not

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$\includegraphics[height=10mm]{images/not}% WIDTH=48 HEIGHT=45$

The output is 1 or 0, depending on whether $$x\le0.5$% WIDTH=103 HEIGHT=27$ is true (1) or false (0) respectively.

The operator can be placed on the canvas in two ways:

From the Functions (``function'') toolbar; or
By typing the letters ``not_'' (the word not, followed by an underscore) on the canvas and then pressing the Enter key. The underscore is needed because ``not'' is a reserved word in C++, the programming language in which Ravel is written.