[R] ggplot: combining geom's in function

[Jeff Newmiller]

Have you looked at the qplot function in the ggplot2 package?
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Sent from my phone. Please excuse my brevity.

On October 23, 2015 3:12:41 PM GMT+02:00, sbihorel <Sebastien.Bihorel at cognigencorp.com> wrote:
>Hi,
>
>Next adventure into my journey from lattice to ggplot: I would like to 
>create a custom generic function that combines multiple existing geom's
> 
>in order to reproduce what the lattice panel.xyplot function does based
>
>on the type argument (ie, plotting points only for type='p', plotting 
>lines for type 'l', etc).
>
>My current naive attempt is:
>
>library(lattice)
>library(ggplot2)
>
>geom_xyplot <- function (mapping = NULL, data = NULL, stat =
>"identity",
>                          position = "identity", na.rm = FALSE, type = 
>'p', ...) {
>
>   if (any(type=='p')){
>     geom_point(mapping = mapping, data = data, stat = stat,
>                position = position, na.rm = na.rm, ...)
>   }
>   if (any(type=='l')){
>     geom_path(mapping = mapping, data = data, stat = stat,
>               position = position, na.rm = na.rm, ...)
>   }
>   if (any(type%in%c('b','o'))){
>     geom_point(mapping = mapping, data = data, stat = stat,
>                position = position, na.rm = na.rm, ...) +
>       geom_path(mapping = mapping, data = data, stat = stat,
>                 position = position, na.rm = na.rm, ...)
>   }
>}
>
>data <- data.frame(x = rep(1:4, each = 25),
>                    y = rep(1:25, times = 4),
>                    g = rep(1:4, each = 25))
>data$x <- data$x + 0.005*(data$y)^2-0.1*data$y+1
>
>ggplot(data2, aes(x, y, group = g, colour = factor(g))) + 
>geom_xyplot(type = 'l')
>
>I get:
> > Error: No layers in plot
>
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