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Compress was described in [[A Programming Language]], which used the notation <math>/</math> and <math>//</math> for it. It was included in [[APL\360]] changing the doubled slash to a barred slash <source lang=apl inline>⌿</source>, and continued to be included in APLs essentially unchanged until 1980. | Compress was described in [[A Programming Language]], which used the notation <math>/</math> and <math>//</math> for it. It was included in [[APL\360]] changing the doubled slash to a barred slash <source lang=apl inline>⌿</source>, and continued to be included in APLs essentially unchanged until 1980. | ||
In 1980, [[Bob Bernecky]] introduced the extension Replicate to [[SHARP APL]]: he allowed an operand (since SHARP's Replicate is an operator) consisting of non-negative integers rather than just [[Boolean]]s to indicate the number of times to copy.<ref>[[Bob Bernecky|Bernecky, Bob]]. SATN-34: Replication. [[IPSA]]. 1980-08-15.</ref> This extension was implemented in [[NARS]] in 1981, along with further extensions: a similar change to [[Expand]], and the extension allowing negative integers to indicate [[fill | In 1980, [[Bob Bernecky]] introduced the extension Replicate to [[SHARP APL]]: he allowed an operand (since SHARP's Replicate is an operator) consisting of non-negative integers rather than just [[Boolean]]s to indicate the number of times to copy.<ref>[[Bob Bernecky|Bernecky, Bob]]. SATN-34: Replication. [[IPSA]]. 1980-08-15.</ref> This extension was implemented in [[NARS]] in 1981, along with further extensions: a similar change to [[Expand]], and the extension allowing negative integers to indicate [[fill element]]s. Both extensions were quickly adopted by the APL community, and were included in new languages such as [[Dyalog APL]] and [[APL2]], and later the [[ISO/IEC 13751:2001]] standard. | ||
== External Links == | == External Links == | ||