search for: pmatch

The pmatch help (see also section 4.3.2 in the R Language Definition) claims that pmatch with duplicates.ok=FALSE provides the same functionality as R's argument matching algorithm, modulo how empty strings are matched. Here's an undocumented inconsistency between pmatch and R's argument matching...

...precation cycle to give everyone who uses `[.data.frame` and relies on partial matching (whether they know it or not) enough time to adjust. Still, adding an argument feels like a small change: edit https://svn.r-project.org/R/trunk/src/library/base/R/dataframe.R and add a condition before calling pmatch(). Adjust the warning() for named arguments. Don't forget to document the new argument in the man page at https://svn.r-project.org/R/trunk/src/library/base/man/Extract.data.frame.Rd Index: src/library/base/R/dataframe.R =================================================================== --- s...

Hi folks, Can anyone suggest an efficient way to do "matching without replacement", or "one-to-one matching"? pmatch() doesn't quite provide what I need... For example, lookupTable <- c("a","b","c","d","e","f") matchSample <- c("a","a","b","d") ##Normal match() behaviour: match(matchSample,lookupTable)...

I am using R0.64.1 under Windows 95. The help for `pmatch' states that: If `duplicates.ok' is false multiple matches will result in the value of `nomatch' being returned, and if it is true, the index of the first matching value will be returned. The help for pmatch gives the following examples: pmatch...

...ime complexity of the various approaches, https://tdhock.github.io/blog/2023/df-partial-match/ The asymptotic complexity of partial matching appears to be quadratic O(N^2) whereas the other approaches are asymptotically faster: linear O(N) or log-linear O(N log N). I think that accepting Ivan's pmatch.rows patch would add un-necessary complexity to base R, since base R already provides an efficient work-around, d1[match(q1,rownames(d1)),] I do think the CheckUserInterrupt patch is a good idea, though. Best, Toby On Sat, Dec 16, 2023 at 2:49?AM Ivan Krylov <krylov.r00t at gmail.com> wrote:...

Dear Ivan, thanks a lot, that is helpful. Still, I feel that default partial matching cripples the functionality of data.frame for larger tables. Thanks again and best regards Hilmar On 12.12.23 13:55, Ivan Krylov wrote: > ? Mon, 11 Dec 2023 21:11:48 +0100 > Hilmar Berger via R-devel <r-devel at r-project.org> ?????: > >> What was unexpected is that in this case was that

...TRUE (great!), but if not, the condition does not evaluate to FALSE. ex): if( grep("hi", "hop", fixed = TRUE) ) print('yes, your substring is in your string') else print('no, your substring is not in your string') alternatively, I could replace grep with pmatch: if (pmatch('hi','hop')) print('yes, your substring is in your string') else print('no, your substring is not in your string') The first example, using grep, returns logical(0). The second, using pmatch, returns NA. Any idea how to convert either of those...

On Aug 28, 2009, at 1:53 AM, Daniel Dunbar wrote: > Nice! > > This looks good to me but probably Chris or someone else should sign > off on it. This seems ok to me, please commit. One minor comment: +++ b/lib/Support/Regex.cpp + // Allocate pmatch with at least one element. + pmatch = new llvm_regmatch_t[nmatch > 0 ? nmatch : 1]; + pmatch[0].rm_so = 0; + pmatch[0].rm_eo = String.size(); Can this be a smallvector to avoid a heap allocation on every match? -Chris

Hi, I wonder if there's a good intro to the pattern matching using R? I'm a perl programer and find it too confusing and complex to use regular expressions under R. For instance, why does pmatch("d","ad") returns NULL? How would I call the functions in order to match any portion of the string? Under what circumstances shall backslush be used? I try to extract all strings with ".d", however just couldnt manage to do it? Any ideas? Or I have to write my own rege...

...a-13", dataset, value=TRUE, max.distance=0) [1] "B/10-10-29a-13.cdf" However, I don't want to do this manually for each file on the exclude list - I want to do so for each character string on the exclude list. I am not aware of any list options in agrep specifically, and while pmatch takes a list of a match option, it will not successfully match the partial string: > pmatch(exclude[,], dataset) [1] NA NA NA NA I am still in the process of teaching myself R, so maybe there is something I am missing. I also tried to figure out how to use the recursive apply functionality,...

...following: match.arg("white", colors()) yields 'white', but match.arg("whit", colors()) yields: `Error in match.arg("whit", colors()) : 'arg' should be one of "white", "aliceblue", '... this message actually comes from `pmatch'. using a suitable subset of `colors()' works OK. the precise length were the error occurs seems to depend on `arg' and `choices'. e.g. match.arg("whit", colors()[1:650]) works but the limit seems not be fixed. in another setting it happend around a length of `choices...

...nstall.packages(missingPackages) Now this might be trivial, but, missingPackages includes bundled packages which are already installed (e.g., dse, VR) in addition to those packages that are truly missing. I know I have to match myPackages with the Contains column in CRANsPackages and probably use pmatch to do it, but the syntax eludes me. So, an example: # Install a bundled package install.packages("gregmisc") # Get the installed package matrix myPackages <- installed.packages() # See if gregmisc is really there myPackages[grep("gregmisc", myPackages[,5]),] # Get the m...

...r always fails to match. >>>>> +    //    unless regex was compiled with NEWLINE flag. >>>>> + >>>>> +    bool matches(const char *string, bool notbol=false, bool noteol=false); >>>>> +    bool match_sub(const char *string, llvm_regmatch_t pmatch[], >>>>> +                   unsigned nmatch, bool notbol=false, bool noteol=false); >>>>> >>>>> >>>> These should be doxymented, and I don't understand the flags. Does this mean >>>> that if I *don't* compile with NEWLINE...

Hi all, This occurred in R-2.11.0 (WinXP). The R-help page of .[ says that: "Character indices can in some circumstances be partially matched (see pmatch) to the names or dimnames of the object being subsetted (but never for subassignment). Unlike S (Becker et al p. 358)), R has never used partial matching when extracting by [, and as from R 2.7.0 partial matching is not by default used by [[ (see argument exact)." My understanding is therefor...

...> wrapper(longname = 3) longname = 3 But it fails if I try to use partial argument matching: > wrapper(long=4) Error in lowlevel(longname = 2, long = 4) : unused argument(s) (long ...) because long isn't matched to longname. Is there a reasonable way to do this (e.g. using pmatch or charmatch) other than listing all the low level arguments in the argument list to wrapper? Duncan Murdoch

If you want to use row names to take a row subset of a data.frame then there is a bug when - One row has a name which is a completion of another row name - The shorter name comes after the longer one - You want to retrieve the row with the shorter name An example: R> x <- matrix(1:4, 2, 2, dimnames=list(c("abc","ab"), c("cde","cd"))) R> x cde

...n Windows, the msvc buildbot was all red before my commit, failing here: G:\public\zorg\buildbot\osuosl\slave\clang-i686-xp-msvc9\llvm\include\llvm/Support/IRBuilder.h(133) : error C3861: 'InsertHelper': identifier not found > > +++ b/lib/Support/Regex.cpp > > + // Allocate pmatch with at least one element. > + pmatch = new llvm_regmatch_t[nmatch > 0 ? nmatch : 1]; > + pmatch[0].rm_so = 0; > + pmatch[0].rm_eo = String.size(); > > Can this be a smallvector to avoid a heap allocation on every match? Yes, I changed it to use SmallVector. Best regards, --E...

Hi, I have the following error when building a package * creating vignettes ... ERROR Error: chunk 3 Error in pmatch(x, table, duplicates.ok) : argument is not of mode character Error in buildVignettes(dir = ".") : Error: chunk 3 Error in pmatch(x, table, duplicates.ok) : argument is not of mode character Execution halted I use R-2.0.1 under debian linux 2.6.9 Thanks for any idea P...

the first line of dist() says if (!is.na(pmatch(method, "euclidian"))) shouldn't that be "euclidean" ? --------------------- R version 2.5.1 (2007-06-27) i486-pc-linux-gnu locale: LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_U...

Hi All, I am trying to match two character arrays (email lists) using either pmatch(), match() or charmatch() functions. However the function is "missing" some matches due to differences in the cases of some letters between the two arrays. Is there any way to disable case sensitivity or is there an entirely better way to match two character arrays that have identical ent...