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:''This page describes the dyadic arithmetic function. For sign of a single argument, see [[Signum]].''
:''This page describes the dyadic arithmetic function. For sign of a single argument, see [[Signum]].''


{{Built-in|Product|×}}, '''Times''', or '''Multiplication''' is a [[dyadic]] [[scalar function]] which gives the arithmetic product of its [[argument]]s. Subtract shares the [[glyph]] <source lang=apl inline>×</source> with the monadic arithmetic function [[Signum]], and its result is the left argument times the right argument.
{{Built-in|Product|×}}, '''Times''', or '''Multiply''' is a [[dyadic]] [[scalar function]] which gives the arithmetic product of its [[argument]]s. Subtract shares the [[glyph]] <source lang=apl inline>×</source> with the monadic arithmetic function [[Signum]], and its result is the left argument times the right argument.


== Examples ==
== Examples ==

Revision as of 07:35, 26 April 2020

This page describes the dyadic arithmetic function. For sign of a single argument, see Signum.
×

Product (×), Times, or Multiply is a dyadic scalar function which gives the arithmetic product of its arguments. Subtract shares the glyph × with the monadic arithmetic function Signum, and its result is the left argument times the right argument.

Examples

A long, slow way to write `!10`:

×/⍳10

Properties

Subtraction is commutative: swapping the arguments don't affect the result, e.g. using Commute, *⍨.

Reduction and scan

Reduction with Product gives the product of the whole list.

External links

Documentation