how to make ismember return a logical array

Hi there

commonxvalues=ismember(xpoint,points);
  commonyvalues=ismember(ypoint,points);
  if ismember(commonxvalues,1)==0
      points(counter,1)= xpoint;
  end
  if ismember(commonyvalues,1)==0
      points(counter,2)= ypoint;
  end

how do I make it so that common values returns a logical array. Otherwise, is there another function on matlab that will return a logical value if two elements in an array are the same, or a function that will return a logical value if ismember returns any positive output, because currently ismember returns a logical output in a 2d array. Cheers

[Guillaume]

Your question is not clear. ismember always return a logical array (as its first output), never anything else.

It would be better if you explained clearly what you're trying to achieve. That very odd construct

if ismember(commonxvalues, 1) == 0

could be written more clearly as

if ~commonxvalues

However, note that if commonxvalues is a vector or matrix, then it would be better off written as

if ~any(commonxvalues)

instead of using the often misunderstood behaviour of if when passed an array.