Questions tagged [r]
R is a free, open source programming language and software environment for statistical computing and graphics.
395
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R: Function to return the category that has the maximum in another variable [closed]
Is there a nice simple function to return which diet has the highest average? I can calculate the means from each diet using:
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Extract, transform, and load Excel files
I am curious to know if there is a cleaner/better way to write this. Any suggestions would be greatly appreciated! I do ask some questions in comments within the code specific to certain functions/...
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R code to calculate coef
Can you help me think of some way to reduce the computational time of a code that generates a certain value, which in this case I call coef, which will depend on <...
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Adjust code that uses data.table function
The idea of this code below is to find the coef value for each date/category. To find the value of ...
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0
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Another solution approach to find if trailing zeros exist for each row id
The code below removes trailing zeros exist for each row id.
This question has been resolved here https://stackoverflow.com/questions/69452882/delete-column-depending-on-the-date-and-code-you-choose. ...
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calculating all prime numbers up to a given number
This program calculates all prime numbers up to n. However it runs pretty slowly.
I was wondering if there was any optimisations I could make.
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Mapping variables in two data frames using a third data frame
I have two data frames, df1 and df2 of identical structure. The first three columns, id, <...
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32
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0
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1
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A function that modifies the column types of a `data.frame`, given a character vector of "format codes"
Problem
A business process requires me to read two different text files (raw and processed) into R as data.frames, with each column being read as a character type. ...
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1
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How can I simplify the code using just the tidyverse?
So I have the data frame below, and I'm trying to creat a new Data frame which show me the name of the department which have the highest and the lowest employee turnover. The code that I write is ...
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Faster way to print Number of Descents in a permutation in R
I am trying to find a more efficient way to print the number of descents in a permutation using R as my programming language. This code does it for the numbers 3 to 10:
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R language optimize converting mpfr to gmp
I wrote a function to convert, without loss of precision, a mpfr - class value to a gmp bigq value. (This particular operation ...
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1
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Conditionally drop rows in grouped data.frame using dplyr in R
I have a data frame with columns for three predictors that try to predict the target variable 'change' with values 'yes' and 'no'. The data frame is grouped by id, and for every id, I have 4 years.
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How can I make this code more efficient
i try to get the row count for last three column (Kindly refer the below image ).I have done using for loop but the concern is it takes so much of time to execute in my application, and i heard apply ...
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2
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49
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Assign 0 or 1 with different probabilities conditional on another column in R
I am trying to assign a 0 or 1 with some stochasticity based on another column in a data frame (outcome). If outcome == 1, the ...
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0
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55
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Estimating risk differences for marginal models
I need to estimate risk differences for marginal models. I have worked on the Probratio function to create an equivalent function for RDs that works.
Please provide feedback on accuracy or comments to ...
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Printing file archives using R and libarchive
This is my first formal R script that reads an archive and prints its contents. It uses libarchive R-bindings, which can be ...
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106
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R ggplotly with hovermode = "x unified"
I managed to get this ggplotly graphic:
It uses the layout option hovermode = "x unified" (see https://plotly.com/r/...
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Combine several calculations on several variables
This is my very first time here, I am coming from stackoverflow.com thanks to @r2evans.
So I apologize in advance if I don't follow all the rules.
I wrote a code in ...
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Increase speed of lapply function identifying the sum of all existing combinations
I have a dataframe of cases that score 0-1 on a group of binary attributes.
What I want to do is extract all possible ombinations of attribute triplets (e.g. A/B/C, A/B/D... out of A-E) and then sum ...
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25
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2
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1
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Simulating disease spread in a population
I am trying to build a model that allows me to estimate the spread of disease in the population. The setup is similar to the SIR model, with the difference that this model includes the stochastic ...
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1
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An efficient way for removing rows with zero elements iteratively while constructing the matrix
Based on a previous post, Accelerating creation of matrices and finding ways for optimal scaling, we managed to accelerate the way that I construct a matrix in Rcpp (inputs for example are at the end ...
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R code that creates stellar interior light curves
Here is a minimal example of my task...
I have four 2-column files. profile1.data
...
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1
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50
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R code for reading tabular data files and plotting light curves of modeled stars
Here is a minimal example of my task...
I have four 2-column files. profile1.data
...
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1
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R code for reading tabular data files and plotting light curves of modeled stars
I am given a file named profile1.data that looks like this:
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0
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65
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R Count rowwise missing values for specific columns - dplyr cleanest version
I want to count the missing values for each case in different sets of variables in a bigger dataset. Lets say in the mtcars between the variable disp and the ...
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1
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Accelerating creation of matrices and finding ways for optimal scaling
I have the following specific task, for which I have written code, in Rcpp, but it doesn't scale well and I would like to improve it. I'll describe first the steps of the procedure
Step 1:
We have ...
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R coding: creating a name variable to use with select
I am wondering if this is correct:
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55
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2
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1
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Find if a dataset of words contains any words containing all vowels by using exactly 5 calls to str_detect
Take the words dataset from stringr. An R4DS exercise challenges the reader to check if there are any words in that dataset that ...
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using R probability
I am working on the subject of the French championship 2019, composed of 20 teams, and each team plays 38 times, if team A plays with team B, whatever the result, each team plays another time with ...
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Rcpp sparse CSC matrix class
This is a sparse matrix (dgCMatrix) class that extends Rcpp.
WHAT: This class includes Rcpp::NumericVector and ...
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R Container for Multiple data.frame with a Brief Description of the Content of the data.frame
For a project I have a large dataset with a multitude of variables from different questionnaires. Not all variables are required for all analyses.
So I created a preprocessing script, in which subsets ...
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2
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77
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Algorithm that creates in a systematic form, matrix with zero-one elements
I'm working on Rcpp and I wrote the following code
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Reimplemented R function(s) is surprisingly slow
I reimplemented the functions https://rdrr.io/cran/fclust/man/RI.F.html, https://rdrr.io/cran/fclust/man/ARI.F.html and https://rdrr.io/cran/fclust/man/JACCARD.F.html of the R package https://rdrr.io/...
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Speed up a function that checks for a sequence
I created a function yes.seq that takes two arguments, a pattern pat and data dat, the ...
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73
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Search rows in dataframe corresponding to a value in R - Performance & Scalability
Overview of the Question
I would like to ask for performance/scalability feedback on an R function that I recently wrote. I have a large 4-column dataframe (the <...
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1
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Calculating edges of a social network
I am working on an open Chess data-set (~15500 rows after cleaning), and I create nodes and edges. But the way I create the edges takes a bit of time.
A sample of my nodes tibble:
player
1
bougris
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Was this an idiomatic and prudent way to extend R's matrix multiplication syntax? Should I have used R's object system?
After reading one too many Lisp books, I decided to try extending R's syntax. My goal was to implement repeated matrix multiplication in a way such that I could write ...
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Dplyr friendly function for computing moving average
Background
The function computes moving arrange and offers some other minor widgets like possibility to return data frame in original order or automatically derive variable name for the moving average....
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1
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How can I strengthen this function? I want it to give me an estimated date of hearing back from grad school applications
I created a function to give me an estimated date of hearing back from grad school applications using the median length of days between each theGradCafe submission and January 1st. I separated ...
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How to make my code with for/if loop more efficient in R
My code is structured so that I create an ellipse through my first three points of data. Then I go through each next row, and if the point falls outside the ellipse, I record the minimum distance ...
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Implemented my own version of every() from {purrr}
I am new to programming / R and new to writing functions. I am working through the book ...
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1
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59
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Construct list from a dataframe and a formula
A dataframe and a right-sided formula are given:
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1
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Unefficent data wrangling in R
so I've been working with R quite a while now, but due to very stressful deadlines in my last university module I had, I wrote code that I'm not very proud of. I would like to be more efficient in ...
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1
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Writing an excel doc with a subset of my data in R. Currently the code is excessively long
I'm fairly new to R. I have used the 'r2excel' package to create an excel workbook from a subset of my R data. This should have 3 sheets for the three different subsets. What I have written works fine,...
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normal distribution line does not show up when plotting [closed]
I am plotting a distribution of 10,000 samples of sum of 100 poisson variables, and overlaying that distribution of the approximate normal distribution. However, the normal distribution line does not ...
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Does this R code look ok to expand out to other sites?
I'm after some constructive criticism on my code and maybe some ways to simplify before I expand it to include other sites. I am new to R and coding and have been working on this problem for weeks now....
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transform columns to binary encoded columns in R
I have some nominal variables encoded as integers (not ordinal), which I would like to encode as binary (not dummies nor one hot!). The following code is what I came up with (adapted from other code I ...
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