[R] one command on several lines

[Nick Kostrov]

Hello!

Is it possible to continue expand one command on several lines in R ?

An attempt to write

a=c(1990," ",1991,
      1992, 
      1993,1994,1995,1996,1997,1998,
     1999)

in a file and then 

source('file')

results in 

Error in parse(file, n, text, prompt) : syntax error on line 55 



Thanks.

Nick
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