plotting a list of grobs

Question

DISCLOSURE: I'm not sure how to make a reproducible example for this question.

I'm trying to plot a list of grobs using the gridExtra package.

I have some code that looks like this:

## Make Graphic Objects for Spec and raw traces
for (i in 1:length(morletPlots)){
  gridplots_Spec[[i]]=ggplotGrob(morletPlots[[i]])
  gridplots_Raw[[i]]=ggplotGrob(rawPlot[[i]])
  gridplots_Raw[[i]]$widths=gridplots_Spec[[i]]$widths
}
names(gridplots_Spec)=names(morletPlots)
names(gridplots_Raw)=names(rawPlot)

## Combine spec and Raw traces
g=list()
for (i in 1:length(rawPlot)){
    g[[i]]=arrangeGrob(gridplots_Spec[i],gridplots_Raw[i],heights=c(4/5,1/5))
}

numPlots = as.numeric(length(g))

##Plot both
for (i in 1:numPlots){

  grid.draw(g[i],ncol=2)
}

Let me walk through the code.

morletPlots = a list of ggplots

rawplot = A list of ggplots

gridplots_spec and gridplots_Raw = list of grobs from the ggplots made above.

g = a list of the two grobs above combined so combining gridplots_spec[1] and gridplots_raw[1] so on and so on for the length of the list.

now my goal would be two plot all of those into 2 columns. But whenever I pass the gridplots_spec[i] through the grid.draw loop I get an error:

Error in UseMethod("grid.draw") : no applicable method for 'grid.draw' applied to an object of class "list"

I can't unlist it becasue it just turns into a long character vector. any ideas?

If it's absolutely crucial I can spend the time to make an reproducible example but I'm more likely just missing a simple step.

plotting a list of grobs

1 Answers