I do use for loops a few times per month, but only wrapped around large chunks
of vectorized calculations, not for this kind of use case. In those cases I
also pre-allocate output vectors/lists (e.g. vector( "list", len )) to avoid
memory thrashing as you grow lists or other vectors one element
or this one:
(Vectorize(function(i) log(c1[i + 1] / c1[i])) (1:len))
On Sat, Sep 22, 2018 at 4:16 PM rsherry8 wrote:
>
>
> It is my impression that good R programmers make very little use of the
> for statement. Please consider the following
> R statement:
> for( i in 1:(len-1) ) s[i]
another version just for fun
s <- parallel::pvec(1:len, function(i) log(c1[i + 1] / c1[i]))
On Sat, Sep 22, 2018 at 4:16 PM rsherry8 wrote:
>
>
> It is my impression that good R programmers make very little use of the
> for statement. Please consider the following
> R statement:
> for(
You probably want pattern = "\\.PDF" , as "." has a special meaning for
regex's. However, that really shouldn't make any difference.
Obvious questions:
1. dir() returns a vector of file names. Are they pdf's "PDF" or "pdf"
(case matters!) ?
2. extract.tables() almost certainly wants the full path
Hi All,
I am using the R Tabulizer package to extract tables from a set of pdf
files. Tabulizer creates a list of data frames; each corresponds to a
table in a file. My aim is to create a list of lists, one for each
file.i have 8 files
The code below kept giving me the error "Error in
normalizePat
c1 <- 1:100
len <- 100
system.time(
s1 <- log(c1[-1]/c1[-len])
)
s <- c1[-len]
system.time(
for (i in 1:(len-1)) s[i] <- log(c1[i+1]/c1[i])
)
all.equal(s,s1)
>
> c1 <- 1:100
> len <- 100
> system.time(
+ s1 <- log(c1[-1]/c1[-len])
+ )
user system elapsed
0.032 0.005 0.03
Bob:
Please, please spend some time with an R tutorial or two before you post
here. This list can help, but I think we assume that you have already made
an effort to learn basic R on your own. Your question is about as basic as
it gets, so it appears to me that you have not done this. There are ma
It is my impression that good R programmers make very little use of the
for statement. Please consider the following
R statement:
for( i in 1:(len-1) ) s[i] = log(c1[i+1]/c1[i], base = exp(1) )
One problem I have found with this statement is that s must exist before
the statement is
> On Sep 19, 2018, at 10:48 PM, Ogbos Okike wrote:
>
> Hi David,
> That's it!!! The outcome is attached.
The explanation for this is that columns that have digits separated by dashes
will not be interpreted by R's read.table() as numeric or dates, but rather as
the default for text entries:
On 22/09/2018 4:14 AM, Martin Maechler wrote:
Duncan Murdoch
on Fri, 21 Sep 2018 05:02:32 -0400 writes:
> On 21/09/2018 4:54 AM, Sigbert Klinke wrote:
>> Hi,
>>
>> is it possible to make a link from a vignette to a (Rd)
>> help files in my own or other packages?
Hi Michael
This looks like it could be really helpful in moving my project forwards
thank you.
I remember many years ago using (proprietary) software from the
University of Liverpool which did a nice job of allowing regions to be
defined, and then for the space to be rotated to obtain visual
> Duncan Murdoch
> on Fri, 21 Sep 2018 05:02:32 -0400 writes:
> On 21/09/2018 4:54 AM, Sigbert Klinke wrote:
>> Hi,
>>
>> is it possible to make a link from a vignette to a (Rd)
>> help files in my own or other packages?
> Only with some significant compromis
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