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Articles on Trending Technologies
Technical articles with clear explanations and examples
Find the row means for columns starting with a string in an R data frame.
To find the row means for columns starting with specific string in an R data frame, we can use mutate function of dplyr package along with rowMeans function.For Example, if we have a data frame called df that contains three columns say x1_x2, x1_x3, x1_x2 and we want to find the row means for columns x1_x2 and x1_x3 then, we can use the below command −df%%mutate(X1_Cmbn=select(.,starts_with("x1_")) %% rowMeans())Example 1Following snippet creates a sample data frame −Grp1_x
Read MoreDifferent Participants of Defect Life Cycle
What Exactly is a Defect?A fault or error in an application that restricts the usual flow of the application by mismatching the expected behavior of an application with the real one is referred to as a defect.A defect happens when a developer makes a mistake when developing or constructing an application. When a tester discovers this error, it is referred to as a defect.A tester must thoroughly test an application to identify as many flaws as possible to guarantee that a quality product reaches the consumer. Before going on to the workflow and different phases of the defect, it is ...
Read MoreCurve Fitting Models in Software Engineering
Curve fitting is the process of constructing a curve, or mathematical function, that best fits a set of data points, subject to constraints. Curve fitting can include either interpolation, which requires a precise fit to the data, or smoothing, which involves creating a "smooth" function that approximates fits the data.Regression analysis is a similar topic that focuses on statistical inference problems such as how much uncertainty is present in a curve that is fit to data seen with random errors.Fitted curves can be used to help in data visualization, predict function values when no data is provided, and describe the ...
Read MoreFind the column and row names in the R data frame based on condition.
To find the column names and row names in an R data frame based on a condition, we can use row.names and colnames function. The condition for which we want to find the row names and column names can be defined inside these functions as shown in the below Examples.Example 1Following snippet creates a sample data frame −x1
Read MoreBest Web Application Testing Tools
We use web app testing tools to enhance reliability, reduce turnaround time and to increase ROI (return on investment).ZAPTESTThis software automation tool is used by those organizations who use software operations/development. It is also used by those organizations who are looking to automate their back-office operations or software testing process. ZAPTEST is also used to develop a seamless automation framework.FeaturesAlso used for automated functional and performance testingUsed in RPA (Robotic Process Automation)Offers seamless testingUsed in executing cross-platform (parallel) testingAutomated DevOps (mock-ups)API (Application Programming Interface) testingAutomatic documentationTestpadThis is an easy-to-use manual testing tool used for testing web applications. It is easily ...
Read MoreBest Cross Browser Compatibility Testing Tools
Cross-browser TestingCross-browser testing is a non-functional testing in which we check if the website works as expected when accessed through −Various browser-operating system combination − On commonly used browsers like Firefox, Google Chrome, Microsoft Edge, Safari; on any popular operating system such as Windows, MacOS, iOS, Android, etc.Different devices − Users can access the website through various devices such as smartphones, tablets, desktops, laptops, etc.Assistive Tools − The website supports assistive technologies, e.g., screen readers for differently abled persons.Cross-browser testing involves developing user experience across devices and platforms. With the help of cross-browser testing tools, we can do this efficiently. ...
Read MoreHow to find the groupwise order of values in an R data frame?
To find the groupwise order of values in an R data frame, we can use mutate function of dplyr package along with rank function and grouping will be done with the help of group_by function.For Example, if we have a data frame called df that contains two columns say Group and DV then we can find the groupwise order of DV values by using the command given below −df%%group_by(Group)%%mutate(Order=rank(DV))Example 1Following snippet creates a sample data frame −Group
Read MoreBest Software Testing Services
Software testing services or companies mainly offer QA and software testing solutions to test your software products and also provide control over its development process. They help you build high-quality, competitive software and applications. They make sure that your software offers a smooth user experience.TestlioIt is a modern crowdsourced testing service that manages software testing processes. Testlio is an integration of platform, freelancers, and services that help deliver great user experiences. It is the origin of networked testing, with over twenty testing capabilities – functional, usability, localization, location, and many more. It seamlessly integrates with automated testing to guarantee complete ...
Read MoreDecorator function pattern in Golang
Decorator function pattern is a pattern that is mainly found in Python and JavaScript, but we can also use it in Golang.It is a pattern in which we can add our own functionality over a current function by wrapping it. Since functions in Golang are considered firstclass objects, which in turn means that we can pass them as arguments as we would in the case of a variable.Example 1Let's start with a very simple example to understand the basic case of passing a function as an argument to an already existing function.Consider the code shown below.package main import ( ...
Read MoreExtract columns with a string in column name of an R data frame.
To extract columns with a particular string in column name of an R data frame, we can use grepl function for column names and then subset the data frame with single square brackets.For Example, if we have a data frame called df and we want to extract columns that has X in their names then we can use the command mentioned below −df[grepl("X",colnames(df))]Example 1Following snippet creates a sample data frame −Students_Score
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