Subscripts in R when adding other text

r plotmath
Damien picture Damien · Dec 19, 2012 · Viewed 10.5k times · Source

How would you add a subscript to one particular word of a title in R? For example, suppose the title is "A_2 and B_2." How would you add these two subscripts? I know that expression("A"[2]) and expression("B"[2]) individually add subscripts to these letters.

Answer

IRTFM picture IRTFM · Dec 19, 2012

You do not need paste (or quotes for that matter) at all:

expression( A[2]~and~B[2] )

Test:

plot(1,1, main=expression( A[2]~and~B[2] ) )

The syntactic principle is that tildes (which creates a space) and asterisks (non-space plotmath separator) are used to separate items and that no quotes are needed unless you are using a plotmath function name .... such as wanting the word "paste" or "sqrt" to appear in the displayed version of the expression.

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