Creating new vector that only has duplicates from original vector.

Z
Z
2015 5 7
1 个回答
更新时间：2017 1 24
1 次查看（30 天）

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I need help with a small part of my code.
r1=randi(6,1,5)
rollnumber=0;
if Y==0 && rollnumber<2
rollnumber=rollnumber+1;
uniquer1=unique(r1)
countOfr1=hist(r1,uniquer1)
indexToRepeatedValue = (countOfr1~=1)
repeatedValues=uniquer1(indexToRepeatedValue)
numberOfAppearancesOfRepeatedValues=countOfr1(indexToRepeatedValue);
r1repeated=repeatedValues
r1numberofrepeated=numberOfAppearancesOfRepeatedValues
r1repeated=repeatedValues %this gives me the value of the repeated numbers
r1numberofrepeated=numberOfAppearancesOfRepeatedValues %this gives me how many times each number is repeated
Both of these are useful but I need a new vector that just has the repeated values.
The problem is I cannot figure out how to create a new vector with just the repeated values.
Example
r1=randi(6,1,5)
r1=[1 1 4 5 5] %values of r1
r2=[1 1 5 5] %the new r2 vector I need
I have read through my book and searched online and I have not been able to figure this out.
Thank you.

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回答（1 个）

Thorsten
Thorsten 2015-5-7

0 个投票

[ur1 a b] = unique(r1);
r2 = r1(ismember(r1, ur1(find(histc(b, unique(b)) == 2))));

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Thorsten
Thorsten 2015-5-7
编辑：Thorsten 2015-5-7
I see. Please use
[ur1 a b] = unique(r1);
r2 = r1(ismember(r1, ur1(find(histc(b, unique(b)) > 1))));
And if you need it sorted, add
r2 = sort(r2);

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Z
Z
2015-5-7

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Rena Berman
Rena Berman
2017-1-24

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