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필터 지우기

count how many times the element occur in a list

조회 수: 2 (최근 30일)
pammy
pammy 2013년 3월 13일
like i have the following code for the above:
function count
clc;
a=[1 2 3 3 4 5 5 5 5 5 6 6 6 6];
u=unique(a);
for n=1:length(u)
answer(n,:)=[u(n) length(find(a==u(n)))];
end
disp(answer);
end
output is:
1 1
2 1
3 2
4 1
5 5
6 4
i want to find the maximum value from the list (1 1 2 1 5 4) i.e from the 2nd column of the output...
2nd column of output displays the number of times the given element occurs.
can anyone tell me how to solve it?

채택된 답변

Walter Roberson
Walter Roberson 2013년 3월 13일
[maxcount, maxidx] = max(answer(:,2));
answer(maxidx,1), 'occurred', maxcount

추가 답변 (1개)

Image Analyst
Image Analyst 2013년 3월 13일
That's just the histogram:
% Create sample data.
a=[1 2 3 3 4 5 5 5 5 5 6 6 6 6 9 9 11 11 18]
% Get the histogram with bins every 1 wide from 1 to the max value of a.
numberOfBins = max(a)-min(a)+1 % Assumes integer a values.
counts = hist(a, numberOfBins)
% Find out where the histogram is maximum.
[maxValue, maxIndex] = max(counts)
% Print out information to the command line.
fprintf('The most frequently occurring number is %d, which occurs %d times.\n',...
maxIndex, maxValue);
In the command window:
a =
1 2 3 3 4 5 5 5 5 5 6 6 6 6 9 9 11 11 18
numberOfBins =
18
counts =
1 1 2 1 5 4 0 0 2 0 2 0 0 0 0 0 0 1
maxValue =
5
maxIndex =
5
The most frequently occurring number is 5, which occurs 5 times.
  댓글 수: 2
pammy
pammy 2013년 3월 14일
편집: pammy 2013년 3월 14일
shows error in line 6
error using hist
Too many input arguments.
Error in hist (line 6)
counts = hist(a,numberOfBins)
Image Analyst
Image Analyst 2013년 3월 14일
You probably redefined hist to be a variable in your program, thus blowing away the built-in function. What do these say:
whos hist
which -all hist

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