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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create a horizontal bar plot using barplot function in R?
To create a bar plot in base R, we can directly use barplot function but the table of frequencies should be passed inside this function. If we want to create the barplot in horizontal manner then horiz=TRUE argument must be added. For example, if we have a vector x that contains repeating values then the horizontal bar plot of x can be created by using barplot(table(x),horiz=TRUE).Example1> x barplot(table(x),horiz=TRUE)OutputExample2> y barplot(table(y),horiz=TRUE)OutputExample3> z barplot(table(z),horiz=TRUE)Output
Read MoreHow to create a subset of a data frame in R without using column names?
The subsetting of a data frame can be done by using column names as well as column number. Also, we can subset by subsequent as well as non-subsequent column numbers. For example, if we have a data frame df that contains column x, y, z then we can make a subset of x and z by using df[, c(1, 3)].ExampleConsider the below data frame:> set.seed(191) > x1 x2 x3 x4 df1 df1Output x1 x2 x3 ...
Read MoreHow to create a line that passes through specified points in an R plot?
To create a line that passes through specified points, we first need to create the plot then using plot function then xspline function can be used to join the points with straight lines. The xspline function is specifically designed to draw curves and hence it can be also used to join points in a plot as shown in the below examples.Example1> plot(rpois(10,5)) > xspline(c(4,3,1),c(7,5,2))Output:Example2> plot(rnorm(10)) > xspline(c(4,3,1),c(0.3,-0.5,-1.5))Output:
Read MoreHow to create two 3d plots at a time in R?
The rgl package is specifically designed to create real-time interactive 3D plots and we can create two 3d plots using plot3d function of this package. Also, these plots can be viewed in the R console at a single point of time with the help of open3d() function.ExampleLoading rgl package:Example> library(rgl) > x y z plot3d(x,y,z)OutputExample> open3d() wgl 12 > plot3d(x,y,z,col=rainbow(5))Output
Read MoreHow to display the superscript for a single variable in a base R plot?
To display the superscript in a base R plot, we would need to use expression function inside text function. For example, if we want to display X-square inside a blank plot in base R then we can use the below code:plot(1:10,type="n") text(2,2,expression(X^2))Example1> plot(1:10,type="n") > text(2,2,expression(X^2==4))Output:Example2> text(5,5,expression(X^5==Center))Output:Example3> text(9,9,expression(Squared^2))Output:
Read MoreHow to create a sphere in R?
To create a sphere, we can use spheres3d function of rgl package. The rgl package is specifically designed to create real-time interactive 3D plots. If we want to create a sphere then we need to pass the values for the three axes and the radius of the sphere. We can also change the color of the sphere by introducing color argument inside spheres3d function.Example1Loading rgl package and creating a sphere:> library(rgl) > spheres3d(x=1,y=1,z=1,radius=1)Output:Example2> spheres3d(0,0,0,radius=1,color="blue")Output:Example3> spheres3d(0,0,0,radius=1,color="red")Output:
Read MoreHow to set the line breakpoint in the PowerShell?
To set the line breakpoint in the script, we can use the Set-PSBreakpoint command with -Line parameter and need to give the path of the script on which the Line breakpoint needs to set.Consider we have the script below which retrieves the value up to 99, starting from 1, We will set the Line Breakpoint at line number 3 so we will use the below command. Here the script name is WhieScript.ps1 and stored at C:\temp.Set-PSBreakpoint C:\temp\WhileScript.ps1 -Line 3Once you run the above command, you will get the output with the details as shown below.ID Script Line Command Variable ...
Read MoreWhat is the breakpoint in PowerShell?
Breakpoint in the PowerShell is the part of the debugger in the PowerShell commands. We use the breakpoints in PowerShell mainly for troubleshooting and logging purpose.There are three ways to set the breakpoint in PowerShell.Line BreakPoint (Can set the breakpoint for single or multiple lines)Command BreakPoint (Can set the breakpoint for commands or functions)Variable Breakpoint (Can set the breakpoint on a variable or multiple variables).We can’t set the breakpoint for the remote computer. To set the breakpoint for the remote computer, we first need to copy the script to the remote computer and then need to set the breakpoint as ...
Read MoreHow to check if the file is empty using PowerShell?
To check if the file is empty using PowerShell, we can use the string method called IsNullorWhiteSpace(). This method provides result true if the file is empty or only contains the white spaces otherwise false.For example, We have a test2.txt text file which has whitespaces.Example[String]::IsNullOrWhiteSpace((Get-content C:\Test2.txt))OutputTrueBut if you have a file like CSV which contains few headers but the data is empty, in that case, Get-Content will show the wrong output because it will consider headers. For example, Example[String]::IsNullOrWhiteSpace((Get-content C:\Temp\NewUsers.csv))OutputFalse Because the file has headers.PS C:\> Get-Content C:\Temp\NewUsers.csv Name, FirstName, Surname, EMPNumber, CountryIn that case, we can use the Import-CSV ...
Read MoreHow to open any file with its default application with PowerShell?
To open any file using its default application, we can use the Invoke-Expression command. For example, we want to open a file on the C:\temp and the file name is NewUsers.CSV then you can run the below command.Invoke-Expression C:\Temp\NewUsers.csvThe above command will open the file from that location. If the default application is not set then Windows will ask for the default application to select.If you know any application name and which can be opened with the shortcut then you can directly type the name of the application. For example, Notepad.exe, Calc.exeGenerally, they can be opened directly but this command ...
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