## count how many times the element occur in a list

on 13 Mar 2013

### Walter Roberson (view profile)

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)
end
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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### Walter Roberson (view profile)

on 13 Mar 2013
```[maxcount, maxidx] = max(answer(:,2));
```

pammy

### pammy (view profile)

on 14 Mar 2013

thank u so much sir...

### Image Analyst (view profile)

on 13 Mar 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.
```

pammy

### pammy (view profile)

on 14 Mar 2013

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 (view profile)

on 14 Mar 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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