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how to fine repeated value?

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rajesh kumar
rajesh kumar 2020-3-21
关闭： MATLAB Answer Bot 2021-8-20
in a column if there is 100 vlaues some are repeated and nonrepeated values how to fine repeated values, how many times it is repeated .
how to get this is there any matlab instruction r code?

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回答（1 个）

Rik
Rik 2020-3-21
If you just wanted to know the repeated values you could use unique to filter each first occurrence, which would leave the repeated values.
As you want to know how often every value occurs the most logical step would be to histcounts. Use max and min to determine the bin edges.
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rajesh kumar
rajesh kumar 2020-3-21
x = randn(100,1);
y = randn(100,1);
[N,Xedges,Yedges] = histcounts2(x,y)
N =
0 0 0 2 0 0
1 2 10 4 0 0
1 4 9 9 5 0
1 4 10 11 5 1
1 4 6 3 1 1
0 0 1 2 0 0
0 0 1 0 1 0
Xedges =
-3 -2 -1 0 1 2 3 4
Yedges =
-3 -2 -1 0 1 2 3
i am not understanding this one, what is edges, bins, what is N how this obtains what is represents i am not understanding
Walter Roberson
Walter Roberson 2020-3-21
This does not appear to relate to the original question: the probability of a repeated value created by randn() is very low -- you would have to generate more than 1e8 samples for the probability of even one duplicate to reach 50%.

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