[R] purrr::pmap does not work

[Jeff Newmiller]

A) You are not making reproducible examples. Try out the package "reprex" 
to help you recognize when you are forgetting details.

B) I suspect your problem is not understanding formulas. The first thing 
that comes to my mind is using a version of the plot function that does 
not use formulas for the input data specification. E.g.

graphics::plot(
   dataset[[ xvarname ]],
   dataset[[ yvarname ]],
   xlab = "Dependent",
   ylab = "Independent #1"
)

On Wed, 7 Jun 2017, G.Maubach at weinwolf.de wrote:

> Hi All,
>
> I try to do a scatterplot for a bunch of variables. I plot a dependent
> variable against a bunch of independent variables:
>
> -- cut --
> graphics::plot(
>  v01_r01 ~ v08_01_up11,
>  data = dataset,
>  xlab = "Dependent",
>  ylab = "Independent #1"
> )
>
> -- cut --
>
> It is tedious to repeat the statement for all independent variables. Found
> an alternative, i.e. :
>
> -- cut --
>
> mu <- list(5, 10, -3)
> sigma <- list(1, 5, 10)
> n <- list(1, 3, 5)
> fargs <- list(mean = mu, sd = sigma, n = n)
> fargs %>%
>  purrr::pmap(rnorm) %>%
>  str()
>
> -- cut --
>
> I tried to use this for may scatterplot task:
>
> -- cut --
>
> var_battery$v08 <- paste0("v08_", formatC(1:8, width = 2, format = "d",
> flag = "0"))
> v08_var_labs <- paste0("Label_", 1:8)
>
> dataset <- as.data.frame(
>  matrix(
>    data = sample(
>      x = 1:11,
>      size = 90,
>      replace = TRUE),
>    nrow = 10,
>    ncol = 9))
> names(dataset) <- c("v01_r01", var_battery$v08)
>
> independent <- as.list(dataset$v01_r01)
> dependent <- as.list(dataset[var_battery$v08])
>
> fargs <- list(
>  x = independent,
>  y = dependent,
>  ylab = v08_var_labs)
>
> fargs %>%
>  purrr::pmap(
>    function(d = dataset, xvalue = x, yvalue = y,
>             xlab = "Label for x variable",
>             ylab = ylab) {
>      graphics::plot(
>        xvalue ~ yvalue,
>        data = d,
>        xlab = xlab,
>        ylab = ylab)
>    }
>  )
>
> -- cut --
>
> The last statement comes back with
>
> Error: Element 2 has length 8, not 1 or 10.
>
> How can I get it up n running? Do you suggest a better solution for the
> task described?
>
> Kind regards
>
> Georg
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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