find the reptition in vector

Question

yousef Yousef 2014-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/124704-find-the-reptition-in-vector

评论： Jan 2014-4-6

HI,I have x=[2 4 4 1 1],I want if the number is not repeated like 2 to execute a condition.If repeated ,to execute another condition.

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Image Analyst 2014-4-6

编辑：Image Analyst 2014-4-6

So, for this x, are you going to execute the operation 1 or 2, or not? You have both unique and repeated numbers in this array, so which "condition" or operation are you going to execute????

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Answer 1

yousef Yousef 2014-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/124704-find-the-reptition-in-vector#answer_132448

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Its OK.Thanks. if you are still interested:

       2    82    10    16    15    66    76    71    83    44    49
       4    91    28    98    43     4    75     4    70    39    45
       4    13    55    96    92    85    40    28    32    77    65
       1    92    96    49    80    94    66     5    96    80    71
       1    64    97    81    96    68    18    10     4    19    76

I want the prog. to check each element of the first column.if it is not repeted,then take the first k large numbers of the row along with their indices and put them in matrix. if not take the first large k numbers and give them to the first repeat then give the rest to the next one. I think the condition must include sort command

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Image Analyst 2014-4-6

编辑：Image Analyst 2014-4-6

No, it means he's going to abandon this conversation and start a duplicate one, which he's already done. Grrrrr.

Jan 2014-4-6

While I still do not understand the original question, I have the faint impression, that "Grrrr" is a special kind of "the problem is solved".

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Answer 2

Image Analyst 2014-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/124704-find-the-reptition-in-vector#answer_132445

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Is this what you want:

x=[2 4 4 1 1]
ux = unique(x)
counts = histc(x, ux) % Histogram
for k = 1 : length(ux)
  checkValue = ux(k);
  if counts(k) == 1
    fprintf('Execute operation 1 because %d is unique.\n', checkValue);
  else
    fprintf('Execute operation 2 because %d is repeated.\n', checkValue);
  end
end

In the command window:

x =
     2     4     4     1     1
ux =
     1     2     4
counts =
     2     1     2
Execute operation 2 because 1 is repeated.
Execute operation 1 because 2 is unique.
Execute operation 2 because 4 is repeated.