There is a matrix (4*4) m as below one:


I do not write all of elements. The r[i,j] is created by a table and after a calculation its elements have appeared in the m. But in any elements of m, I want to see the difference between j and i. For example 256-1=255 for the first step. It must be repeated to all others which are adding to that. If for a special r, j-i is not equal to the others, I can see that r. I mean If I have


I must be notified that r[10,267] is wrong. Because it must be r[10,265].

Since There are many elements contribute to m I am not able to do that by hand. How can I gain this goal?


Let's make some fake data to play with:

data = Table[r[n + m, 255 + n + m], {n, 1, 20}, {m, {0, 10}}];

Then let's introduce an error:

data = data /. r[3, 258] -> r[3, 1000];

We can then conditionally format the r items that do not correspond to your rule:

data /. r[i_, j_] /; i + 255 != j :> Style[r[i, j], Red, Bold, Background -> Yellow]

Mathematica graphics

As you can see, the offending item is visually highlighted in the output.

  • $\begingroup$ I am grateful to receive again one of your perfects answers as before. $\endgroup$ Jun 8 '17 at 10:10
  • $\begingroup$ @Irreversible that's very kind, you are welcome! $\endgroup$
    – MarcoB
    Jun 8 '17 at 13:36

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