[R] R function stopped working

[DANIEL PRECIADO]

Thanks! I was not aware of the browser() function, seems pretty useful for debugging.
However, for this particular case, adding it to the mentioned function doesn't do much: Again I get no errors, no output in the terminal and no files are created.

If I include browser() within the for-loop (not defining it as a function, but running it directly), I do get to examine every step of the way, and it runs fine (as expected). But if the exact same for-loop is sitting inside a function, it doesn't do anything at all, with or without browser().

D.

On Tue, 2017-04-04 at 10:19 -0400, Boris Steipe wrote:

I discourage the use of print() for debugging.
Put a browser() statement into your loop and when execution takes you to the debugger interface, examine your variables and expressions one by one.


B.






On Apr 4, 2017, at 10:09 AM, DANIEL PRECIADO <danprec at hotmail.com<mailto:danprec at hotmail.com>> wrote:

To your first comment: Yes, the function used to work, and the loop inside it still does (as indicated in my first email). I wouldn't bother asking otherwise.
To your second, no, specifying the environment in the ls() call doesn't help, the problem persist.


On Tue, 2017-04-04 at 15:26 +0200, peter dalgaard wrote:

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<mailto:danprec at hotmail.com><mailto: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<mailto:danprec at hotmail.com><mailto: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)
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______________________________________________
R-help at r-project.org<mailto: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-guide.html
and provide commented, minimal, self-contained, reproducible code.





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