MATLAB: Finding the common numbers in 2 arrays

arrays

I want to compare two arrays each containing 6 numbers e.g. [1,2,3,4,5,6] and [4,8,6,10,11,12]. I want to determine how many numbers are common to both arrays (not necessarily in the same location) so the above would yield an answer of 2 as 4 and 6 are common to both. Thanks!

Best Answer

See:

doc ismember

With code:

   a = [1,2,3,4,5,6]
   b = [4,8,6,10,11,12]
  nCommon = sum(ismember(a, b))

Maybe the inputs are not unique, then apply unique() at first.

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MATLAB: Find missing element between two matrix

>> A = [1,2;3,6;3,5;1,4;4,6;2,7;1,6;6,5;2,3;6,7;3,4];
>> B = [1,2;1,6;2,3;3,4;4,6];
>> R = setdiff(A,B,'rows')
R =
   1   4
   2   7
   3   5
   3   6
   6   5
   6   7

To get the same order, use the 'stable' option or this:

>> [~,X] = setdiff(A,B,'rows');
>> X = sort(X);
>> R = A(X,:)
R =
   3   6
   3   5
   1   4
   2   7
   6   5
   6   7

MATLAB: Common colorbar

Hard to say without seeing the code, but it looks like there's some condition that makes it possible for layoutColorbar to complete without newpos ever being defined -- that's the initial warning, which then leads to the error on line 125 of f_colorbar. Presumably it's a subtle bug in the logic which hasn't manifested until now.

With the Editor, you can highlight a variable and see where it shows up in that file. Maybe you can use that to trace the creation of newpos and see if there's anything that could prevent it. You could also simply try putting a breakpoint in layoutColorbar and stepping through (when running an example you know is failing).

Best Answer

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MATLAB: Find missing element between two matrix

MATLAB: Common colorbar

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