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Programming Articles
Page 2126 of 2547
How to convert character column of a matrix into numeric in R?
If we have a matrix that contains character columns and we want to convert a single column to numeric then we first need to convert the matrix into a data frame using as.data.frame function after that as.numeric function can be used to change the particular column to numeric type as shown in the below examples.Example 1Following snippet creates a matrix −M1
Read MoreHow to find the average of a particular column in R data frame?
To find the average of a particular column in R data frame, we can take the help of delta ($) operator.For example, if we have a data frame called df that contains a column x then we can find the average of column x by using the command given below −mean(df$x)Example 1Following snippet creates a sample data frame −x1
Read MoreHow to find the mean of all matrices stored in an R list?
To find the mean of all matrices stored in an R list, we can use sapply function along with mean function. For example, if we have a list called LIST that contains some matrices then the mean of each matrix can be found by using the command given below −sapply(LIST,mean)Check out the below given example to understand how it works.ExampleFollowing snippet creates a list of matrices −M1
Read MoreHow to update single value in an R data frame?
To update single value in an R data frame, we can use row and column indices with single square brackets.For example, if we have a data frame called df that contains two columns and ten rows and if we want to change the fifth value in second column to 10 then we can use the command given below −df[5,2]
Read MoreHow to find the coordinate of a value in an R matrix?
The coordinate of a value in an R matrix is the row and column intersection that is the row and column index for that particular value. This can be found by using which function.For example, if we have a matrix called M that contains value starting from 1 to 20 then we can find the coordinate of value 5 by using the command given below − which(M==5,arr.ind=TRUE)ExampleFollowing snippet creates a matrix −M1
Read MoreWhat is a Pytest framework?
Pytest is a test framework in python. To install pytest, we need to use the command pip install pytest. After installation, we can verify if python has been installed by the command pytest –version. The version of pytest shall be known.Pytest can be used for creating and executing test cases. It can be used in a wide range of testing API, UI, database, and so on. The test file of pytest has a naming convention that it starts with test_ or ends with _test keyword and every line of code should be inside a method that should have a name ...
Read MoreWhat are some of the rules of creating a CSS expression?
There are some rules for creating a CSS expression. The CSS is one of the important locators in Selenium. A customized CSS can be developed with the help of attributes like id, class name, and by the combination of tagname and html attributes.The ways of creating a CSS are listed below −Using a class name html attribute.This will select the web element of that particular class represented by (.)classname.Syntax− driver. find_element_by_css_selector(".name")Here name is the value of the attribute class.Using an id html attribute.This will select the web element of that particular id represented by (#) id.Syntax− driver. find_element_by_css_selector("#search")Here search is ...
Read MoreHow to use regular expressions in a CSS locator?
We can use regular expressions in a CSS locator. We can identify elements by matching their attributes partially with the help of regular expressions. In CSS, there are multiple methods to achieve this. They are listed below −Using the wild character *. This means the string contains our given text.Syntax− driver.find_element_by_css_selector("input[name*='sel']")It will search the input tag which contains the 'name' attribute containing 'sel' text.Using the wild character ^. This means the string starts with our given text.Syntax− driver.find_element_by_css_selector("input[name^='Tut']")It will search the input tag which contains the 'name' attribute starting with 'Tut' text.Using the wild character $. This means the string ...
Read MoreHow to pass more than one header in a request in Rest Assured?
We can pass more than one header in a request in Rest Assured. A web service can accept headers as parameters while making a service call. The headers are represented in a key-value pair.There is more than one way of passing multiple headers in Rest Assured −Passing them in a key-value format using the header method.Syntax Response r = given() .baseUri("https://www.tutorialspoint.com/") .header("header1", "value1") .header("header2", "value2") .get("/about/about_careers.htm");Passing them as a Map using the headers method.Syntax Map m = new HashMap(); m.put("header1", "value1"); m.put("header2, "value2"); Response r = given() .baseUri("https://www.tutorialspoint.com/") .headers(m) .get("/about/about_careers.htm");Passing them as a List using the headers method.Syntax List h ...
Read MoreHow to create a Junit report in Cypress?
We can create a Junit report in Cypress. To install the package for the JUnit report, run the command − npm install cypress-junit-reporter --save-devExampleImplementation in cypress.json{ "reporter": "junit", "reporterOptions": { "mochaFile": "cypress/results/results.xml", "toConsole": true } }If we run multiple tests in a run and wish to have a unique report for individual spec files, we have to add [hash] in the mochaFile parameter in cypress.json.ExampleImplementation in cypress.json to avoid overriding report{ "reporter": "junit", ...
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