey Sviridenich
on 5 Jun 2012
used function tabulate for a solution, however I got the following error : Undefined function 'tabulate' for input arguments of type 'double'. On the other hand this works quite well at my desktop version, can anyone explain why it is so.
Ned Gulley
on 6 Jun 2012
Tabulate is in the Statistics Toolbox. http://www.mathworks.com/help/toolbox/stats/tabulate.html
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1 Comment
Jan
on 26 Feb 2012
When I run the 3rd test locally, the result is accepted. But inside Cody the check fails.
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2 Comments
Giuseppe Cardillo
on 16 Feb 2012
THIS SOLUTION IS CORRECT!!!!
Ned Gulley
on 22 Mar 2012
The crosstab function is in the Statistics Toolbox. Cody only supports the commands in the basic MATLAB Toolbox.
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2 Comments
Hans
on 14 Feb 2012
please check the first case in your test suite:
the correct output should be [2 3 8], since the 8 also appears exactly three times
Ahmad Alzahrani
on 8 Dec 2013
8 is 4 times, not three.
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