date:20130130

[R] Programmatically give file name to a matrix

2013-01-30 Thread Kumar Mainali

I have a situation when I need to save matrix with file names that are
programmatically created.

for (i in levels(mergeTrn$Continent)) {
matrix here

# I want to save this matrix with a file name that carries i from for
loop. The following does not work.
paste(plotroc_GBM_Trn_, i, sep=) - matrix

}

Thanks,
Kumar

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University of Texas at Austin
Austin, Texas 78712, USA

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[R] Add axes to a 3D scene (afer makeTriangles)

2013-01-30 Thread cgenolin

Hi all,

I am drawing some 3D surfaces using the Triangle tools (package misc3) and
drawScene.rgl. Do you know if it is possible to add axes and graduation on
the scene?

Christophe



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Re: [R] Programmatically give file name to a matrix

2013-01-30 Thread Pascal Oettli


Hello,

?assign

assign(paste(plotroc_GBM_Trn_, i, sep=), matrix(rnorm(100),10,10))

HTH,
Pascal


Le 30/01/2013 17:04, Kumar Mainali a écrit :

I have a situation when I need to save matrix with file names that are
programmatically created.

for (i in levels(mergeTrn$Continent)) {
 matrix here

# I want to save this matrix with a file name that carries i from for
loop. The following does not work.
paste(plotroc_GBM_Trn_, i, sep=) - matrix

}

Thanks,
Kumar



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and provide commented, minimal, self-contained, reproducible code.

Re: [R] Creating dummy variables in r

2013-01-30 Thread peter dalgaard

On Jan 30, 2013, at 04:58 , Bert Gunter wrote:

You almost never need dummy variables in R. R creates them
automatically from factors given model and possibly contrasts
specification.

?contrasts ## for some technical details.

If you have not read An Introduction to R do so now. Pay particular
attention to the chapter on modeling and categorical variables. You
can also google around to find appropriate tutorials. Here is one:

http://www.ats.ucla.edu/stat/r/modules/dummy_vars.htm

I repeat: DO not create dummy variablesby hand in R unless you have
understood the above and have good reason to do so.

In this case it's a cutpoint-type situation, and the user might be excused for
not wanting to deal with the mysteries of cut() (yet).

More importantly, the main issue here seems to be a lack of understanding of
where new variables are located. I.e., if the data set is called dd, you need

dd$prev1 - (etc)

and if you use attach(), do it _after_ modifying the data (or detach() and
reattach).

Otherwise, new variables end up in the global environment. (This is logical
enough once you realize that the result of a computation does not necessarily
fit into the dataset.)

By the way: You don't need ifelse(): as.numeric(ret1 = .5) or even just (ret1
= .5) works.

-- Bert

On Tue, Jan 29, 2013 at 7:21 PM, Joseph Norman Thomson
thoms...@email.arizona.edu wrote:
Hello,

Semi-new r user here and still learning the ropes. I am creating dummy
variables for a dataset on stock prices in r. One dummy variable is
called prev1 and is:

prev1 - ifelse(ret1 = .5, 1, 0)

where ret1 is the previous day's return.

The variable prev1 is created fine and works in my regression model
and for running conditional statistics. However, when I call the
names() function on the dataset the freshly created variable (prev1)
doesn't show up; also, when I export the dataset the prev1 variable
doesn't show up in the exported file. Is there a way to make the
variable show up on both the call function but more importantly on the
exported file? Or am I forced to create dummy variables elsewhere(much
tougher)?

Thanks,

Joe

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Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
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Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd@cbs.dk Priv: pda...@gmail.com

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