How to compute the Median Absolute deviation of all values of a matrix on Matlab R2015b

Question

Mehdi Kooli 2022-10-14

评论： Mehdi Kooli 2022-10-18

I have a matrix, for exemple :

X = reshape(1:20,[4 5])

and I want to compute the MAD of all the values of this matrix on Matlab R2015b.

I tried to compute it with the online Matlab exemple tester using the command mad_X = mad(X,1,'all') and it gives the result : mad_X= 4

This option 'all' doesn't exist on Matlab R2015b so how can I compute it in this version, I tried the simple command the simple command

mad_X = mad(X,1) but the result isn't a value it's a vector mad_X = 1 1 1 1 1

Any suggestion please

Answer 1

Branden Summa 2022-10-14

You could use X(:) to return the elements in column order, and then use mad on that new vector

X= reshape(1:20,[4 5]);
mad(X(:),1)
ans = 5
mad(X,1,'all')
ans = 5

Mehdi Kooli 2022-10-18

Thanks for the response @Branden Summa, that's what I was looking for.