Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
To create a colored frame for ggplot2 graph, we can use theme function and set the plot.background argument to different color for rectangular element.For example, if we have a data frame called df that contains two columns say X and Y then we can create point chart between X and Y with blue colored frame of the plot using the below mentioned command −ggplot(df,aes(X,Y))+geom_point()+theme(plot.background=element_rect(colour="blue",size=3))ExampleFollowing snippet creates a sample data frame −x
To add title to regression model using stargazer, we can use title argument inside stargazer function.For example, if we have a model called Reg_Model with Output as text then the title to this model using stargazer can be added by using the below mentioned command −stargazer(Reg_Model,type="text",title="Regression Model between x and y")Example 1Following snippet creates a sample data frame −x
To delete a row from an R data frame if any value in the row is greater than n can be done by using the subsetting with single square brackets and negation operator. We will subset the values that are greater than n and then take the negation of the subset as shown in the below given examples.Example 1Following snippet creates a sample data frame −x1
To find the sum product of two matrix by row in R, we can use rowSums function by passing the multiplication of the matrices.For example, if we have two matrices say Matrix1 and Matrix2 then, the sum product of these two matrices by row can be found by using the following command −rowSums(Matrix1*Matrix2)Example 1Following snippet creates a matrix −M1
We are given a string type variable, let's say, str which will be used to store the source code then calculate the size of the string and pass it to the function. The task is to rearrange the given source code and then print the result.Let us see various input output scenarios for this −Input − string str ="#include using namespace std; int main()" "{ int sum, first, second; sum = first + second; printf(\"%d\", c);" " return 0;}"Output −#include using namespace std; int main(){ int sum, first, second; sum = first + second; printf("%d", ... Read More
To multiply each value in a column by a constant, we can use multiplication sign *.For example, if we have a data frame called df that contains a column say x. Now, if we want to multiply each value in x with 10 then we can use the below mentioned command −df$x
The error invalid xlim value occurs when we incorrectly provide the xlim values, these values are not used in sequence, we just need to provide first and the last value. For Example, if we want to create a point chart of 1 to 5 with xlim having values between -5 to 15 then we can use the command as follows −plot(1:5, xlim=c(-5:15))ExampleAdd the following code to the above command −plot(1:10) OutputIf you execute the above given command, it generates the following Output −Add the following code to the above snippet −plot(1:10) plot(1:10, xlim=c(-15:15)) Error in plot.window(...) : invalid 'xlim' value ... Read More
To extract string vector elements up to a fixed number of characters in R, we can use substring function of base R.For Example, if we have a vector of strings say X that contains 100 string values and we want to find the first five character of each value then we can use the command as given below −substring(X,1,5)Example 1Following snippet creates a sample data frame −x1
To create histogram for discrete column in an R data frame, we can use geom_bar function of ggplot2 package and set the width to 1 also passing same column for x and y in aes.For example, if we have a data frame called df that contains a discrete column say x then the histogram for data in x can be created by using the below given command −ggplot(df,aes(x,x))+geom_bar(stat="identity",width=1)ExampleFollowing snippet creates a sample data frame −x
To create a new column with ratio of two columns based on a condition in an R data frame, we can use division sign with ifelse function.For example, if we have a data frame called df that contains two columns say X and Y and we want to create a new column with ratio of X and Y based on a condition that X is greater than 5 then we can use the below given command −df$Ratio_X_Y5,X/Y,NA))Example 1Following snippet creates a sample data frame −x1