[R] Why don't the comments appear in the function?

[Duncan Murdoch]

On 24/11/2019 6:06 p.m., bickis using math.usask.ca wrote:
> I have made a list in which each element is a function.   If I print
> individual elements of the list, then the function code is shown along
> with embedded comments.  However, if I print the list or sublist, then the
> function code is shown without comments.   Why (and how) are the comments
> hidden?

Hi Mik.  I see the same behaviour as Bert, not what you see.

Generally the comments will be shown if the "srcref" attribute is 
attached to the function, and it is a valid one.  That shouldn't change 
between looking at flist[[3]] and flist[3].  If it's not there or not 
valid, you'll see a deparsed version of the function; that's what your 
flist[3]$btv looks like.

It's possible this is R 3.3.2-specific; that's a relatively old version 
now, but I don't know of any change that would cause this.  Can you show 
us the code that you used to create flist, or enough of it to show this 
behaviour?  Showing us (or me privately) dput(flist) might be enough to 
see what's going on.

Duncan Murdoch

> 
>> flist[[3]]
> function(y,brackets,rates){
> 	# Calculates before-tax income required to realized value y
> 	ints<-c(0,cumsum(diff(brackets)*rates[1:(length(rates)-1)]))-brackets*rates
> 	x<-(y+ints)/(1-rates)
> 	x[sum(x>brackets)]
> }
> 
> 
>> flist[3]
> $btv
> function (y, brackets, rates)
> {
>      ints <- c(0, cumsum(diff(brackets) * rates[1:(length(rates) -
>          1)])) - brackets * rates
>      x <- (y + ints)/(1 - rates)
>      x[sum(x > brackets)]
> }
> 
> I am running R 3.3.2 on Mac OS X  10.10.5
> 
> Mik Bickis
> 
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