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Source-file update for PR 1634 (#1635)

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John Kerl 2024-08-27 11:42:24 -04:00 • committed by GitHub
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docs/src/reference-dsl-variables.md
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@ -157,7 +157,7 @@ a=wye,b=pan,i=5,x=0.573288,y=0.863624
!!! note
You can use positional field names only in `DSL` syntax, so only with the verbs `put` and `filter`.
You can use positional field names only in the [Miller DSL](reference-dsl.md), i.e. only with the verbs `put` and `filter`.
## Out-of-stream variables

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docs/src/reference-dsl-variables.md.in
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@ -80,6 +80,10 @@ GENMD-RUN-COMMAND
mlr put '$[[[6]]] = "NEW"' data/small
GENMD-EOF
!!! note
You can use positional field names only in the [Miller DSL](reference-dsl.md), i.e. only with the verbs `put` and `filter`.
## Out-of-stream variables
These are prefixed with an at-sign, e.g. `@sum`. Furthermore, unlike built-in variables and stream-record fields, they are maintained in an arbitrarily nested map: you can do `@sum += $quantity`, or `@sum[$color] += $quantity`, or `@sum[$color][$shape] += $quantity`. The keys for the multi-level map can be any expression which evaluates to string or integer: e.g. `@sum[NR] = $a + $b`, `@sum[$a."-".$b] = $x`, etc.