i want to compare between 3 matrices

I have an equation that i have 3 matrices

i should compare to each other with an if statment

I1 and I2 are matrices

plus what if i want to compare I1 == I2 == I3

if true i would print something

if I1 == I2 
    disp('I1 = I2')
end

Answer 1

[Alex Mcaulley]

Use isequal:

if isequal(I1,I2,I3)
    disp('I1 == I2 == I3')
end

[Hassan Bosha]

I don't why it's not working although they equal each other

P1 = [ 1  2  3 ];
RPY1 = [ 30 20 10];
AtoB_1 = transl([P1])*rpy2tr([RPY1]); 
BtoA_1 = inv(AtoB_1);
 
I1 = AtoB_1 * BtoA_1
I2 = BtoA_1 * AtoB_1
I3 = eye(4)

if isequal(I1,I2,I3)
    disp('I1 == I2 == I3')
end

[Hassan Bosha]

I solved it by rounding matrix I1 and I2