# bin2gary: Conversion to char from logical is not possible

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ali ayat on 16 Jan 2022
Commented: ali ayat on 17 Jan 2022
hello
i need to convert binary to gary. i did my search and i found this:
function g = bi2gray( b )
g(:,1) = b(:,1);
for i = 2:size(b,2)
g(:,i) = xor( b(:,i-1), b(:,i) );
end
return;
but when i give it a binary number like this:
x=10;
x1=dec2bin(x);
bi2gray(x1)
this error is occured:
Conversion to char from logical is not possible.
Error in bi2gray (line 15)
g(:,i) = xor( b(:,i-1), b(:,i) );

DGM on 16 Jan 2022
Edited: DGM on 16 Jan 2022
The output of dec2bin() is a character array. If you want to do logical operations on it, you have to convert it first.
x = 10;
x1 = dec2bin(x); % this is a char vector
x1 = x1 == '1'; % this is a logical vector
output = bi2gray(x1)
output = 1×4 logical array
1 1 1 1
That said, I'm not sure how this is supposed to convert binary to gray. Is the output supposed to be the same as the input (decimal 10)? If so, why not just do:
x = 10;
x1 = dec2bin(x); % this is a char vector
output = bin2dec(x1)
output = 10
Bear in mind that if you're doing this with images, the output is now improperly-scaled for its class (double), and so it won't be handled correctly by imshow() or imwrite() until it is rescaled or recast appropriately.
function g = bi2gray( b )
g(:,1) = b(:,1);
for i = 2:size(b,2)
g(:,i) = xor( b(:,i-1), b(:,i) );
end
end
ali ayat on 17 Jan 2022
Yeah! i keep searching and i found "binaryVectorToDecimal()". & thanks to your hint about conversion of char to logical array and then converting binary vector to decimal, the problem solved!

R2021b

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