MATLAB: How to compare to matrices with each other

differential equationsif statementmatricessearch

Hi Everyone,

I have two different matrices with diffrent sizes. for example one of them is 1000*3 and the other one is 5000*3.

How can I select/compare the line (I mean 1000 rows of these 5000 rows will be the same in these two matrices) and keep it in another matrice?

box1=cut2d(:,2:4);

box2=rombohedral(:,1:3);

if box1==box2

rombohedral2d=rombohedral;

end

The if part is not working.

Best Answer

box1=cut2d(:,2:4);
box2=rombohedral(:,1:3);
[index1,index2] = ismember(box1,box2,'rows');
% index2 holds the indices of the rows that are also in box1
rombohedral2d=rombohedral(index2,:); % I assume you want all the columns, not only 3, right?
% if you want only those 3 columns, use:
% rombohedral2d=rombohedral(index2,1:3);

Related Solutions

MATLAB: How to find the start and end points of overlapping intervals in one array

a = [ 1.5000 95.5000; 82.5000 150.5000; 141.5000 197.5000; 191.5000 357.5000; 400.5000 438.5000; 415.5000 481.5000; 519.5000 667.5000];
b =  reshape(a',1,[]);
ii = strfind(sign(diff(b)),[-1 1]);
out = b;
out([ii,ii+1]) = [];

add

b =  reshape(a',1,[]);
x = all(tril(bsxfun(@lt,b(:),b(:)'))==0,2);
i0 = strfind(x(:)',[1 0]);
x(i0) = false;
out = b(x);

add2

a = [ 4.5000   58.5000
    4.5000   58.5000
   65.5000  118.5000
   65.5000  118.5000
  140.5000  277.5000
  140.5000  277.5000
  206.5000  223.5000
  206.5000  223.5000
  284.5000  295.5000
  284.5000  295.5000
  360.5000  422.5000
  360.5000  422.5000
  449.5000  454.5000
  449.5000  454.5000
  449.5000  532.5000
  449.5000  532.5000
  532.5000  574.5000
  532.5000  574.5000]
a1 = unique(a,'rows');
out = a1(1,:);
for jj = 2:size(a1,1)
    if out(end,2) > a1(jj,1) && a1(jj,2) > out(end,2)
        out(end,:) = [out(end,1) a1(jj,2)];
    elseif out(end,2) <= a1(jj,1)
        out(end + 1,:) = a1(jj,:);
    end
end

a1 = unique(a,'rows');
for jj = 2:size(a1,1)
    if a1(jj-1,2) > a1(jj,1) && a1(jj,2) > a1(jj-1,2)
        a1(jj,1) = 0 ;
        a1(jj-1,2) = 0;
    elseif a1(jj-1,2) >= a1(jj,2)
        a1(jj,:) = 0;
    end
end
out = a1';
out = reshape(out(out>0),2,[])';

MATLAB: Making one matrices dimension same as other

[rows1 colm1]=size(h);
[rows2 colm2]=size(k);
% You can change the way depending on sizes of h and k
% Also which direction you want to pad zeros
k_revise=[k;zeros(rows1-rows2,colm1)];

5.1000 3.8000 1.9000 0.4000

6.4000 2.9000 4.3000 1.3000

4.3000 3.0000 1.1000 0.1000

5.4000 3.0000 4.5000 1.5000

0 0 0 0

There are more smart way to do the same, please follow padarray

Best Answer

Related Solutions

MATLAB: How to find the start and end points of overlapping intervals in one array

MATLAB: Making one matrices dimension same as other

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