# Compute average of each value in a matrix without using for

2 views (last 30 days)
Raldi on 31 Oct 2012
Hi all,
I was wondering is it possible to alter each value of a matrix based on the average value of its neighbors, wihtout using for loops?
the cyclist on 31 Oct 2012
It would eliminate a lot of guesswork on the part of people trying to help you if you could be much more specific about what you want to do, and ideally provide at least one example of the input and output you would expect from this.
Raldi on 31 Oct 2012
You are right...
Well basicaly lets say i have
x= [0 0 0 0 0 0 0 2 0 0 0 0 0 1 0 0 0 0 0 0]
What i want is to create a new matrix that will be
newx= [0 0 (2/9) 0 0 0 0 2 0 0 0 0 (3/9) 1 0 0 0 0 0 0]
Here i randomly changed only two values to show that the get the average value of all the neighboring values.

Honglei Chen on 31 Oct 2012
you can use conv2 or imfilter, for example
x = magic(3)
y = conv2(ones(3)/9,x)
Matt J on 31 Oct 2012
Yes, that's what I really meant.
Raldi on 31 Oct 2012
Thanks alot guys.

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