How can I compare the user input value in a given matrix.

b=[ 10 32 54 76 -25
20 60 100 140 -51
45  135  -135 -45 59]
b1=input(' b1= '); 
 b2=input('b2= ');
 b3=input('b3= '); 
 b4=input('b4= ');
if (b1==b(1)||b(6)||b(11))&&(b2==b(2)||b(7)||b(12))&&(b3==b(3)||b(8)||b(13))&&(b4==b(4)||b(9)||b(14))
   disp('MATCH FOUND');
else 
    disp('MATCH NOT FOUND');
end

[jgg]

I'm pretty sure your issue is that your or conditions are not written properly. Write them as full conditions.

Answer 1

[Walter Roberson]

MATLAB does not have transitive "==" operators. (I don't know of any programming languages which do.) The section of code

(b1==b(1)||b(6)||b(11))

does not mean "(b1 is equal to b(1)), or (b1 is equal to b(6)), or (b1 is equal to b(11))". Each of the sections between the "||" is evaluated separately, so instead it means "(b1 is equal to b(1)), or (b(6) is true), or (b(11) is true)" and in MATLAB, a value is true if it is not 0. (Except that testing NaN in that syntax generates an error.)

If you want to test b1 against those three values, you need to write the "==" tests out,

b1 == b(1) || b1 == b(6) || b1 == b(11)

or you can use

ismember(b1, [b(1), b(6), b(11)])

or more compactly

ismember(b1, b([1 6 11]))

[Smita Banerjee]

Thank you Sir, I have used

B=[b1 b2 b3 b4]
isequal (b(1,1:4),B)||isequal (b(2,1:4),B)||isequal (b(3,1:4),B)

[Walter Roberson]

Ummm, maybe. You did not really define what you wanted to test for, so I cannot tell whether that is correct or not. If that code is accurate it looks to me like it could be done as

B=[b1 b2 b3 b4];
ismember(B, b(:,1:4), 'rows')