While doing some speed testing I noticed that in R-3.2.3 the perl=TRUE
variants of strsplit() and gregexpr() took time proportional to the
square of the number of pattern matches in their input strings. E.g.,
the attached test function times gsub, strsplit, and gregexpr, with
perl TRUE (PCRE) and
> Mick Jordan
> on Wed, 4 Jan 2017 12:49:41 -0800 writes:
> On 1/4/17 8:15 AM, Mick Jordan wrote:
> Here is another difference that I am guessing is unintended.
>> y <- seq.int(1L, 3L, length.out=2)
>> typeof(y)
> [1] "double"
>> x <- seq.default(1L, 3L, lengt
> Mick Jordan
> on Wed, 4 Jan 2017 08:15:03 -0800 writes:
> On 1/4/17 1:26 AM, Martin Maechler wrote:
>>> Mick Jordan
>>> on Tue, 3 Jan 2017 07:57:15 -0800 writes:
>> > This is a message for someone familiar with the implementation.
>> > Superficially the
