xor value always get zero

img=img('lena.bmp');
i=10;
j=10;
img(i,j)

the result is 158

after i xor with 255

xor(img(i,j),255)

the result is wrong... always get zero...

how to get correct xored value?

[the cyclist]

I don't think I would say that the result is wrong. I would say that the xor function doesn't do what you think it does.

Can you tell us what you need your function to actually do?

Answer 1

[Guillaume]

xor is a logical operator that either return 0 (if both inputs are 0 or both inputs are not 0) or 1 (if one of the input is 0 but not the other).

I strongly suspect that you're wanting to perform a binary xor which is achieved with bitxor:

>>bitxor(158, 255)
ans = 
   97

See the list of bit-wise operators

[the cyclist]

Upvote for you, my friend. I bet you're right, I was confident there was a function for it, and I wish I had known it. :-)