Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create a bar plot in R filled with color palette in RColorBrewer package?
To create a bar plot in R filled with color palette in RColorBrewer package, we can follow the below steps −First of all, create a vector.Create the bar plot with color palette in RColorBrewer package.Example 1Let's create a vector as shown below −x
Read MoreHow to create facetted histograms using ggplot2 in R?
The facetted histograms are the separated histograms created for different categories in a single plot window. We can follow the below steps to create such type of histograms using ggplot2 −First of all, create the data frame.Load the ggplot2 package and create facetted histogram with the help of facet_grid function of ggplot2 package.Create the data frameLet's create a data frame as shown below −Group
Read MoreHow to remove interaction from regression model in stargazer in R?
To remove interaction from regression model in stargazer in R, we can follow the below steps −First of all, create a data frame.Then, create a regression model using stargazer.After that, create the regression model with stargazer without interaction terms.Create the data frameLet's create a data frame as shown below −x1
Read MoreHow to find the row sums by excluding a column in R data frame?
Suppose we have a numerical column in an R data frame that we do not want to include our analysis due to some characteristics such is similarity or distinction with the rest of the data then we might want to exclude that column from the analysis. One such situation would be finding the row sums by excluding a column. For this purpose, we can use the below steps −First of all, creating a data frame.Finding the row sums with the help of mutate function of dplyr package and setdiff function in base RCreate the data frameLet's create a data frame ...
Read MoreHow to create the combination of rows in two data frames having same columns in R?
To create the combination of rows in two data frames having same columns in R, we can follow the below steps −First of all, create two data frames.Then, combine the rows in the data frames with expand.grid and cbind with do.call.Create the data framesLet's create a data frame as shown below −Class
Read MoreHow to replace NAs with non-NA if there is only one non-NA in R data frame based on another column?
If we have only one non-NA value in an R data frame column and a column that is categorical then we might want to replace the NAs with the given non-NA. For this purpose, we can follow the below steps −First of all, creating a data frameThen replacing the NA with non-NA with the help of min function of base R and mutate function of dplyr package.Create the data frameLet's create a data frame as shown below −Grp
Read MoreHow to combine multiple columns into one in R data frame without using column names?
To combine multiple columns into one in R data frame without using column names, we can follow the below steps −First of all, create a data frame.Then, convert the data frame into a single column data frame.Again, convert the data frame into a single column without column names displayed in rows using row.names function.Create the data frameLet's create a data frame as shown below −Examplex
Read MoreHow to test for the difference between two regression coefficients in R?
To test for the difference between two regression coefficients, we can follow the below steps −First of all, creating data frame.Then creating a regression model.After that testing the difference between regression coefficients using LienarHypothesis function of car package.Create the data frameLet's create a data frame as shown below −x1
Read MoreDetermining the User IP Address in Node
Node.js is a completely open source technology that runs on JavaScript runtime environment. When the users want to access a website or link, they connect with the link using their system IP. We can use the dns.lookup() method in Node to find the IP address of the current user.Syntaxdns.lookup(hostname, [options], callback)ParametersThe parameters are described below −hostname − This input parameter consists of the web link which is valid or active.options − Default is 0. It takes input for the IP type, i.e., 4 for Ipv4 and 6 for Ipv6.callback − Handles any error if it occursExample 1Create a file with ...
Read MoreHow to create a line chart using ggplot2 that touches the edge in R?
To create a line chart using ggplot2 that touches the edge we can follow the below steps −First of all, creating data frame.Then loading ggplot2 package and creating the line chart in default manner.After that creating the line chart with coord_cartesian function.Create the data frameLet's create a data frame as shown below −x
Read More