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siberica
2017 Jul 26
0
[R-pkgs] New Package vetr: Enforce Structural Requirements for S3 Objects
...vet(numeric(1L), 42)
>? [1] TRUE
There is no limit on template complexity:
>> vet(matrix(integer(), ncol=3), matrix(1:12, 3))
>? [1] "`matrix(1:12, 3)` should have 3 columns (has 4)"
>
>> iris.template <- abstract(iris)
>> levels(iris$Species)[3] <- 'sibirica'
>> vet(iris.template, iris[1:10,])
>? [1] "`levels((iris[1:10, ])$Species)[3]` should be \"virginica\"
>? (is \"sibirica\")"
`vetr` implements programmable non-standard evaluation via recursive
substitution of language objects:
>> a <- quote...