[R] Converting list with different vector lengths into a dataframe (or export it as .csv)

[Olivereta]

Dear all,

I have this list

years <- list(c("2004", "2007"), c("2010", "2005"), c("2009", "2001"), 
    c("2006", "2000", "2004", "2009"), c("2006", "2000"), c("2006", "2000"), 
    c("2005", "2007"), c("2005", "2007"), c("2001", "2006"), 
    c("2005", "2001", "2008"), c("2005", "2001", "2008"), c("2005", 
    "2000"), c("2005", "2000"), c("2006", "2005", "2003"), c("2006", 
    "2005", "2003"), c("2007", "2004", "2007"), c("2004", "2007"
    ), c("2004", "2007"), c("2004", "2007"), c("2010", "2007"
    ), c("2008", "2005"), c("2008", "2005"), c("2008", "2005"
    ), c("2004", "2007"), c("2004", "2007"), c("2011", "2006"
    ), c("2009", "2005", "2003"), c("2009", "2005", "2003"), 
    c("2009", "2001"), c("2007", "2003", "2004"), c("2007", "2004"
    ), c("2007", "2004"), c("2008", "2010", "2001"), c("2010", 
    "2005"), c("2007", "2005"), c("2007", "2005"), c("2007", 
    "2005"), c("2010", "2005"), c("2010", "2005"), c("2010", 
    "2005"), c("2007", "2005"), c("2007", "2005"), c("2008", 
    "2007"), c("2003", "2005"), c("2003", "2005"), c("2005", 
    "2003"), c("2005", "2003"), c("2005", "2003"))

Each vector represents an location, and the years that this location has
burned. Therefore, I'd like to get a dataframe with each vector on a row,
and the years in columns, but I can't because vectors have different
lengths. 
I have also tried to export it to a csv (and then open it with excel), but I
get the same error. 

Thank a lot in advance for your valuable help.





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