Total number of zeros , ones , twos..etc in a matrix

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Joydeb Saha
Joydeb Saha el 9 de Dic. de 2020
Comentada: Joydeb Saha el 9 de Dic. de 2020
I have a matrix where in the fourth column there will be numbers of 0 to 23. I need a separate matrix where there will be the total numbers of 0s, 1s,2s ..23s etc. Say there will be 1000 0s, 3000 1s 24000 11s etc.
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Elimelech Schreiber
Elimelech Schreiber el 9 de Dic. de 2020
histcounts()
https://www.mathworks.com/help/matlab/ref/histcounts.html
specifically for your problem:
histcounts(x(:,4), (-1:max(x(:,4)))+0.5)
Walter Roberson
Walter Roberson el 9 de Dic. de 2020
Editada: Walter Roberson el 9 de Dic. de 2020
accumarray() together with findgroups(). Or use groupcounts()
I will not post code as I have a suspicion this is homework.

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KSSV
KSSV el 9 de Dic. de 2020
Let a be your data array.
[count_unique, unique_a] = hist(a,unique(a)) ;

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