similar to: pmatch inconsistency

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("m", c("mean",

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

Sorry about the odd terminology, but I suspect that my intent might be completely missed had I used "aggregate" or "classify" (each of which appears to have some rather special meanings in statistical analysis and modeling). I have some data about software builds; one of the characteristics of each is the name of the branch. A colleague has generated some fairly interesting

On Wed, 13 Dec 2023 09:04:18 +0100 Hilmar Berger via R-devel <r-devel at r-project.org> wrote: > Still, I feel that default partial matching cripples the functionality > of data.frame for larger tables. Changing the default now would require a long deprecation cycle to give everyone who uses `[.data.frame` and relies on partial matching (whether they know it or not) enough time to

Hi Hilmar and Ivan, I have used your code examples to write a blog post about this topic, which has figures that show the asymptotic time 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).

Hello R Helpers, Business - 64 bit windows 7, R 2.11.1 I am trying to match the character contents of one list, called 'exclude', to those of a second list, called 'dataset' dataset is a list of file names with folder locations, and looks like this when called: > dataset [1] "A/10-10-29a-13.cdf" "A/10-10-29a-14.cdf" "A/10-10-29a-15.cdf"

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

I observed the 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

Hi, Somebody asked me to make sure that all the machines running the in our lab (XP and Linux, both running 2.0) have R installed and that A) All the packages are installed and B) kept up-to-date. Obediently, I began to modify a shared Rprofile so that once a week it checks for new packages and updates to the current version of the installed packages on CRAN. Sounds simple enough. Plus some

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

Given vectors of strings of arbitrary length content <- c("abc", "def") searchset <- c("a", "abc", "abcdef", "d", "def", "defghi") Is it possible to determine the content String set that matches the searchset in the sense of 'startswith' ? This would be a vector of all strings in content that start with

Below is a version of [.data.frame that is faster for subscripting rows of large data frames; it avoids calling duplicated(rows) if there is no need to check for duplicate row names, when: i is logical attr(x, "dup.row.names") is not NULL (S+ compatibility) i is numeric and negative i is strictly increasing "[.data.frame" <- function (x, i, j,

Hi all, Suppose that I've two data frames, a and b say, both containing a column 'id'. While data frame 'a' contains multiple rows sharing the same id, data frame 'b' contains just one entry per id (i.e. a 1 to n relationship). For the ease of modeling I now want to generate a new data frame c, which is basically a copy of data frame 'a' augmented by the values

I'm not sure if the following is a bug or a feature: > jjmat <- array(1:6, c(2,3), list(c('ABC', 'DEF'), c('xyz', 'tuv', 'qrs'))) > jjdf <- as.data.frame(jjmat) > jjmat['AB', ] Error: subscript out of bounds > jjdf['AB',] xyz tuv qrs ABC 1 3 5 > jjmat[, 'tu'] Error: subscript out of bounds

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()

Hello, I'd like to use optim, and give extra arguments to the objective function. The man page says that the '...' should let one do it, but I have a hard time to understand how. Example: x <- 1:10 y <- rnorm(10) cost.f <- function(par, x, y) { A <- par[1] cost <- sum( (log(A*x) - log(y))^2) return(cost) } optim(3, cost.f, x, y) ## returns: Error in pmatch(x,

While doing some performance testing with the new version of pqR (see pqR-project.org), I've encountered an extreme, and quite unnecessary, inefficiency in the current R Core implementation of R, which I think you might want to correct. The inefficiency is in access to columns of a data frame, as in expressions such as df$col[i], which I think are very common (the alternatives of

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 =

Hi, I use rJava and call Java code that uses JVMTI code like this VM vm = VM.getVM(); Universe universe = vm.getUniverse(); CollectedHeap heap = universe.heap(); This code attaches to another JVM and to get its internals. This is legal Java and it works. But when I use rJava to call this code, the call is successfull and it throws an error. I believe there is Java

Hi, A noobie question: I'm simply trying to run a conditional statement that evaluates if a substring is found within a larger string. I find that if it IS found, my function returns 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