Re: elementwise boolean operations

[Przemek Klosowski]

On 05/20/2010 01:49 PM, Judd Storrs wrote:

> I think&  and | will do what you want. There are functional forms too:
> and(), or(), xor(), etc. The functional forms can take multiple
> inputs.

Actually, I was just wondering about that. I wanted a truth table of
a complicated logical expression, and I wrote it by a nested for bit=0:1
loop; but there must be a better way. Given that the logical ops take
vector arguments, all I need is a concise way to create a N by 2^N 
vector with all bit combinations, i.e.

x=[0 1 0 1; 0 0 1 1]
x =

   0   1   0   1
   0   0   1   1

xor(x(1,:),x(2,:))
ans =

   0   1   1   0


For extra bonus, how do you create those bit strings in Gray encoding
that is useful for Karnaugh maps? i.e.

x=[0 1 1 0];
y=[0 0 1 1];