Problem 2234. Find and replace the zero array in a matrix

Created by Essi

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Find the zero array in the matrix and replace it with average of surrounding (adjacent) arrays.
Example:
A =
     3     5     7    90     1
     5     1    -1     0     2
     1     2     3     4    70
    23     1     2     3     5
Output is:
B=23.75;

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Last Solution submitted on Dec 02, 2025

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J.R.! Menzinger on 4 Mar 2014

I think you want to write A and not x:
assert(isequal(adjacent_averaging(A),B))

Swapnali Gujar on 4 Mar 2014

test case #2 and 3 should be corrected. Instead of x, it should be A

Jon on 4 Mar 2014

What elements do you consider the "surrounding arrays"?

J-G van der Toorn on 4 Mar 2014

Surrounding arrays apparently are the elements right above, below, left, and right the zero elements. Found out by reverse engineering. The x is still a mystery.

Jean-Marie Sainthillier on 8 Mar 2014

More tests please. A lot of solutions assume that 0 can't be in the first (or last) column.

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Problem 2234. Find and replace the zero array in a matrix

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Problem 2234. Find and replace the zero array in a matrix

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