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(gnuplot.info)Unary

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 The following is a list of all the unary operators and their usages:

     Symbol      Example    Explanation
       -           -a          unary minus
       +           +a          unary plus (no-operation)
       ~           ~a        * one's complement
       !           !a        * logical negation
       !           a!        * factorial
       $           $3        * call arg/column during `using` (Note: using )
 manipulation (*) Starred explanations indicate that the operator requires an
 integer argument.

 Operator precedence is the same as in Fortran and C.  As in those languages,
 parentheses may be used to change the order of operation.  Thus -2**2 = -4,
 but (-2)**2 = 4.

 The factorial operator returns a real number to allow a greater range.