[R] subsetting ls() as per class...

[Henrik Bengtsson]

The ll() function of R.oo returns a data.frame with various attributes that
you can subset on, e.g.

> subset(R.oo::ll(), data.class %in% c("zoo", "xts"))
       member data.class dimension objectSize
2          fz        zoo        10       1344
4  sample.xts        xts  c(180,4)      10128
5           x        zoo         5        528
6          x1        zoo         5        880
7          x2        zoo         5        496
9           y        zoo         5       1040
11          z        zoo    c(5,3)       1184
12         z0        zoo         0        448
13         z2        zoo    c(4,3)        904
14        z20        zoo    c(4,0)        616
15         z3        zoo         8        528
16         z4        zoo         5        592
17         z5        zoo         5        792

Henrik

On Sat, Jul 28, 2018, 08:22 Jeff Newmiller <jdnewmil using dcn.davis.ca.us> wrote:

> You can extract the names into a character vector with ls and then use
> grep(..., values=TRUE ) to select which ones you want to remove, and then
> pass that list to rm.
>
> However, due to the way R handles memory you are unlikely to see much
> savings by doing this. I would recommend focusing on creating a script or
> series of scripts that can allow you to re-create your analysis, and then
> restarting R whenever you are ready to reduce memory usage. This will have
> the side benefit of leaving you with a verified-complete record of how your
> analysis was done.
>
> On July 27, 2018 10:58:36 PM PDT, akshay kulkarni <akshay_e4 using hotmail.com>
> wrote:
> >dear memebers,
> >I am using R in AWS linux instance for my research. I want to remove
> >certain objects from the global environment  to reduce my EBS cost..for
> >example, I want to remove all objects of class "xts", "zoo". Is there
> >any way to automate this, instead of removing the objects one by one?
> >
> >Basically, I want to subset  ls() according to class, and then remove
> >that subset by using rm function.
> >
> >I got to know about mget in SO, but that is not working in my case....
> >
> >Also, all the above objects end with ".NS".  I came to know that you
> >can remove objects starting with a certain pattern; is there any way to
> >remove objects ending in a certain pattern?
> >
> >very many thanks for your time and effort...
> >yours sincerely,
> >AKSHAY M KULKARNI
> >
> >       [[alternative HTML version deleted]]
> >
> >______________________________________________
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> >http://www.R-project.org/posting-guide.html
> >and provide commented, minimal, self-contained, reproducible code.
>
> --
> Sent from my phone. Please excuse my brevity.
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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