r - Input must be grobs Erorr when using do.call() -


i trying create 4 parallel coordinate plots big figure. below toy data make reproducible has no particular meaning other mimicking real data of meaning.

library(ggally) library(gridextra) library(ggplot2) cnum=4   x = data.frame(a=2*runif(100)-1,b=2*runif(100)-1,c=2*runif(100)-1,d=2*runif(100)-1,e=2*runif(100)-1)   plot_i = vector("list", length=cnum)   (i in 1:4){     x = x +     plot_i[[i]] = ggparcoord(x, columns=1:5, alphalines=0.5)     do.call("grid.arrange", c(plot_i, ncol=1))    }

here, seems error occurs on first iteration of do.call part. error:

error in arrangegrob(..., as.table = as.table, clip = clip, main = main,  :    input must grobs!

i see well-searched error, although solution seems dependent on context. instance, here, user misused ncol (error grid.arrange:input must grobs) not seem situation. thank you...


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