bin2gary: Conversion to char from logical is not possible

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) );

Answer 1

[DGM]

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]

thanks DGM, first part was usefull.

In fact when you keep first bit (left to right) and xor every bit in a binary number with next bit, this process gives you the Gray Code of that binary number. so, if you convert 10 to binary it gives you 1010, then Gray Code is 1111 and then decimal of Gray is 15. see the wiki

[DGM]

Oh Gray code. Yeah I thought you were trying to convert an image to a grayscale representation.

[ali ayat]

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!