Operations on signals

An operator is applied to a signal value one element at a time. For example, the operator ~ stands for logical ``not''. Thus if

         foo =  0;1;0;1;...

then

        ~foo =  1;0;1;0;...

That is, it is the result of applying logical ``not'' to each element of the sequence. Similarly, & stands for logical ``and''. Thus, if

                 foo = 0;1;0;1;...
and              bar = 0;0;1;1;...

then

           foo & bar = 0;0;0;1;...