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:''This | :''This page describes a primitive whose result is a list of indices. See [[Index]] for the page on indices themselves.'' | ||
{{Built-in|Indices|⍸}} or '''Where''', is a [[monadic]] [[primitive function]] which returns the [[Index|indices]] of all ones in a [[boolean]] array. More generally, Indices accepts an array of non-negative integers and copies each index the corresponding number of times. | {{Built-in|Indices|⍸}} or '''Where''', is a [[monadic]] [[primitive function]] which returns the [[Index|indices]] of all ones in a [[boolean]] array. More generally, Indices accepts an array of non-negative integers and copies each index the corresponding number of times. | ||