compare two matrices

Hi,

I want to compare two matrices for equal values, and I want to know if there is a build-in function to do this. Ihaven't been able to find it in the MATLAB help.

example: A=[1 2 3; 4 5 6; 7 8 9] B=[9 8 7; 6 5 4; 3 2 1] this should return something like result=[0 0 0;0 1 0;0 0 0] so I can see there is an equal number on the same position in both matrices and the position that it is in.

Thanks!

Ellen

[João Peixoto]

have you tried? result = A==B;

[SALAR SHAIKHAH]

You can do as: C=A==B, The matrix C will contain the result of comparison... For more comparison, you can see following link: https://www.mathworks.com/help/matlab/matlab_prog/array-comparison-with-relational-operators.html

Answer 1

[Sean de Wolski]

result = A==B;

[Ellen]

Thanks so much.

Sometimes the answer is so simple, you don't think about it

[Sincloe Brans]

This doesn't work for two matrix with different dimensions, any way to compare two matrix with different rows and same number of column (eg A=50*16 vs B=100*16)?

[Sean de Wolski]

isequal

Sincloe, please ask this as a new question next time!

Answer 2

[Shubham Patel]

Use this

isequal(A,B)

[AMAN GAUTAM]

Sir,Why its result is "Non orthogonal".While all element of inverse matrix R1 and R_UTOF is same, Please tell mistakes-

angle=input('Enter euler angle in order');

alpha=(pi/180).*angle(1,1);

beta=(pi/180).*angle(1,1);

gama=(pi/180).*angle(1,1);

R_z_alpha=[cos(alpha) -sin(alpha) 0;sin(alpha) cos(alpha) 0;0 0 1];

R_y_beta=[cos(beta) 0 -sin(beta);0 1 0;sin(beta) 0 cos(beta)];

R_x_gama=[1 0 0;0 cos(gama) -sin(gama);0 sin(gama) cos(gama)];

disp('Rotation matrix is ');

R_UTOF=R_z_alpha*R_y_beta*R_x_gama; % rotation converson matrix from Universal to final frame

disp(R_UTOF);

disp('Transpose of rotation matrix is');

disp(R_UTOF');

disp('Inverse of rotation matrix is');

R1=inv(R_UTOF);

disp(R1);

if isequal(R1,R_UTOF')

disp("Rotation matrix is Orthogonal");

else

disp("Rotation matrix is non Orthogonal");

end

Answer 3

[Kiarash Ahi]

How if I want two compare the two matrices and get only one digit; I mean 1 if both were the same and 0 if at least two element of the matrices differ?

[Kiarash Ahi]

I have just found the answer to my question:

 find(A~=B)

[Niko]

isequal(A,B)

[Salah Alhaithemy]

isempty(find(A==B))

Answer 4

[kevin harianto]

Is there documentation to check whether a matric is greater than in terms of size for each of the dimensions?

Answer 5

[Mirza Riyasat Ali]