LOGIC

Passes the value T_VAL or F_VAL to the output, depending on COND:
.    IF (COND) OUT=T_VAL 
.    ELSE      OUT=F_VAL

Returns the logical OR of the inputs.
If A or B are true, OUT is true, else false.
True is any non-zero number, false is 0.
A  B  OUT
---------
0  0 | 0
0  1 | 1
1  0 | 1
1  1 | 1

Returns the logical XOR of the inputs.
If A and B are logically opposite, output is 1.
If A and B are logically equal, output is 0.
A  B  OUT
---------
0  0 | 0
0  1 | 1
1  0 | 1
1  1 | 0

Returns the logical AND of the inputs.
If A and B are true, OUT is true, else false.
True is any non-zero number, false is 0.
A  B  OUT
---------
0  0 | 0
0  1 | 0
1  0 | 0
1  1 | 1

Returns the logical NOT of the input.
If A is true, OUT is false. If A is false, out is true.
True is any non-zero number, false is 0.
A  OUT
------
0 | 1
1 | 0

If all components of A are even, 
this function returns 1, otherwise 0 is returned.

If all components of A are odd, 
this function returns 1, otherwise 0 is returned.

Does a string pattern on subject SUBJ.  Returns 1.0 if the pattern
exists anywhere within SUBJ, and 0.0 if the pattern does not exist
within SUBJ.  The pattern PAT can be any regular expression, as
described in the Unix manual page on regex(5), with the following
exception: the $n notation does not work, as there are no return
values from this function.  Note that the pattern does not need to
start in the first character of SUBJ, unless the pattern begins
with the ^ (beginning of string) character.

Returns the logical value for a test of equality.
If A == B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of in-equality.
If A != B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of A < B.
If A < B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of A <= B.
If A <= B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of A > B.
If A > B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of A >= B.
If A >= B, OUT is true, else false.
True is any non-zero number, false is 0.

Returns the logical value for a test of X > MAX or X < MIN.
True is any non-zero number, false is 0.