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Code Golf

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    \$\begingroup\$ use l<-... instead of (l=...); it's a byte shorter :-) \$\endgroup\$ Commented May 19, 2020 at 17:03
  • \$\begingroup\$ Thanks again Giuseppe! BTW: do you have any idea why <- should be designed to behave differently to = in this context (apart from sneaky code golf use)? \$\endgroup\$ Commented May 19, 2020 at 19:36
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    \$\begingroup\$ The docs say The operators <- and = assign into the environment in which they are evaluated. The operator <- can be used anywhere, whereas the operator = is only allowed at the top level (e.g., in the complete expression typed at the command prompt) or as one of the subexpressions in a braced list of expressions. So since l is actually an argument to the [ function, it's not at the top level. Or so I believe. \$\endgroup\$ Commented May 19, 2020 at 19:43
  • \$\begingroup\$ Thank you: I will try to digest what that means. It's quite disconcerting to imagine that I might actually learn something useful while trying to just waste my time code golfing... \$\endgroup\$ Commented May 19, 2020 at 19:54
  • \$\begingroup\$ You're not the only one! Myself included, haha. Sometimes my golfing habits kick in when writing real R code, though... \$\endgroup\$ Commented May 19, 2020 at 19:55