How to get all values existing in arrays/matrices?

50 Ansichten (letzte 30 Tage)
Arif Widianto
Arif Widianto am 24 Mär. 2020
Bearbeitet: Andrei Bobrov am 24 Mär. 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.

Akzeptierte Antwort

Andrei Bobrov
Andrei Bobrov am 24 Mär. 2020
Bearbeitet: Andrei Bobrov am 24 Mär. 2020
[a,~,c] = unique(reshape(myArray',[],1),'stable');
out = [a, accumarray(c,1)];
or
out = varfun(@(x)x,array2table(myArray(:)),'GroupingVariables',1);
  2 Kommentare
Arif Widianto
Arif Widianto am 24 Mär. 2020
Bearbeitet: Arif Widianto am 24 Mär. 2020
The first one works for my case. So, if I want it sorted, the only thing I need to do is changing 'stable' to 'sorted' right?
Andrei Bobrov
Andrei Bobrov am 24 Mär. 2020
Bearbeitet: Andrei Bobrov am 24 Mär. 2020
Yes or:
[a,~,c] = unique(myArray);
out = [a, accumarray(c,1)];

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (2)

KSSV
KSSV am 24 Mär. 2020
Bearbeitet: KSSV am 24 Mär. 2020
Read about unique
a = myArray(:) ;
[cnt_unique, unique_a] = hist(a,unique(a)) ;

Walter Roberson
Walter Roberson am 24 Mär. 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.

Kategorien

Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange

Tags

Community Treasure Hunt

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

Start Hunting!

Translated by