count how many times the element occur in a list
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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?
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Akzeptierte Antwort
Walter Roberson
am 13 Mär. 2013
[maxcount, maxidx] = max(answer(:,2));
answer(maxidx,1), 'occurred', maxcount
Weitere Antworten (1)
Image Analyst
am 13 Mär. 2013
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 Kommentare
Image Analyst
am 14 Mär. 2013
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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