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Questions tagged [names]

"names" (plural) is an attribute of some R objects in the R language

In the scientific software R for statistical computing and graphics, "names" is an attribute of some data objects, like vectors (including lists) and data frames. See ?names for details.

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Access lapply index names inside FUN

Is there a way to get the list index name in my lapply() function? n = names(mylist) lapply(mylist, function(list.elem) { cat("What is the name of this list element?\n" }) I asked before if it's possible to preserve the index names in the lapply()…
Robert Kubrick
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R: losing column names when adding rows to an empty data frame

I am just starting with R and encountered a strange behaviour: when inserting the first row in an empty data frame, the original column names get lost. example: a<-data.frame(one = numeric(0), two = numeric(0)) a #[1] one two #<0 rows> (or 0-length…
cdmihai
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Access and preserve list names in lapply function

I need to access list names inside the lapply function. I've found some threads online where it's said I should iterate through the names of the list to be able to fetch each list element name in my function: > n = names(mylist) > mynewlist =…
Robert Kubrick
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Get the column names of a python numpy ndarray

Let's say I have a data file called data.txt that looks like: TIME FX FY FZ 0 10 5 6 1 2 4 7 2 5 2 6 ... In Python run: import numpy as np myData = np.genfromtxt("data.txt", names=True) >>> print myData["TIME"] [0, 1, 2] The names…
mcragun
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use first row data as column names in r

I have a dirty dataset that I could not read it with header = T. After I read and clean it, I would like to use the now first row data as the column name. I tried multiple methods on Stack Overflow without success. What could be the problem? The…
sstww
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What are all of the allowable characters for people's names?

There are the standard A-Z, a-z characters, but also there are hyphens, em dashes, quotes, etc. Plus, there are all of the international characters, like umlauts, etc. So, for an English-based system, what's the complete set? What about sets for…
Paul W Homer
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How to use reference variables by character string in a formula?

In the minimal example below, I am trying to use the values of a character string vars in a regression formula. However, I am only able to pass the string of variable names ("v2+v3+v4") to the formula, not the real meaning of this string (e.g., "v2"…
Eric Green
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assign headers based on existing row in dataframe in R

After transforming a dataframe, I would like to assign heads/names to the columns based on an existing row. My headers are currently: row.names X2 X3 X4 X5 X6 X7 X8 X9 ... I would like to get rid of that and use the following row as…
user3166363
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Specifying column names in a data.frame changes spaces to "."

Let's say I have a data.frame, like so: x <- c(1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10,1:10) df <- data.frame("Label 1"=x,"Label 2"=rnorm(100)) head(df,3) returns: Label.1 Label.2 1 1 1.9825458 2 2 -0.4515584 3 3 …
Brandon Bertelsen
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Can lists be created that name themselves based on input object names?

It would be very helpful to me to be able to create an R list object without having to specify the names of each element. For example: a1 <- 1 a2 <- 20 a3 <- 1:20 b <- list(a1,a2,a3, inherit.name=TRUE) > b [[a1]] [1] 1 [[a2]] [1] 20 [[a3]] [1]…
Francis Smart
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How to pass dynamic column names in dplyr into custom function?

I have a dataset with the following structure: Classes ‘tbl_df’ and 'data.frame': 10 obs. of 7 variables: $ GdeName : chr "Aeugst am Albis" "Aeugst am Albis" "Aeugst am Albis" "Aeugst am Albis" ... $ Partei : chr "BDP" "CSP" "CVP" "EDU"…
grssnbchr
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what is the difference between names and colnames

I just want to understand if there is a difference between names and colnames when working with data.frame. Both seems to behave the same way. Can I subsitute one by the other?
Manu H
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Naming list elements in R

I've been doing some work with some large, complex lists lately and I've seen some behaviour which was surprising (to me, at least), mainly to do with assigning names to a list. A simple example: Fil <- list( a = list(A=seq(1, 5, 1), B=rnorm(5),…
RobertMyles
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appending to a list with dynamic names

I have a list in R: a <- list(n1 = "hi", n2 = "hello") I would like to append to this named list but the names must be dynamic. That is, they are created from a string (for example: paste("another","name",sep="_") I tried doing this, which does…
Alex
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What is a nested name specifier?

Related to this I want to know what exactly is a nested name specifier? I looked up in the draft but I could understand the grammar as I haven't taken any Compiler Design classes yet. void S(){} struct S{ S(){cout << 1;} void f(){} static…
Glenn
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