Find index in r

27 May 2015 Sorry if this already exists – I needed something like this today, but couldn't seem to find something that does this without using R.nth and other  Applies a function to the value at the given index of an array, returning a new copy of the get :: String -> Object -> Maybe * const get = R.curry((propName, obj) 

You want to get part of a data structure. languages, when you use negative numbers for indexing in R, it doesn't mean to index backward from the end. Instead  14 Feb 2017 a vector of indices: index of needle string found or an empty matrix if no match found. flag. a character ( "r" for regular expression). 27 May 2015 Sorry if this already exists – I needed something like this today, but couldn't seem to find something that does this without using R.nth and other  Applies a function to the value at the given index of an array, returning a new copy of the get :: String -> Object -> Maybe * const get = R.curry((propName, obj) 

integer-valued index vector, as resulting from which(x)..dim: dim(.) integer vector.dimnames: optional list of character dimnames(.). If useNames is true, to be used for constructing dimnames for arrayInd() (and hence, which(*, arr.ind=TRUE)). If names(.dimnames) is not empty, these are used as column names. .dimnames[[1]] is used as row names. useNames

How to identify the indices of a certain value in a vector - 2 programming examples - match function, which function & %in% operator - Reproducible R code. But, we will get a missing value if we try to index outside the length of a vector: length(c(1:3)) ## [1] 3 c(1:3)[9] ## [1] NA. Positional indices can also involve an R   28 Sep 2006 [R] get index of elements in vector. Dimitris Rizopoulos dimitris.rizopoulos at med. kuleuven.be. Thu Sep 28 17:08:59 CEST 2006. Previous message: [R] get  Another pair of generic functions provides replacing the index or time attribute. Methods are available for "zoo" objects only, see examples below. The start and   indexFindlike, finding values in index that begin like search value (character indices only). Mid level search, mid level search functions return positions in index  An important characteristic of R's vectorization system is that shorter vectors Sometimes you do not have the indices you need, and so you need to find them. You can access an individual element of a vector by its position (or "index"), indicated using square brackets. In R, the first element has an index of 1. To get the 

If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not check the remaining values)  

How can we get index of particular value(element) of array quickly? Given a list of input values in @user_array how can I find their reference in the @all_values  In questo articolo. Definizione; Overload; FindIndex(Predicate); FindIndex( Int32, Predicate<  1 Mar 2011 Instead of having the values it has the indices :) I spent close to an hour to find this line :) And here it is. In all its glory :) sort.int(VECTOR, index.

You want to get part of a data structure. languages, when you use negative numbers for indexing in R, it doesn't mean to index backward from the end. Instead 

14 Feb 2017 a vector of indices: index of needle string found or an empty matrix if no match found. flag. a character ( "r" for regular expression). 27 May 2015 Sorry if this already exists – I needed something like this today, but couldn't seem to find something that does this without using R.nth and other  Applies a function to the value at the given index of an array, returning a new copy of the get :: String -> Object -> Maybe * const get = R.curry((propName, obj) 

Cross Validated is a question and answer site for people interested in statistics, machine learning, data analysis, data mining, and data visualization. It only takes a minute to sign up. Finding the column index by its name in R [closed] In a data frame, I would like to get the column's index by name.

13 Apr 2018 Yes, we can find the index of an element in a vector as follows: > a <- c(3, 2, -7, -3 , 5, 2) > b <- (a==-7) # this will output a TRUE/FALSE vector >  How to identify the indices of a certain value in a vector - 2 programming examples - match function, which function & %in% operator - Reproducible R code. But, we will get a missing value if we try to index outside the length of a vector: length(c(1:3)) ## [1] 3 c(1:3)[9] ## [1] NA. Positional indices can also involve an R  

2 Jan 2013 Therefore, the arma::find function is taking logical values and convert them into index positions. This operation is akin to the process behind R's  17 Feb 2011 R: Given column name in a Data Frame, Get the Index. Had a mental block today trying to figure out how to get the indices of columns in a data  How can we get index of particular value(element) of array quickly? Given a list of input values in @user_array how can I find their reference in the @all_values  In questo articolo. Definizione; Overload; FindIndex(Predicate); FindIndex( Int32, Predicate<  1 Mar 2011 Instead of having the values it has the indices :) I spent close to an hour to find this line :) And here it is. In all its glory :) sort.int(VECTOR, index. It's like find , but emits the index of the found value, not the value itself. findIndex marble diagram. findIndex searches for the first item in the source Observable that  As R is optimized to work with vectors, which(x == v)[[1]] is not so very inefficient. It's one comparison (==) operator applied to all vector elements and one subsetting on the indices (which). That's it. Nothing that should be relevant, as long as you're not running 10.000 repetitions on this function.