CODEWITHSUNDEEP
rggplot2syntax-error
Antecedent
Antecedent

Reputation: 77

How to subscript +, -, _, and other arithmetic symbols in R

Previous questions on subscripts in R (specifically relating to text in ggplot/annotate/geo arguments) don't quite touch on this issue.

Say I want to have a subscript "+", like

$\Sigma_+$

If I do something like

scale_colour_manual(values = c('red' = 'red','blue' = 'blue'),name = '', 
                  labels = expression(P[+] - P[-] == P[w])

We get an error similar to:

Error: unexpected ']' in:
"scale_colour_manual(values = c('red' = 'red','blue' = 'blue'),name = '', 
labels = expression(P[+]"

Upvotes: 1

Views: 160

Answers (1)

Antecedent
Antecedent

Reputation: 77

I think that R thinks that the + is acting as a arithematic operator, and adding two non-numbers "[" and "]".

The solution is to put make the subscript a character string. I think that some people may forget that this is a possibility.

scale_colour_manual(values = c('red' = 'red','blue' = 'blue'),name = '', 
                  labels = expression(P["+"] - P["-"] == P[w])

Upvotes: 1

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