Creating List of Objects

[ganapap1]

Hi Good Morning
I have a shiny app that creates dynamically ggplots (scatterplots) and assign it to dynamically created names eg plot1, plot2, plot3 and so on
when i bring it to dashboard, i use grid.arrange. my concern is some times 10 plots and some times 8. but in grid.arrange function i have to specify the list of plots. I tried to create the list for the grid.arrange function. but I dont get it as given below. it all comes with quotes that the function does not accept.

grid.arrange(grobs =list(plot1,plot2,plot3,plot4,plot5,plot6,plot7,plot8),nrow=r, ncol=c)

i would like to create dynamically a list of object names that i have created for plots and mention the list name inside grid.arrange function. could someone help me out please
Thank you very much

[AlexisW]

The best thing to do in your case is simply to actually make a list of plots. Dynamically generating variable names is almost always a bad idea.

For example, something like:

my_plots <- list()

my_plots[[1]] <- ggplot(mtcars) +
  geom_point(aes(x = mpg, y = gear))
my_plots[[2]] <- ggplot(mtcars) +
  geom_point(aes(x = mpg, y = wt))

gridExtra::grid.arrange(grobs = my_plots)

That being said, if you really want to transform strings into code, you can use str2expression() and then eval(). I repeat here it's probably better not to do that if you can instead use a list which is meant for that exact purpose.

string1 <- "aa"
string2 <- "bb"


eval(str2expression("paste0(string1, string2)"))
#> [1] "aabb"

[ganapap1]

Excellent - Thank you so much AlexisW. my problem is solved with your " list" approach