How to make matlab count
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Rainaire Hansford
am 11 Jun. 2019
Kommentiert: Rainaire Hansford
am 17 Jun. 2019
Hello Matlab community,
I wented to know is there a way to create a code to count how many times a number ouccers in a given matrix.
For example I would like to input:
x=input('Numeber')
=[1 2 3 4 5
1 2 3 5 6
7 2 4 3 5]
Is there a way for Matlab to count how many of each number has occured.
Please provide example Thank you so much.
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Akzeptierte Antwort
madhan ravi
am 11 Jun. 2019
Bearbeitet: madhan ravi
am 11 Jun. 2019
"Is there a way for Matlab to count how many of each number has occured."
The below gives the number of counts of each unique elements in the matrix:
x =[1 2 3 4 5
1 2 3 5 6
7 2 4 3 5]
[uv,~,idx] = unique(x);
n = accumarray(idx(:),1);
% or
n = histc(x(:),uv);
% or
n = sum(x(:).' == uv,2);
Result = [uv,n] % uv - unique elements in the matrix & n - number of times each unique elements appear
Gives:
Result =
1 2
2 3
3 3
4 2
5 3
6 1
7 1
>>
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Weitere Antworten (4)
Alex Mcaulley
am 11 Jun. 2019
A =[1 2 3 4 5
1 2 3 5 6
7 2 4 3 5];
x=input('Number')
sum(A(:) == x)
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Star Strider
am 11 Jun. 2019
x = 5
M=[1 2 3 4 5
1 2 3 5 6
7 2 4 3 5]
Count = nnz(M == x)
producing:
Count =
3
0 Kommentare
Steven Lord
am 11 Jun. 2019
If you want the frequency of one particular element from the matrix, use the techniques madhan ravi, Alex Mcaulley, and Star Strider have given.
If you want just the counts for each unique element, use histcounts.
If you want a picture of the frequency data, use histogram. The graphics object histogram returns also has the bin count information in its properties, but if you don't need the picture I would use histcounts and skip the cost (in time and memory) of creating the picture.
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