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[[A Programming Language]] negates arrays using an overbar symbol like <math>\overline{p}</math>, matching a convention sometimes used in mathematics. In [[APL\360]] the current symbol <syntaxhighlight lang=apl inline>~</syntaxhighlight> was chosen, also due to its use in mathematics. Mathematical usage has arguably diverged from APL in this respect, as the negation of a variable <math>p</math> is now more often written <math>\neg p</math> when a prefix operator is desired. | [[A Programming Language]] negates arrays using an overbar symbol like <math>\overline{p}</math>, matching a convention sometimes used in mathematics. In [[APL\360]] the current symbol <syntaxhighlight lang=apl inline>~</syntaxhighlight> was chosen, also due to its use in mathematics. Mathematical usage has arguably diverged from APL in this respect, as the negation of a variable <math>p</math> is now more often written <math>\neg p</math> when a prefix operator is desired. | ||
The arithmetic extension <syntaxhighlight lang=apl inline>~x</syntaxhighlight> {{←→}} <syntaxhighlight lang=apl inline>1-x</syntaxhighlight> was introduced to the array | The arithmetic extension <syntaxhighlight lang=apl inline>~x</syntaxhighlight> {{←→}} <syntaxhighlight lang=apl inline>1-x</syntaxhighlight> was introduced to the array language family by [[J]]. For arguments in the interval <math>[0,1]</math> this extension may be seen as a probabilistic interpretation of negation. | ||
== Extensions == | == Extensions == | ||