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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create a point chart with point size increment based on the position of the point in R?
The cex argument is used to increase or decrease the point size in a point chart created in base R. If we want to create a point chart with points of size in increment manner then we can pass a vector of the same size as the vector for which we want to create the point chart. For example, if we have a vector x that contains 10 elements then cex will be set as cex=1:10.Example1Live Demo> x plot(x, cex=1:10, xlim=c(1, 12), ylim=c(-2, 12))Output:ExampleLet’s have a look at another example:Live Demo> y plot(y, cex=1:10, xlim=c(1, 12), ylim=c(-1, 12))Output:
Read MoreHow to fix the coefficient of an independent variable in R?
While doing the analysis we might know the variation in an independent variable or we might want to understand how other independent variables behave if we fix a certain variable. Therefore, we can fix the coefficient of an independent variable while creating the model and this can be done by using offset function with the coefficient of the variable for which we want to fix the value of the coefficient.ExampleConsider the below data frame:Live Demo> set.seed(854) > x1 x2 y1 df1 df1Output x1 x2 ...
Read MoreHow to create a barplot with gaps on Y-axis scale in R?
If we want to have gaps on Y-axis scale in a barplot then it cannot be done in base R. For this purpose, we can make use of gap.barplot function of plotrix package. The gap.barplot function is very handy, we just need to pass the vector for which we want to create the barplot and the gap values simply by using gap argument.Loading plotrix package:> library(plotrix)Example1Live Demo> x xOutput[1] 2 6 5 4 7 2 5 2 5 2 8 6 8 13 3 5 7 7 5 6> gap.barplot(x, gap=c(2, 4)) ylim 0 11Warning message:In gap.barplot(x, gap = c(2, ...
Read MoreHow to set the diagonal elements of a matrix to 1 in R?
First thing we need to understand is diagonal elements are useful only if we have a square matrix, otherwise it would not make sense to set diagonal elements, this is known to almost all mathematicians but some freshman might get confused because we can create diagonal in a non-square matrix which should not be called a diagonal. In R, we can set the diagonal elements of a matrix to 1 by using diag function.Example1Live Demo> M1 M1Output [, 1] [, 2] [, 3] [, 4] [, 5] [1, ] 1 6 11 16 21 ...
Read MoreHow to create normal quantile-quantile plot for a logarithmic model in R?
How to create normal quantile-quantile plot for a logarithmic model in R?A logarithmic model is the type of model in which we take the log of the dependent variable and then create the linear model in R. If we want to create the normal quantile-quantile plot for a logarithmic model then plot function can be used with the model object name and which = 2 argument must be introduced to get the desired plot.Example1Live Demo> x1 x1Output[1] 4.735737 3.631521 5.522580 5.538314 5.580952 4.341072 4.736899 2.455681 [9] 4.042295 5.534034 4.717607 6.146558 4.466849 5.444437 5.390151 4.491595 [17] 4.227620 4.223362 5.452378 5.690660 5.321716 ...
Read MoreHow to remove multiple rows from an R data frame using dplyr package?
Sometimes we get unnecessary information in our data set that needs to be removed, this information could be a single case, multiple cases, whole variable or any other thing that is not helpful in achieving our analytical objective, hence we want to remove it. If we want to remove such type of rows from an R data frame with the help of dplyr package then anti_join function can be used.ExampleConsider the below data frame:Live Demo> set.seed(2514) > x1 x2 df1 df1Output x1 x2 1 5.567262 4.998607 2 5.343063 4.931962 3 2.211267 ...
Read MoreHow to generate passwords with varying lengths in R?
To generate passwords, we can use stri_rand_strings function of stringi package. If we want to have passwords of varying length then we need to create the passwords using the particular size separately. For example, for a size or length of the password equals to 8, we can use the argument length in the stri_rand_strings function.Loading stringi package:> library(stringi)Example1> stri_rand_strings(n=5, length=8, pattern="[0-9a-zA-Z]") [1] "YkIEDYQz" "t42JCzYO" "rOE9YN8U" "2lu9AonY" "6lDUxScX"Example2> stri_rand_strings(n=20, length=8, pattern="[0-9a-zA-Z]") [1] "glH3ysoX" "X0Sgvg3F" "P3YOePTa" "45GOb2hA" "tLCwszus" "CerCi1ks" [7] "UtFwzrSc" "pG8AJCQX" "NTCdMRHj" "5thI1wKb" "Ic8Rol1Y" "JakWa1Wd" [13] "9AfeXo7T" "SFJVn9XV" "lIRhLbJ9" "DNFyAbkJ" "jV4jJRZk" "IthkzfEU" [19] "talj9nBq" "Nak9Tidh"Example3> ...
Read MoreHow to create EditText accepts Alphabets only in Kotlin?
This example demonstrates how to create EditText accepts Alphabets only in Kotlin.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.kt
Read MoreHow to add a TextView to a LinearLayout dynamically in Android using Kotlin?
This example demonstrates how to add a TextView to a LinearLayout dynamically in Android using Kotlin.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.ktimport android.graphics.Color import android.os.Bundle import android.widget.LinearLayout import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinAp" val linearLayout: LinearLayout = ...
Read MoreWeb Scraping in Android Application using Kotlin?
This example demonstrates how to perform Web Scraping in Android Application using Kotlin.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.ktimport android.os.AsyncTask import android.os.Bundle import android.widget.Button import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import org.jsoup.Jsoup import java.io.IOException @Suppress("DEPRECATION") class MainActivity : AppCompatActivity() { private lateinit var textView: TextView lateinit var button: Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) ...
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