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setdiff with respect to column values

Asked by RDG on 21 Aug 2013

Suppose I have:

*A ={1 1 1
     1 1 3
     1 1 4
     1 1 1
     1 2 1
     1 2 3
     1 2 4};
B=1:6; %Lists the (complete) values for column 3 in A
  • I inserted a space in between row 4 and 5 for easier viewing.

How can I identify the missing values in column 3 (with respect to column 2)? The range of values of A(:,3) is given in B (From 1-6).

Output should be something similar to this:

C={1 1 2
   1 1 5
   1 1 6
   1 2 2
   1 2 5
   1 2 6};

2 Comments

Matt J on 21 Aug 2013

It is not obvious what you consider "missing values" or how you obtained C from A. In particular, the values in C(:,3) are completely different than A(:,3).

dpb on 21 Aug 2013

Indeed, a literal interpretation as I read it of OP's request would require a cell array and the missing values would look something like

    {2:6;
  [2 4:6;
  [2 3 5 6;
   ... etc., ...
  [1 3 5 6}
RDG

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