How to determine array equality ?

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x y 2015-11-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/258261-how-to-determine-array-equality

评论： Guillaume 2015-11-30

hy I want to in main while cycle search for point with random searching 'robot'. If the robot see the point what is not in the list, then should put the coordinate to the list...if this point does not contain. I can't figure out how to comparate... I tried different way, the last what I did is this,but I need something like do in for loop,what is going through the matrix rows.

templist = [1  2  0
            2  2  0 
            45 5  0
            4  5  1
            7  85 0
            4  5  1]
 newcordinate = [ 4 5 ]
 LIST  = [];
%   sum( [zoznam(:,1) zoznam(:,2)]' ) 
  if sum(newcordinate') == sum( [templist(:,1) templist(:,2)]' ) 
                         display('do nothing')
                      else
                         templist(end+1)= newcordinate(1,2);  
                         templist(end+1)= newcordinate(1,1);
                         templist(end+1)= 0;
                         LIST  = reshape(templist,3,[])'
  end

the third element is need in the further to determine is the coordinate is used or not

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Answer 1

Guillaume 2015-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/258261-how-to-determine-array-equality#answer_201697

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Possibly, this is what you want:

templist = [1  2  0
            2  2  0 
            45 5  0
            4  5  1
            7  85 0
            4  5  1]
newcoordinate = [4 5]
if ismember(newcoordinate, templist(:, [1 2]), 'rows')
   display('do nothing');
else
   templist(end+1, :) = [newcoordinate, 0];
end