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

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Raldi il 31 Ott 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?
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the cyclist il 31 Ott 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 il 31 Ott 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.

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### Risposta accettata

Honglei Chen il 31 Ott 2012
you can use conv2 or imfilter, for example
x = magic(3)
y = conv2(ones(3)/9,x)
##### 5 CommentiMostra 3 commenti meno recentiNascondi 3 commenti meno recenti
Matt J il 31 Ott 2012
Yes, that's what I really meant.
Raldi il 31 Ott 2012
Thanks alot guys.

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