[R] R function stopped working

[peter dalgaard]

Given the following little experiment

> foobar <- 1
> f <- function() ls()
> f()
character(0)
> f <- function(x) ls()
> f(2)
[1] "x"
> 

... I am pretty sure that your code _never_ actually worked. 

It probably helps if you tell ls() which environment to list, as in:

> f <- function() ls(.GlobalEnv)
> f()
[1] "f"      "foobar"


> On 4 Apr 2017, at 12:27 , DANIEL PRECIADO <danprec at hotmail.com> wrote:
> 
> Thanks, but printing doesn't work within the function either. (i.e, no
> result or output, or error). Also, like I said, the loop is working
> fine on its own (so the path, name, filename, and all other variables
> called from the function exist, are available and are recognized just
> fine). It just doesn't do anything (anymore) if the loop is inside a
> function.
> 
> 
> On Tue, 2017-04-04 at 11:21 +0200, peter dalgaard wrote:
>> How about inserting print() statements on the output of "ls()" and
>> the value of "filename". In particular, is the value of Plots_path
>> the same as last week?
>> 
>> -pd
>> 
>> 
>>> On 4 Apr 2017, at 10:50 , DANIEL PRECIADO <danprec at hotmail.com>
>>> wrote:
>>> 
>>> The following function is supposed to search the workspace and save
>>> plots  (i.e. listing all objects in the workspace named "Figs",
>>> which
>>> are all ggplot2 plots, and saving them as png files)
>>> 
>>> SaveFigs <- function()
>>> {
>>> 	for (i in ls(pattern="_Figs_"))
>>> 	{
>>> 		filename = paste(Plots_Path, i, ".png", sep="")
>>> 		png(filename)
>>> 		print(eval(as.name(i)))
>>> 		dev.off()
>>> 	}
>>> }
>>> 
>>> 
>>> It was working perfectly until some days ago, but now nothing
>>> happens
>>> when the function is called. No error, no output, no result, no
>>> files,
>>> nothing at all. Completely useless.
>>> 
>>> If I run the for loop inside alone, without the function, it works
>>> perfectly and produces the expected result (png files in the
>>> defined
>>> folder). But running it as a function doesn't do anything at all.
>>> 
>>> Can anyone explain why did this function simply and suddenly
>>> stopped
>>> working?
>>> 
>>> (using R version 3.3.3 on an ubuntu 16.10, if that is of any help)
>>> ______________________________________________
>>> R-help at 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-g
>>> uide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>> 
>> 

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com