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Showing content from https://winvector.github.io/cdata/reference/build_unpivot_control.html below:

Build a rowrecs_to_blocks() control table that specifies a un-pivot (or "shred"). — build_unpivot_control • cdata

Some discussion and examples can be found here: https://winvector.github.io/FluidData/FluidData.html and here https://github.com/WinVector/cdata.

build_unpivot_control(
  nameForNewKeyColumn,
  nameForNewValueColumn,
  columnsToTakeFrom,
  ...
)
Arguments nameForNewKeyColumn

character name of column to write new keys in.

nameForNewValueColumn

character name of column to write new values in.

columnsToTakeFrom

character array names of columns to take values from.

...

not used, force later args to be by name

Value

control table

See also

rowrecs_to_blocks

Examples 
build_unpivot_control("measurmentType"
, 
"measurmentValue"
, 
c("c1"
, 
"c2"))

#>   measurmentType measurmentValue
#> 1             c1              c1
#> 2             c2              c2

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