Function argument within a string

Question

I am attempting to create a function, which would make me easily plot data by a given year from dataframe with data for many years. I have succeeded in doing this. However, I also want the given year to be shown in the title, but can't figure out how to put an argument into the title string.

For simplicity, I will just show a mock function:

my_plot <- function(x){
v1 <- x:10
return(plot(v1, main = "The year of ...y..."))
}
my_plot(x=4)

How do I replace ...y... with an function argument?

Best, Rikki

FYI plot() plots as a side effect, your function is in fact always returning NULL — moodymudskipper
– moodymudskipper, Commented Oct 18, 2022 at 11:56
The graph was made using the given mock function, so I guess it is not returning NULL? — Rikki Franklin Frederiksen
– Rikki Franklin Frederiksen, Commented Oct 18, 2022 at 12:04
It is plotting, but it does return NULL, try foo <- my_plot(x=4);foo — moodymudskipper
– moodymudskipper, Commented Oct 18, 2022 at 12:19
your return() call doesn't hurt but it's a bit misleading, since your function is only called for side effects. I understand this can be confusing, for example ggplot produces real plot objects that you can store in variables. bas exploiting is not like that — moodymudskipper
– moodymudskipper, Commented Oct 18, 2022 at 12:20

RobertoT · Accepted Answer · 2022-10-18 13:29:32Z

1

You can use paste() to combine two different strings:

my_plot <- function(x, year){
v1 <- x:10
return(plot(v1, main = paste("The year of", year))
}
my_plot(x=4)

edited Oct 18, 2022 at 13:29

answered Oct 18, 2022 at 11:44

RobertoT

1,6836 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

moodymudskipper Over a year ago

sep doesn't seem needed here. paste() is a good way to do it, I also like sprintf("The year of &s", year), and then there's also glue::glue("The year of {year}")

Rikki Franklin Frederiksen Over a year ago

Thank you so much guys! I had completely forgotten about the paste function.

RobertoT Over a year ago

@moodymudskipper Right, that was a mistake, idk why I added a comma. Thanks!

Collectives™ on Stack Overflow

Function argument within a string

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related