Programming Articles - Page 850 of 3363

A list may contain vectors, data frames, matrices, lists etc. If a list contains matrices and we want to convert those matrices into vectors then lapply function can be used along with as.vector function.For example, if we have a list called LIST that contains matrices then we can convert those matrices into data frames by using the below given command − lapply(LIST,function(x) as.vector(x))ExampleFollowing snippet creates the matrices −M1

To create a new column with ratio of two columns in an R data frame, we can use division sign.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 then we can use the below given command −df$Ratio_X_Y

To find the number of times a variable changes its sign in an R data frame column, we can use sign function with diff and sum function.For example, if we have a data frame called df that contains a column say C then, we can find the number of times C changes its sign by using the following command −sum(diff(sign(df$C))!=0)Example 1Following snippet creates a sample data frame −x

We can upload files using Selenium Webdriver. This is achieved by the sendKeys method. We have to first identify the element which performs the file selection by mentioning the file path [to be uploaded].This is only applied to an element having a type attribute set to file as a value along with the element tag name as input. The below html code shows the element with type = file value set.ExampleCode Implementation.import org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; import java.util.concurrent.TimeUnit; public class WndsFileUpl{    public static void main(String[] args) {       System.setProperty("webdriver.chrome.driver",       "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");   ... Read More

We can work with Selenium webdriver with Java Quickstart template. This can be done by following the below steps −Step1− Click on the File menu in Eclipse. Then select the option New. Next click on Other.Step2− Click on Maven Project from the Maven folder. Then click on Next.Step3− Proceed with the further steps.Step4− Select maven-archetype-quickstart template. Then click on Next.Step5− Add GroupId as Selenium, Artifact Id as Automation-Selenium, and proceed.Step6− A project should get created with an archetype project structure. The Selenium-related scripts should be written within the src/test/java folder.

We can run Javascript in Selenium webdriver with Python. The Document Object Model communicates with the elements on the page with the help of Javascript. Selenium executes the Javascript commands by taking the help of the execute_script method. The commands to be executed are passed as arguments to the method.Some operations like scrolling down in a page cannot be performed by Selenium methods directly. This is achieved with the help of the Javascript Executor. The window.scrollTo method is used to perform scrolling operation. The pixels to be scrolled horizontally along the x-axis and pixels to be scrolled vertically along the ... Read More

We can run tests using a test runner file for Cucumber. The test runner file should contain the path of the feature file and step definition file that we want to execute.Code Implementation of the Feature fileFeature − Login ModuleScenario − Welcome Page Login verificationGiven User is on Welcome PageThen Welcome page should be displayedExampleCode Implementation of step definition filepackage stepDefinations; import io.cucumber.java.en.Given; import io.cucumber.java.en.Then; public class stepDefination {    @Given("^User is on Welcome Page$")    public void user_on_welcome_page() {       System.out.println("User on welcome page");    }    @Then("^Welcome page should be displayed$")    public void verify_user_on_welcome_page() {   ... Read More

We can create a test runner file for Cucumber. This can be done using the below steps −Step1− Click on the File menu in Eclipse. Then select the option New. Next click on Other.Step2− Click on Maven Project from the Maven folder. Then click on Next.Step3− Proceed with the further steps.Step4− Select maven-archetype-quickstart template. Then click on Next.Step5− Add GroupId as Automation, Artifact Id as Cucumber, and proceed.Step6− A project should get created with a Cucumber-type project structure. The Cucumber-related scripts should be written within the src/test/java folder.Step7− Create a new package called cucumberOptions inside the src/test/java folder.Step8− Create a ... Read More

We can auto-generate a step definition file to a feature file in Cucumber. This can be done by using the Tidy Gherkin plugin which is available as a Chrome extension.Step1− Navigate to the below link to access the Tidy Gherkin plugin.https://chrome.google.com/webstore/detail/tidygherkin/ nobemmencanophcnicjhfhnjiimegjeo?hl=en-GBStep2− Then click on the Add to Chrome button.Step3− Once done, enter chrome://apps/ in the browser. The Tidy Gherkin plugin should be visible.Step4− Click on it to launch it.Step5− Copy and paste the feature file that we want to map to a step definition file within the edit box that has the Enter your Gherkin here…. Then click on ... Read More

We can map a step definition file to a feature file in Cucumber. This can be done using the below steps −Step1− Create a feature file with .feature extension(say Login.feature) with the following −Feature − Login ModuleScenario − Welcome Page Login verificationGiven User is on Welcome PageThen Welcome page should be displayedStep2− Create a step definition java file(say stepDefination.java) having the mapping of the step definition file to the feature file.Examplepackage stepDefinations; import io.cucumber.java.en.Given; import io.cucumber.java.en.Then; public class stepDefination { @Given("^User is on Welcome Page$") public void user_on_welcome_page() { ... Read More