How to get all values existing in arrays/matrices?
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Arif Widianto
le 24 Mar 2020
Modifié(e) : Andrei Bobrov
le 24 Mar 2020
Hello,
Let say I have a 3-by-2 array with random integer values. For example,
myArray = [98 56; 58 52; 100 56];
What I want to do is, I want to get all value in the array and its frequency and save it to another array like this,
listValue = [98 1; 56 2; 58 1; 52 1; 100 1];
Is there any function or a way to do it?
Thank you in advance.
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Andrei Bobrov
le 24 Mar 2020
Modifié(e) : Andrei Bobrov
le 24 Mar 2020
[a,~,c] = unique(reshape(myArray',[],1),'stable');
out = [a, accumarray(c,1)];
or
out = varfun(@(x)x,array2table(myArray(:)),'GroupingVariables',1);
2 commentaires
Andrei Bobrov
le 24 Mar 2020
Modifié(e) : Andrei Bobrov
le 24 Mar 2020
Yes or:
[a,~,c] = unique(myArray);
out = [a, accumarray(c,1)];
Plus de réponses (2)
Walter Roberson
le 24 Mar 2020
See unique() and accumarray. Or unique and histc or histcounts (but be careful about the last value in histcounts). Or use a loop. Or use sparse(). Lots of ways.
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