A long time ago (before the mid-1990's?) with S or S+
ff <- function(n){ for(i in 1:n) (i+1)
op <- ff(3)
would result in 'op' being 4, since a for-loop's value
was the value of the last expression executed in the
body of the loop. The presence of a 'next' or 'break'
in the loop body would af
Ramnik,
a final mail is actually really important: this is to document in the archives,
for the benefit of those who found the thread at a later time, that the
responses indeed solved the problem.
Other than that, the single most important advice is to
- provide a minimal working example of the
(Apparently I hit "send" too early)
1. I have cc'ed this to the list, as others may well have some good
suggestions re: books.
2. The posting guide is your best resource as to what is appropriate
for the list. I defer to others re: conventions, as I have have been
accused of violating them from t
OK. I stand corrected. Thanks.
-- Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sun, Apr 16, 2017 at 11:36 PM, David Winsemius
wrote:
> Both 'for' and
> On 17 Apr 2017, at 10:04 , Ramnik Bansal wrote:
>
> This is my output for is.function
>
>> is.function("for")
> [1] FALSE
>> is.function(for)
> Error: unexpected ')' in "is.function(for)"
>> is.function("next")
> [1] FALSE
>> is.function(next)
> Error: no loop for break/next, jumping to top l
This is my output for is.function
> is.function("for")
[1] FALSE
> is.function(for)
Error: unexpected ')' in "is.function(for)"
> is.function("next")
[1] FALSE
> is.function(next)
Error: no loop for break/next, jumping to top level
*I did not get the TRUE value. R version 3.3.3 on Mac. What am I
Both 'for' and 'next' return TRUE from is.function
is.function('for')
is.function('next')
Not at an R console at the moment but I did check this earlier today. Thinking
of it as different is definitely the way to think about it. (ISTR Bert and I
have had this exchange in the past.)
--
Best
D
David et. al.:
"this levels is the level where you realize that the `for` function is
different from most other R functions. It is really a
side-effect-fucntion. "
for(), while(), if(), next, etc. are *not* functions.
?for says: "These are the basic control-flow constructs of the R language."
> On Apr 16, 2017, at 7:26 PM, Ramnik Bansal wrote:
>
> In the code below
>
>
> *ff <- function(n){ for(i in 1:n) (i+1)}*
>
> *n<-3;ff(n)->op;print(op)*
>
> Why doesnt *print(op) * print 4 and instead prints NULL.
> Isnt the last line of code executed is *i+1 * and therefore that should be
>
In the first case you have a "for" and it is the statement after the
'for' that is the return value and it is a NULL. For example:
> print(for (i in 1:4) i+1)
NULL
In the second case, the last statement if the expression '(n+1)' which
give you the correct value:
> xx <- function(n) n+1
> print(
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