Displaying 1 result from an estimated 1 matches for "tdrreadings010705".
2009 Oct 29
0
What is the best way to efficiently construct a data frame from multiple source files?
...ut into a normal form in the data frame.
The target data frame structure is
str(df)
'data.frame': 23100 obs. of 5 variables:
$ measurement.date: Factor w/ 77 levels "2005/01/07","2003/01/08",..: 1
1 1 1 1 1 1 1 1 1 ...
$ source : Factor w/ 77 levels "TDRREADINGS010705.xls",..: 1 1
1 1 1 1 1 1 1 1 ...
$ location : int 1 1 1 1 1 2 2 2 2 2 ...
$ position : num 1 2 3 4 5 1 2 3 4 5 ...
$ theta.percent : num 24.8 23.5 30.7 26.6 NA 20.7 28.2 24.3 20.6 10 ...
I am successfully using the following (nested) looping-and-rbinding
method, but i...