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	:''This page describes a primitive whose result is a list of indices. See [[Index]] for the page on indices themselves. See [[~~Index of~~]] for the index generator.''		:''This page describes a primitive whose result is a list of indices. See [[Index]] for the page on indices themselves. See [[Iota]] for the index generator.''

	{{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.