Advanced Matrices addition help

Im trying to figure out how I can create a function that will take a row vector, say 3-x-n, and figure out how to add each element of its immediate neighbor,find the average and replace create a new matrix.

so if A=[ 1 2 0 1]

[]=avg#(A)

ans= 1.5 1 1 .5

can you help

[Image Analyst]

Duplicate version of question at : http://www.mathworks.com/matlabcentral/answers/125396-matrix-addition-and-means

Answer 1

[John D'Errico]

(I'm not sure how a 3xn matrix is a row vector, by the way.)

Anyway, what have you tried? Surely this is trivial with a loop. If you really want to be efficient, then why not try conv? That is usually the trick to all of these problems. Take a shot at it.

[Joseph Pauwels]

es, sorry, should have reread my question a 3xn is not a row vector, I meant to say I want the function file to work for a row vector as well as a 3xn. Ill try conv.

Thank you, I dont think thats what I am looking for, I now I need a loop but Im not sure how to start. If i have a 2 x 2 like

a=[2 4 2 3]

the function needs to take (r1+(r1,c1)+(r2,c1)+(r2,c2)) the average them.

[Jan]

I do not understand, what "(r1+(r1,c1)+(r2,c1)+(r2,c2))" means.

[Image Analyst]

Joseph's "Answers" moved here since they're not answers to his original question, butt comments to John's answer:

yes, sorry, should have reread my question a 3xn is not a row vector, I meant to say I want the function file to work for a row vector as well as a 3xn. Ill try conv.

Thank you,

I dont think thats what I am looking for, I now I need a loop but Im not sure how to start. If i have a 2 x 2 like

a=[2 4 2 3]

the function needs to take (r1+(r1,c1)+(r2,c1)+(r2,c2)) the average them.

Answer 2

[Image Analyst]

I gave your answer in the duplicate question:

sum_Of_a = conv2(a, ones(3), 'same')
count_in_window = conv2(ones(size(a)), ones(3), 'same')
theMean = sum_Of_a ./ count_in_window % Same as "output"

[Joseph Pauwels]

can you please delete this question and anwser thread.