argument 3 matches multiple formal arguments

[Bzlka]

Hi

I am new to Rstudio and trying to figure out the error from the code below:

library(FrF2)
plan <- FrF2(k = 7,nruns= 16, res=4, generators = "E=ABC","F=ABD","G=ACD",randomize=FALSE)

Error in FrF2(k = 7, nruns = 16, res = 4, generators = "E=ABC", "F=ABD", :
argument 3 matches multiple formal arguments

Thank you

[cderv]

I think generators argument should be providing a vector c(...). I guess E=, F= and G= are together right ?

[technocrat]

Hi, and welcome!

I'm going try to sneak up on this by starting out with something that appears to work, and illustrates that k, which is not an argument in the FrF2 signature, doesn't do anything

suppressPackageStartupMessages(library(FrF2))

gen3 <- FrF2(k = 7, nruns = 16, generators = 3, randomize = FALSE)
no_k <- FrF2(nruns = 16, generators = 3, randomize = FALSE)
gen3 == no_k
#>       A    B    C    D    E
#> 1  TRUE TRUE TRUE TRUE TRUE
#> 2  TRUE TRUE TRUE TRUE TRUE
#> 3  TRUE TRUE TRUE TRUE TRUE
#> 4  TRUE TRUE TRUE TRUE TRUE
#> 5  TRUE TRUE TRUE TRUE TRUE
#> 6  TRUE TRUE TRUE TRUE TRUE
#> 7  TRUE TRUE TRUE TRUE TRUE
#> 8  TRUE TRUE TRUE TRUE TRUE
#> 9  TRUE TRUE TRUE TRUE TRUE
#> 10 TRUE TRUE TRUE TRUE TRUE
#> 11 TRUE TRUE TRUE TRUE TRUE
#> 12 TRUE TRUE TRUE TRUE TRUE
#> 13 TRUE TRUE TRUE TRUE TRUE
#> 14 TRUE TRUE TRUE TRUE TRUE
#> 15 TRUE TRUE TRUE TRUE TRUE
#> 16 TRUE TRUE TRUE TRUE TRUE

^{Created on 2019-11-28 by the reprex package (v0.3.0)}

Looking at gen3, we can see quite a bit

# omitted duplicate reprex output from first example,

str(gen3)
#> Classes 'design' and 'data.frame':   16 obs. of  5 variables:
#>  $ A: Factor w/ 2 levels "-1","1": 1 2 1 2 1 2 1 2 1 2 ...
#>   ..- attr(*, "contrasts")= num [1:2, 1] -1 1
#>   .. ..- attr(*, "dimnames")=List of 2
#>   .. .. ..$ : chr  "-1" "1"
#>   .. .. ..$ : NULL
#>  $ B: Factor w/ 2 levels "-1","1": 1 1 2 2 1 1 2 2 1 1 ...
#>   ..- attr(*, "contrasts")= num [1:2, 1] -1 1
#>   .. ..- attr(*, "dimnames")=List of 2
#>   .. .. ..$ : chr  "-1" "1"
#>   .. .. ..$ : NULL
#>  $ C: Factor w/ 2 levels "-1","1": 1 1 1 1 2 2 2 2 1 1 ...
#>   ..- attr(*, "contrasts")= num [1:2, 1] -1 1
#>   .. ..- attr(*, "dimnames")=List of 2
#>   .. .. ..$ : chr  "-1" "1"
#>   .. .. ..$ : NULL
#>  $ D: Factor w/ 2 levels "-1","1": 1 1 1 1 1 1 1 1 2 2 ...
#>   ..- attr(*, "contrasts")= num [1:2, 1] -1 1
#>   .. ..- attr(*, "dimnames")=List of 2
#>   .. .. ..$ : chr  "-1" "1"
#>   .. .. ..$ : NULL
#>  $ E: Factor w/ 2 levels "-1","1": 2 1 1 2 2 1 1 2 2 1 ...
#>   ..- attr(*, "contrasts")= num [1:2, 1] -1 1
#>   .. ..- attr(*, "dimnames")=List of 2
#>   .. .. ..$ : chr  "-1" "1"
#>   .. .. ..$ : NULL
#>  - attr(*, "desnum")= num [1:16, 1:5] -1 1 -1 1 -1 1 -1 1 -1 1 ...
#>   ..- attr(*, "dimnames")=List of 2
#>   .. ..$ : chr  "1" "2" "3" "4" ...
#>   .. ..$ : chr  "A" "B" "C" "D" ...
#>  - attr(*, "run.order")='data.frame':    16 obs. of  3 variables:
#>   ..$ run.no.in.std.order: Factor w/ 16 levels "1","2","3","4",..: 1 2 3 4 5 6 7 8 9 10 ...
#>   ..$ run.no             : int  1 2 3 4 5 6 7 8 9 10 ...
#>   ..$ run.no.std.rp      : Factor w/ 16 levels "1","2","3","4",..: 1 2 3 4 5 6 7 8 9 10 ...
#>  - attr(*, "design.info")=List of 12
#>   ..$ type        : chr "FrF2.generators"
#>   ..$ nruns       : num 16
#>   ..$ nfactors    : num 5
#>   ..$ factor.names:List of 5
#>   .. ..$ A: num  -1 1
#>   .. ..$ B: num  -1 1
#>   .. ..$ C: num  -1 1
#>   .. ..$ D: num  -1 1
#>   .. ..$ E: num  -1 1
#>   ..$ generators  : chr "E=AB"
#>   ..$ aliased     :List of 3
#>   .. ..$ legend: chr  "A=A" "B=B" "C=C" "D=D" ...
#>   .. ..$ main  : chr  "A=BE" "B=AE" "E=AB"
#>   .. ..$ fi2   : chr 
#>   ..$ FrF2.version: chr "2.1"
#>   ..$ replications: num 1
#>   ..$ repeat.only : logi FALSE
#>   ..$ randomize   : logi FALSE
#>   ..$ seed        : NULL
#>   ..$ creator     : language FrF2(k = 7, nruns = 16, generators = 3, randomize = FALSE)

^{Created on 2019-11-28 by the reprex package (v0.3.0)}

In particular the generator is identified.

attr(gen3, "design.info")$generators
[1] "E=AB"

But E=AB doesn't work as an argument

FrF2(k = 7, nruns = 16, generators = "E = AB", randomize = FALSE)
Error in gen.check(k, generators) : 
  All generators must contain integer numbers from 1 to 4 
 or letters from A to D only.
<error/rlang_error>
All generators must contain integer numbers from 1 to 4 
 or letters from A to D only.
Backtrace:
    █
 1. └─FrF2::FrF2(k = 7, nruns = 16, generators = "E = AB", randomize = FALSE)
 2.   └─FrF2:::gen.check(k, generators)
> 

I didn't find a way to specify the generators argument using any of "A", "B", "C", or "D".

And, of [1:4], only 4 works as an argument. Any of [1:3] produce

> FrF2(k = 7, nruns = 16, generators = 1, randomize = FALSE)
Error in gen.check(k, generators) : 
  This design is of resolution II and is not permitted in package FrF2.
<error/rlang_error>
This design is of resolution II and is not permitted in package FrF2.
Backtrace:
    █
 1. └─FrF2::FrF2(k = 7, nruns = 16, generators = 1, randomize = FALSE)
 2.   └─FrF2:::gen.check(k, generators)

Providing res as an argument returns the error you reported for, seemingly any integer. The FrF2 signature has no res and doesn't use ...

Looking at body(FrF2), there's no error message regarding multiple formal arguments. Moving res around produces the message, indicating that nothing positional in the formal argument is required.

So, the only arguments to FrF2 that I was able to use to produce an object of class design had to omit res and provide 3 as the sole argument to generators.

Why this should be is unclear.