Adding output of print function to ggplot chart - r

Question

Say I have a dataframe:

df <- data.frame(x=1:10, y=4:13)
p <- ggplot(df,aes(x,y)) + geom_point()

Now I want to add many things to this graph, so I use a big paste function and print the output. Just as an example, say I wanted to add the word 'bananas' inside the x axis label.

x <- "bananas"    
print(paste0("+ xlab('Price of", x[1], "')"), quote=F)

If I try:

p + print(paste0("+ xlab('Price of", x[1], "')"), quote=F)

then it obviously does not work. But is there a way of adding the output of this function to the ggplot object 'p' without cutting/pasting from the console?

i.e. so we automatically can execute:

p + xlab('Price ofbananas')

Molx · Accepted Answer · 2015-03-31 02:51:59Z

1

If you want to add Price of bananas as the x label, then:

p + xlab(paste0("Price of ", x[1]))

Remember you're adding the xlab, so that should be your outside function. Inside it, you add/create the label you want. No need to print.

Update:

I think what you want is eval(parse(text=xxx)). For example:

add <- paste0("xlab('Price of ", x[1], "')")
p + eval(parse(text=add))

Note that I removed the + from the text, because you need it next to p to connect with eval.

I'm not sure why you would do this, but it works.

edited Mar 31, 2015 at 2:51

answered Mar 31, 2015 at 1:58

Molx

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3 Comments

jalapic Over a year ago

I'm looking for a more general solution - I have numerous additional themes/labels/etc to add inside of a function.

hd1 Over a year ago

Then just store the output in variables.

Molx Over a year ago

I guess I understood what you want: You want the code xlab() and others to be stored inside a variable and them add them all at once, right?

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