mean value of each row
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ava
il 5 Feb 2012
Commentato: Walter Roberson
il 2 Set 2021
I have A 500 by 16 matrix and I want to find a mean value of each row and return the result as a 500 by 1.
Does anyone have an idea?
Thank you
2 Commenti
Walter Fanka
il 15 Lug 2018
Modificato: Walter Roberson
il 17 Lug 2018
y = yourmatrix;
meanrow_y = mean(y')'
Walter Roberson
il 17 Lug 2018
That should work for 2D arrays like were asked about. However for 3 or more dimensions it would not work and you would need to use a couple of permute() instead. It is a lot easier to just pass in the dimension number like I showed in my Answer.
Risposta accettata
Walter Roberson
il 5 Feb 2012
mean(YourMatrix,2)
4 Commenti
Jan
il 15 Mar 2017
The documentation of mean explains this exhaustively already:
doc mean
The first input is the data, the 2nd the dimension to operate on. Therefore mean(x,2) is the mean over the 2nd dimension, which means the rows.
Amy Gleckl
il 20 Dic 2019
I had a similar issue and this worked perfectly for me, thank you very much!
Più risposte (2)
sura Naji
il 25 Ott 2019
l have amatrix contact from 1 colum and 1000 rows l want to find the mean and the standard deviation also l want to find the worst value of this because l use the particle swarm optimization
1 Commento
Walter Roberson
il 22 Dic 2019
M = mean(amatrix);
S = std(amatrix);
[~, order] = max(abs(amatrix - M));
furthest_from_mean = amatrix(order(1));
Note that the value that is furthest from the mean will also be the value that is the greatest zscore (furthest deviation)
RAMPUNIT KUMAR
il 2 Set 2021
RAMPUNIT KUMAR less than a minute ago ⋮ I too have a doubt, like for matrix (a b c d e f g h I j k l m n o p q r) I need to find the mean of a,b then c,d then e,f then g,h and so on upto last element. How could we do that if size is big enough.
1 Commento
Walter Roberson
il 2 Set 2021
syms a b c d e f g h I j k l m n o p q r
matrix = [a b c d e f g h I j k l m n o p q r]
means = (matrix(1:2:end) + matrix(2:2:end))/2
except that you would use the appropriate numeric values in matrix instead of syms . The syms used here is just for demonstration purposes.
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