Xor in SciLab

[Manoel Campos da Silva Filho]

Hi people. I'm newbie in MatLab and SciLab and I like to know if
exists a exclusive or logical operator in SciLab.
I search in the SciLab manual but I don't found anything. In C
language, the xor operator is ^, but in SciLab, this is
the power operator.

Thanks.

[philippe]

Hi manoel,

Manoel Campos da Silva Filho a écrit :

> Hi people. I'm newbie in MatLab and SciLab and I like to know if
> exists a exclusive or logical operator in SciLab.

from a mathematical point of view :

"xor" = "booleans are not equal" = "<>"

we can easily verify this :

-->%t<>%f
ans =

T

-->%t<>%t
ans =

F

-->%f<>%f
ans =

F

-->%f<>%t
ans =

T

Philippe

[skouo...@free.fr]

Hi, every body

You should go on the web site of Wikipedia, especially on Wikibooks or
http://fr.wikiwix.com/index.php?lang=en&disp=book or the Scilab own
site.

Wikibooks is fine because, every operator and function are explained.

Good luck!

Sam

[Moti Litochevski]

On Mar 27, 5:12 pm, Manoel Campos da Silva Filho

Hi,
This is a small implementation I found somewhere on the web. I
converted the code to Scilab and left all remarks as they are.
Good luck with your learning,
Moti

function y = bitxor(x1, x2)
//BITXOR Bitwise logical XOR operator.
//
// y = bitxor(x1,x2)
// Return the bitwise XOR of x1 and x2. This is the value that has 1
bits
// at positions where x1 and x2, but not both, have 1 bits. Does not
work
// when one of the numbers is negative.
//
// Note that this routine will work only up to 32 bits, or to the
precision
// of your machine's double-precision float representation, whichever
// is smaller.
//
// See also bitand, bitor, any, all, |, &, xor.

// Dave Mellinger
// 27 May 1995

// using a global is slightly faster than recomputing bit_vals every
time (Sun),
// but unfortunately in MATLAB 5.0 you can't tell if globals already
exist.
bit_vals = 2 .^ (0:31);

x1 = pmodulo(floor(x1 ./ bit_vals), 2);
x2 = pmodulo(floor(x2 ./ bit_vals), 2);

y = sum(bit_vals .* pmodulo(x1 + x2, 2));

endfunction