Someone can help with the matrix manipulation?

Hello everyone,

I have two matrix A and B and i wanna find the row equals in both matrix and remove the line on matrix B. I wanna safe on the vector the position the lines,How can i do it?

For example:

A = [1 2 6 3;
     4 5 6 9;
     7 7 7 6;
     9 8 7 3];
B = [0 9 6 3;
     3 5 1 9;
     7 7 7 6;
     9 8 9 9];

the row equals is row 3. So i wanna find the rows equal, that's row 3 and leave the matrix B this way:

B = [0 9 6 3;
     3 5 1 9;
     9 8 9 9];
vector = 3;

I tryed this way:

ix = all(A == B, 2);
B = B(~ix, :)
vector = find(ix)

but i can't use the function all, i can use only the functions: "find", "unique" and "isempty". I can use the function "for" and "size" too.

Ps.: If i put the two matrix with diffent dimensions, my code not working. Appear this error:

"Error using  == 
Matrix dimensions must agree."

Help me

[madhan ravi]

Does it mean it's your exam/homework?

"Ps.: If i put the two matrix with diffent dimensions, my code not working. Appear this error:"

Was not there another option in your previous question?? https://www.mathworks.com/matlabcentral/answers/539511-somone-can-help-me-with-unique-and-find-function

[Rodrigo Franco]

Yeahh.... Put the teacher wanna without the function all or ismember

Answer 1

[David Hill]

I assume you can use sum.

vector=[];
for k=1:size(A,1)
    for m=1:size(B,1)
        if sum(B(m,:)==A(k,:))==size(A,2)
            vector=[vector,m];
        end
    end
end
B(vector,:)=[];