R Utilities: Include an Index to a Data Frame
This function includes an index variable to a data frame in the first column.
index.dataframe(data,systime=FALSE)
data |
Data frame |
systime |
Should system time be included in the second column of the data frame? |
dfr <- matrix( 2*1:12-3, 4,3 )
colnames(dfr) <- paste0("X",1:ncol(dfr))
index.dataframe( dfr)
## index X1 X2 X3
## 1 1 -1 7 15
## 2 2 1 9 17
## 3 3 3 11 19
## 4 4 5 13 21
index.dataframe( dfr, systime=TRUE)
## index file_created X1 X2 X3
## 1 1 2013-08-22 10:26:28 -1 7 15
## 2 2 2013-08-22 10:26:28 1 9 17
## 3 3 2013-08-22 10:26:28 3 11 19
## 4 4 2013-08-22 10:26:28 5 13 21Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.