: Tue, 23 Jun 2009 15:23:54 -0600
From: Mark Na mtb...@gmail.com
Subject: [R] Apply as.factor (or as.numeric etc) to multiple columns
To: r-help@r-project.org
Message-ID:
e40d78ce0906231423m4c3da14i2f6270f92463c...@mail.gmail.com
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Hi R-helpers,
I
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Message: 99
Date: Tue, 23 Jun 2009 15:23:54 -0600
From: Mark Na mtb...@gmail.com
Subject: [R] Apply as.factor (or as.numeric etc) to multiple columns
To: r-help@r-project.org
Message-ID:
e40d78ce0906231423m4c3da14i2f6270f92463c...@mail.gmail.com
Content
...@gmail.com
Subject: Re: [R] Apply as.factor (or as.numeric etc) to multiple columns
That's quite nice. Three comments:
- colClasses() in R.utils is similar, except for the particular codes and
classes supported, to expandClasses() here.
- not sure if this is important but if as() were the last
Hi R-helpers,
I have a dataframe with 60columns and I would like to convert several
columns to factor, others to numeric, and yet others to dates. Rather
than having 60 lines like this:
data$Var1-as.factor(data$Var1)
I wonder if it's possible to write one line of code (per data type,
e.g.
Hi Mark,
Have a look at colwise (and numcolwise and catcolwise) in the plyr package.
Hadley
On Tue, Jun 23, 2009 at 4:23 PM, Mark Namtb...@gmail.com wrote:
Hi R-helpers,
I have a dataframe with 60columns and I would like to convert several
columns to factor, others to numeric, and yet
Try this:
ix - 2:5
DF[ix] - lapply(DF[ix], as.numeric)
nms - c(x, y)
DF[nms] - lapply(DF[nms], as.factor)
On Tue, Jun 23, 2009 at 5:23 PM, Mark Namtb...@gmail.com wrote:
Hi R-helpers,
I have a dataframe with 60columns and I would like to convert several
columns to factor, others to
Wacek helped me out on a similar topic a while back,
ize =
function (d, columns = names(d), izer = as.factor)
{
d[columns] = lapply(d[columns], izer)
d
}
d = data.frame(x=1:10, y=1:10, z =1:10)
str( ize(d, 'y') ) # y is now a factor
str( ize(d, 1:2, `cumsum`) ) # x and y are affected
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