[R] Help needed for getYahooData in TTR package & writing the Yahoo data to excel

[missvanilla]

Dear all, 

I'm totally new to R. Recently I've been trying to use getYahooData in TTR
package in order to download stock index daily open/high/low/close. The
downloaded data is in the format of 

                   Open      High         Low       Close      Volume
2000-01-04 18937.45 19187.61 18937.45 19002.86      0
2000-01-05 19003.51 19003.51 18221.82 18542.55      0
2000-01-06 18574.01 18582.74 18168.27 18168.27      0
2000-01-07 18194.05 18285.73 18068.10 18193.41      0
2000-01-11 18246.10 18887.56 18246.10 18850.92      0
2000-01-12 18780.17 18811.87 18626.92 18677.42      0
2000-01-13 18667.18 18845.03 18667.18 18833.29      0
2000-01-14 18882.99 19058.02 18733.83 18956.55      0
2000-01-17 19025.62 19442.58 19025.62 19437.23      0
2000-01-18 19412.47 19412.47 19145.17 19196.57      0

However, when I attempted to write the data to excel using write.table,
dates in the first colume  become 1,2,3,4 in the excel file. Same problem
happened if write.csv was used. 

If you run these two lines of code you'll get what I meant.. before running
the code, package TTR needs to be loaded. 

>N225 <- getYahooData("^N225", 20000101, )
>write.table(N225,"Nikkei.xls",sep='\t', row.name = TRUE , col.name = NA)

Appreciate your kind assistance! Thanks a lot in advance. 

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