Hello,
If I have a four column data set (with thousands of rows), that
doesn't have a header, how do I load in this text file, WITHOUT a row added
for naming(i.e. numbering the rows, 1 2 3 4 5......).
Also, if a row is added for naming, then will it be actually included in the
data? That is, will that numbered row be included in analysis I run? (like
PCA)
Thanks!
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At 7/15/2004 02:35 PM Thursday, you wrote:>Hello, > If I have a four column data set (with thousands of rows), that >doesn't have a header, how do I load in this text file, WITHOUT a row added >for naming(i.e. numbering the rows, 1 2 3 4 5......). >Also, if a row is added for naming, then will it be actually included in the >data? That is, will that numbered row be included in analysis I run? (like >PCA)I assume you really mean "a column added for naming the rows". My understanding is that data frames always have row names, but matrices do not. If memory is limiting (probably not), you could read the data into a matrix instead of a data frame. To answer your other question, row names are NOT included in any analysis. They are saved as character strings anyway, not numbers. MHP
The rownames of a data.frame are there for reference; they are not
considered a column in your data set and will not be included in any
analyses. The short answer as to whether you should try to remove them is
no. To read in the file, use read.table(file, header=F), as you probably
already discovered.
Kevin
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Herman, David
(NIH/NIMH)
Sent: Thursday, July 15, 2004 11:35 AM
To: 'r-help at stat.math.ethz.ch'
Subject: [R] row naming
Hello,
If I have a four column data set (with thousands of rows), that
doesn't have a header, how do I load in this text file, WITHOUT a row added
for naming(i.e. numbering the rows, 1 2 3 4 5......).
Also, if a row is added for naming, then will it be actually included in the
data? That is, will that numbered row be included in analysis I run? (like
PCA)
Thanks!
[[alternative HTML version deleted]]
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