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Questions tagged [lapply]

lapply is a function in R that returns a list of the same length as given argument X, each element of which is the result of applying given function to the corresponding element of X

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deleting an element from all embedded lists in a list in R

I have a list (g) of lists as shown below. To delete element k from one of the embedded lists (ex. 1st list), I can do: g[[1]]$k <- NULL. But when I try to delete element k from all embedded lists, my lapply code fails? Is there a Base R fix? g <-…
rnorouzian
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Is there lapply-like function for S4 object?

To apply a function to all slots in S4. Of course, it can be done with for-loop over slotNames(). But I'm curious if it can be done in a vectorized way.
yuk
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How to run multiple linear regressions with different independent variables and dependent variables adding standardized coefficients in R?

I'm currently trying to run a loop performing linear regression for multiple independent variables (n = 6) with multiple dependent variables (n=1000). Here is some example data, with age, sex, and education representing my independent variables of…
M_Oxford
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Create multiple dataframes by filtering subsets that are not equal to a value in R

I have a dataframe with two columns Text and Colours. library(tidyverse) library(purrr) # sample dataframe df <- data.frame(Text = c("text1", "text2", "text3", "text4"), Colours = c("blue", "white", "green", "yellow"),…
yiah
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Matching pairs in a list of named data.frames in R

Suppose I have 2 lists of named (ex. Study1) data.frames. I want each element d from each data.frame in the 2nd list (k) to be paired with the single corresponding d element in the 1st list (j) for the same data.frame. For example, in the below…
rnorouzian
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How to extract second value from a list of lists and give NA to lists with no second value?

I'd like to extract the first and second values from a list of lists. I was able to extract the first value with no issue. However, it gives me an error when I was trying to extract the second value because not all lists from the suggestion column…
cheklapkok
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Avoid loop with lapply character variable

I would like to use lapply instead of a for loop. It's about to summarize multiple variables to create new ones like ..@3, ...@6, etc. i tried to use noquote to get rid of the "", but i always get the following error message: Error in…
Bier Basti
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R: how to use lapply for monthly data

I have a data set which has the below data: Ticket Feed back Date Month Rating 12345 The resolution was proper 01-01-2019 January 5 12346 The ticket was closed…
AlisonGrey
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How to order models from best to worst based on AIC from the result of lapply in R

Suppose I have following df. ind1 <- rnorm(100) ind2 <- rnorm(100) ind3 <- rnorm(100) ind4 <- rnorm(100) ind5 <- rnorm(100) dep <- rnorm(100, mean=ind1) df <- data.frame(dep,ind1, ind2, ind3, ind4, ind5) I calculated 3rd order polynomial…
R starter
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Create new column that equals one of many existing columns when condition is met

I have a wide dataframe with election results. I need to make a new column saying how many votes a specific party received. The way the votes are recorded means that I need to loop over a large number of columns to do this. I can see how to do it…
lethalSinger
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Applying 'clustering functions' to a series of linear models

I want to iterate over a list of linear models and apply "clustered" standard errors to each model using the vcovCL function. My goal is to do this as efficiently as possible (I am running a linear model across many columns of a dataframe). My…
Thomas Bilach
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How to use multiple functions based on a condition using lapply

I have a question regarding using multiple functions in lapply using a condition. Here is the data frame Data <- data.frame(c(1:6),c(7:12), c(1,0,1,0,1,1), 0) colnames(Data) <- c("a","b","c","d") I want an out put applied to each row based on a…
Kou
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Use lapply on subset of columns with written function?

I have a dataset in which certain columns are dates in character form. The dates are inconsistent in their formatting and missing data are present. I wrote a code to transform them in the correct format. If I use the code for each column with lapply…
MCS
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Number the dataframes within the list (i.e., create a column with an individual number for each dataframe)

I need to be able to distinguish the dataframes within the large list with an individual number, so that I can group_bybased on that number after binding the dataframes (in my case it is impossible to just work with a list without…
aazh
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Subset list of vectors by position in a vectorized way

I have a list of vectors and I'm trying to select (for example) the 2nd and 4th element in each vector. I can do this using lapply: list_of_vec <- list(c(1:10), c(10:1), c(1:10), c(10:1), c(1:10)) lapply(1:length(list_of_vec), function(i)…
Rob Marty
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