Most voted questions in Data Analytics

0 votes
1 answer

How to wait for a keypress in R?

It is easy by using readline readline(prompt="Press any ...READ MORE

Apr 25, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 2,080 views
0 votes
1 answer

How to remove all variables except functions in R?

One line that removes all objects except for functions: rm(list ...READ MORE

Apr 25, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 4,935 views
0 votes
1 answer

How to set global variables in R

To set global variables, you can use ...READ MORE

Apr 24, 2018 in Data Analytics by kappa3010
 • 2,090 points • 1,749 views
0 votes
1 answer

How do I find out what directory R has chosen to store packages?

.libPaths() // You can use this command ...READ MORE

Apr 24, 2018 in Data Analytics by zombie
 • 3,790 points • 904 views
0 votes
1 answer

Why should I use set.seed function() in R?

set.seed(seed) Set the seed of R‘s random number ...READ MORE

Apr 24, 2018 in Data Analytics by zombie
 • 3,790 points • 2,217 views
0 votes
1 answer

How to import text file as a single character string?

First way: rd<-readChar("temp.txt",file.info("temp.txt")$size) ...READ MORE

Apr 23, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 1,738 views
0 votes
1 answer

How to convert tables to a data frame in R ?

> trial.table.df <- as.data.frame(trial.table) //assuming that trial.table ...READ MORE

Apr 20, 2018 in Data Analytics by zombie
 • 3,790 points • 7,996 views
0 votes
4 answers

How to change font size in R?

To change the font size of text ...READ MORE

Dec 16, 2020 in Data Analytics by Gitika
 • 65,730 points • 126,857 views
0 votes
1 answer

How to prevent row names to be written to a file while using

Easily by: write.csv(df, "temp.csv", row.names=FALSE) READ MORE

Apr 20, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 1,037 views
0 votes
1 answer

How to save a DataFrame in R??

Suppose your DataFrame is named as df: write.csv(df,file="exmp.csv") Then ...READ MORE

Apr 20, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 5,658 views
0 votes
1 answer

How can I import multiple .csv files into R ?

## import_multiple_csv_files_to_R # Purpose: Import multiple csv files ...READ MORE

Apr 20, 2018 in Data Analytics by zombie
 • 3,790 points • 6,588 views
0 votes
1 answer

How to limit output of a dataframe in R?

For randomly sampling a row/cell where a ...READ MORE

Apr 18, 2018 in Data Analytics by kappa3010
 • 2,090 points • 3,977 views
0 votes
1 answer

How to join columns that are non-NA?

You can match on something like X=X ...READ MORE

Apr 18, 2018 in Data Analytics by Sahiti
 • 6,370 points • 1,231 views
0 votes
1 answer

How to find out the package version which is loaded in R?

You can use sessionInfo() to accomplish that. > ...READ MORE

Apr 18, 2018 in Data Analytics by zombie
 • 3,790 points • 1,151 views
0 votes
1 answer

How can we trim leading and trailing whitespaces in R?

trimws {base} //Remove Leading/Trailing Whitespace Removes leading and/or ...READ MORE

Apr 18, 2018 in Data Analytics by zombie
 • 3,790 points • 2,368 views
0 votes
1 answer

Get list of rownames as values after aggregating a dataframe

You can use reshape2 library: library(reshape2) data <- read.table(text="type ...READ MORE

Apr 17, 2018 in Data Analytics by Sahiti
 • 6,370 points • 1,110 views
0 votes
1 answer

Reshape data from long to wide format

You can use the reshape function reshape(data, idvar ...READ MORE

Apr 17, 2018 in Data Analytics by nirvana
 • 3,090 points • 1,123 views
0 votes
1 answer

How to drop factor levels in a subsetted data frame?

You can use factor(ff) to drop levels ...READ MORE

Apr 17, 2018 in Data Analytics by kappa3010
 • 2,090 points
edited Apr 17, 2018 by kappa3010 • 5,944 views
0 votes
1 answer

Is there any way to check for missing packages and install them in R?

There are 2 options: Either you can use ...READ MORE

Apr 17, 2018 in Data Analytics by nirvana
 • 3,090 points • 1,233 views
0 votes
1 answer

Plot two variables as lines on the same graph using ggplot

If you have small number of variables, ...READ MORE

Apr 17, 2018 in Data Analytics by kappa3010
 • 2,090 points • 5,419 views
0 votes
1 answer

Unload a package without restarting R

Try the below option: detach("package:vegan", unload=TRUE) NOTE: You can ...READ MORE

Apr 17, 2018 in Data Analytics by DataKing99
 • 8,250 points • 4,569 views
0 votes
1 answer

Check if the object(variable) is defined in R

You can use the exists(): > exists("toFindUnknown") [1] FALSE > ...READ MORE

Apr 17, 2018 in Data Analytics by Sahiti
 • 6,370 points • 1,114 views
0 votes
1 answer

How to check if a directory exists and how to create and create if doesn't exist?

You can use showWarnings = FALSE NOTE:  showWarnings ...READ MORE

Apr 17, 2018 in Data Analytics by DataKing99
 • 8,250 points • 3,109 views
0 votes
1 answer

Find length of string in R

You can try nchar > nchar("fast") [1] 4 > set.seed(10) > ...READ MORE

Apr 17, 2018 in Data Analytics by DataKing99
 • 8,250 points • 1,654 views
0 votes
1 answer

Read command line parameters from an R script

Here's an example to explain : Two files ...READ MORE

Apr 17, 2018 in Data Analytics by kappa3010
 • 2,090 points • 4,041 views
0 votes
1 answer

How can I measuring running time of R Code ?

5 ways to measure running time of ...READ MORE

Apr 17, 2018 in Data Analytics by anonymous
 • 13,188 views
0 votes
1 answer

How to plot side-by-side Plots with ggplot2 in R?

By Using gridExtra library we can easily ...READ MORE

Apr 16, 2018 in Data Analytics by DeepCoder786
 • 1,720 points
edited Jun 9, 2020 by MD • 9,341 views
0 votes
3 answers

How to write lines to a text file in R?

sink("outfile.txt") cat("hello") cat("\n" ...READ MORE

May 24, 2019 in Data Analytics by anonymous
 • 19,806 views
0 votes
1 answer

Save a plot as image on the disk using R

Consider for both the situations: 1. Image will ...READ MORE

Apr 14, 2018 in Data Analytics by Sahiti
 • 6,370 points • 2,608 views
0 votes
1 answer

How to install an R package from source?

If you have your file located locally ...READ MORE

Apr 14, 2018 in Data Analytics by CodingByHeart77
 • 3,750 points • 1,330 views
0 votes
1 answer

Concatenate 2 strings in R

You can use the paste() command: You can ...READ MORE

Apr 14, 2018 in Data Analytics by Sahiti
 • 6,370 points • 1,578 views
0 votes
1 answer

Any built-in function to find mode

You can try out the below code ...READ MORE

Apr 14, 2018 in Data Analytics by kappa3010
 • 2,090 points • 927 views
0 votes
2 answers

R function for finding the index of an element in a vector?

The function match works on vectors : x <- sample(1:10) x # ...READ MORE

Dec 12, 2020 in Data Analytics by Rajiv
 • 8,870 points • 57,328 views
0 votes
1 answer

Rename a single column in dataframe using R

colnames(Samp)[2] <- "newname2" This sets the name of ...READ MORE

Apr 13, 2018 in Data Analytics by kappa3010
 • 2,090 points • 2,575 views
0 votes
1 answer

How to create an empty dataframe?

Initialize with empty vectors: data <- data.frame(Date=as.Date(character()), ...READ MORE

Apr 13, 2018 in Data Analytics by nirvana
 • 3,090 points • 1,779 views
0 votes
1 answer

How to create dummy variables based on a categorical variable of lists in R?

You can use mtabulate in the following way: library(qdapTools) cbind(data[1], ...READ MORE

Apr 13, 2018 in Data Analytics by CodingByHeart77
 • 3,750 points • 3,091 views
0 votes
2 answers

How to remove rows with missing values (NAs) in a data frame?

Hi, The below code returns rows without ...READ MORE

Aug 20, 2019 in Data Analytics by anonymous
 • 33,050 points • 15,322 views
0 votes
1 answer

Sample random rows in DataFrame in R

First we should have some data: df1<-data.frame(matrix(rnorm(20), nrow=10)) > ...READ MORE

Apr 13, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 8,579 views
0 votes
1 answer

.SD in data.table in R

.SD stands for "Subset of Data.table". The ...READ MORE

Apr 13, 2018 in Data Analytics by nirvana
 • 3,090 points • 7,495 views
0 votes
1 answer

Working of ggplot scale_continuous 'expand' argument

According to the document if you set limits manually, ...READ MORE

Apr 13, 2018 in Data Analytics by DataKing99
 • 8,250 points • 4,001 views
0 votes
1 answer

What is the difference between [] and [[]] notations to access the elements of a list or dataframe in R?

R provides 3 basic indexing operators. Refer ...READ MORE

Apr 12, 2018 in Data Analytics by kappa3010
 • 2,090 points • 3,443 views
0 votes
1 answer

How to find out the sum/mean for multiple variables per group in R?

You can use the reshape2 package for ...READ MORE

Apr 12, 2018 in Data Analytics by DataKing99
 • 8,250 points • 4,355 views
0 votes
1 answer

How to convert a list to data frame in R?

Let's assume your list of lists is ...READ MORE

Apr 12, 2018 in Data Analytics by nirvana
 • 3,090 points
edited Apr 12, 2018 by nirvana • 22,544 views
0 votes
1 answer

How to merge data frames using joins?

You can use the merge function with ...READ MORE

Apr 12, 2018 in Data Analytics by kappa3010
 • 2,090 points • 1,454 views
0 votes
1 answer

How to group all columns exculding a single column?

You can either use group_by or group_by_at Using ...READ MORE

Apr 12, 2018 in Data Analytics by Sahiti
 • 6,370 points • 4,004 views
0 votes
2 answers

How to use group by for multiple columns in dplyr, using string vector input in R?

data = data.frame(   zzz11def = sample(LETTERS[1:3], 100, replace=TRUE),   zbc123qws1 ...READ MORE

Aug 6, 2019 in Data Analytics by anonymous
 • 14,678 views
0 votes
1 answer

How to join a list of data frames using map()

You can use reduce set.seed(24) r1 <- map(c(5, 10, ...READ MORE

Apr 11, 2018 in Data Analytics by kappa3010
 • 2,090 points • 2,067 views
0 votes
1 answer

How to apply list to a function which give data frame as output

If you use  tidyverse, you can use ...READ MORE

Apr 11, 2018 in Data Analytics by Sahiti
 • 6,370 points • 1,276 views
0 votes
1 answer

How to extract specific columns from a DataFrame ?

Yes there are so many ways: df[,c(V2,V4)] and another ...READ MORE

Apr 11, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 9,046 views
0 votes
1 answer

How to drop data frame columns by name?

Easily you can do it: drops <- c("V2","V4") df1[ ...READ MORE

Apr 10, 2018 in Data Analytics by DeepCoder786
 • 1,720 points • 1,142 views
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