count how many times the element occur in a list

1 次查看（过去 30 天）
pammy
pammy 2013-3-13
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?

请先登录，再回答此问题。

采纳的回答

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

更多回答（1 个）

Image Analyst
Image Analyst 2013-3-13
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.
  2 个评论
pammy
pammy 2013-3-14
编辑：pammy 2013-3-14
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 2013-3-14
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

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Arithmetic 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by