On Jun 29, 2014, at 3:22 PM, Robert Sherry wrote:
I created the following file:
symbol,shares
XOM,1000
APA,400
CVX,200
I then read the file in R using the command:
stockList=read.table("/NotesOnR/stockList", header = T, sep=",")
I would then expect the following expression to evaluate to the simple
string APA:
stockList$symbol[2]
However when I type that in on the command line, I get:
[1] APA
Levels: APA CVX XOM
I would also expect to be able to print out the table by using the
command:
for( i in 1:3 ) {
print( stockList$symbol[i] )
print ( stockList$shares[i] )
}
However, as part of the output I get:
Levels: APA CVX XOM
I do not understand what is going on. Also, when I try passing the
expression stockList$symbol to a standard function in R, it does not
work.
I think that I am missing something here but I am not sure what I am
missing.
You are missing the fact that a factor variable was created. If you
had added stringsAsFactors=FALSE to your read.table code, you would
ahve gotten what you expected.
Should I be writing code like:
for ( i in stockList$smybol )
However, given the symbol, I am not sure how to get the share count
that is
in the same row.
I thank the group in advance for their responses.
Bob
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David Winsemius, MD
Alameda, CA, USA
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
