R help - Feb 2013 - Seeing Global Workspace and dealing with attach and detach

Hi,

When writing a script, I often start with:

library(ISwR)
attach(thuesen)

Then write some more code, testing it as I write to see if it runs.

Then, at the end, a final:

detach(thuesen)

However, what happens is that I often get errors, which cause an attach, but
no subsequent detach. Now, I can fix the problem at the console window with
several:

detach(thuesen)
detach(thuesen)
detach(thuesen)
detach(thuesen)
detach(thuesen)

Until they are finally all closed.  Two questions:

1. What is a more efficient method?

2. What is the command again for viewing the global workspace?

D.



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In general, creating variables while attached leads to problems such as you
describe. Normally the recommendation is to avoid the use of attach and detach
entirely in favor of explicit reference to the data frame using [[]], [,], $,
and the data= argument supported by many functions.
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David Arnold <dwarnold45 at suddenlink.net> wrote:
>Hi,
>
>When writing a script, I often start with:
>
>library(ISwR)
>attach(thuesen)
>
>Then write some more code, testing it as I write to see if it runs.
>
>Then, at the end, a final:
>
>detach(thuesen)
>
>However, what happens is that I often get errors, which cause an
>attach, but
>no subsequent detach. Now, I can fix the problem at the console window
>with
>several:
>
>detach(thuesen)
>detach(thuesen)
>detach(thuesen)
>detach(thuesen)
>detach(thuesen)
>
>Until they are finally all closed.  Two questions:
>
>1. What is a more efficient method?
>
>2. What is the command again for viewing the global workspace?
>
>D.
>
>
>
>--
>View this message in context:
>http://r.789695.n4.nabble.com/Seeing-Global-Workspace-and-dealing-with-attach-and-detach-tp4659105.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

Jeff Newmiller <jdnewmil <at> dcn.davis.ca.us> writes:
> In general, creating variables while attached leads to problems such
> as you describe. Normally the recommendation is to avoid the use of
> attach and detach entirely in favor of explicit reference to the
> data frame using [[]], [,], $, and the data= argument supported by
> many functions.
And with() and within() [as well as transform(), mutate(), subset(), etc.:
see http://r4stats.com/2013/01/22/comparing-tranformation-styles/
[sic "tranformation"]