• Dirk Eddelbuettel: littler 0.3.13: Moar Goodies

  The fourteenth release of littler as a CRAN package just landed, following in the now fifteen year history (!!) as a package started by Jeff in 2006, and joined by me a few weeks later.

  littler is the first command-line interface for R as it predates Rscript. It allows for piping as well for shebang scripting via #!, uses command-line arguments more consistently and still starts faster. It also always loaded the methods package which Rscript only started to do in recent years.

  littler lives on Linux and Unix, has its difficulties on macOS due to yet-another-braindeadedness there (who ever thought case-insensitive filesystems as a default were a good idea?) and simply does not exist on Windows (yet – the build system could be extended – see RInside for an existence proof, and volunteers are welcome!). See the FAQ vignette on how to add it to your PATH.

• Bash for Loop in One Line

  In any programming or scripting language, the loop is a quintessential feature. Loops are generally to perform a repetitive task until a certain condition is met. Bash is a powerful scripting language that supports all the major features of a scripting language (including loops).

  This guide demonstrates one-line for loops in Bash.

C++

• String Concatenation in C++

  The way to merge two or more strings is called string concatenation. It is a very common task for any programming language. Some programming languages use a specific operator, some programming languages use the built-in function, and some programming languages use both operator and built-in function to combine string values. The string concatenation can be done by using the ‘+’ operator and different types of built-in functions in C++. The uses of the ‘+’ operator and different built-in functions to combine strings in C++ have been explained in this tutorial.

• Passing an Array to a Function C++

  An array is a group of elements of the same data type. Many functions are performed on arrays either in the main program or outside it, in the functions. In C++, in the case of functions, we need to pass them. This is done via parameters as arguments. These arguments can be of different ways, either sizeable arrays or through the pointer array. In this tutorial, we will cover some major aspects of array transfer using different parameters of the functions.

• How to use substr() function in C++

  The way to cut any portion from a string is called a sub-string. The substr() function exists in C++ to generate a new string by cutting a particular portion from a string. The string.h library file is required to include to use this function. This function has two arguments. The first argument contains the starting position of the new string, and the second argument contains the length of the string. The way to use the substr() function in C++ has been explained in this tutorial.

• How to use find_first_of() function in C++

  Different built-in functions exist in C++ to work with the string data. The find_first_of() function is used to find the location of the first occurrence of the specified character. This function returns the position of the first occurrence of the string that will be given as the argument value of this function. Different uses of this function for searching the string in C++ have been explained in this tutorial.

C

• Strstr in C – Linux Hint

  Strstr() in the C language is a built-in function. The functionality of strstr can be understandable through the manual present in the Ubuntu terminal if you are working on Ubuntu. Then the terminal will show you the guide of strstr and how it works.

• Strtok C – Linux Hint

  The C language of programming has a facility to split a string using the function strtok. This is done through a delimiter. It is an easy task that uses a pointer token. A string that is taken as input is divided into small strings called tokens. ‘S’ is the name that indicates that in “strtok”, str stands for the string, and “tok” stands for the token. So this function splits the string into tons of tokens. We have highlighted some examples in this tutorial that will help you out understand this concept.

Python

• Python Increment by 1 – Linux Hint

  When you’re acquainted with Python, you’re probably aware that the Increment and Decrement expressions (both before and after) aren’t supported. Python was created to be understandable and consistent. In linguistics having ++ and — expressions, a beginner programmer frequently makes the mistake of confusing the distinctions among increment/decrement expressions, post and pre (both in priority and return value). In comparison to many other programming languages, basic increment and decrement expressions are not quite as necessary. In this tutorial, we will learn about the increment by 1 operator in Python code. Make sure you must have a python tool installed and configured on your system. Hence, we have installed the Spyder Python tool on our system.

• Python Not Equal Operator – Linux Hint

  While contrasting variables, it’s important to examine both the contents and respective datatypes. Whenever the values of the two inputs differ, the statement is satisfied. Throughout Python, we may use “!=” or “is not” to do not equal operations. Whenever the values of any two Python variables or operands supplied on either side of the not equal operator are not equal, it must return true, else false. Many structured query languages might grumble about matching various types since Python is flexibly yet tightly typed. The not equal operator must return “True” whenever the values provided in two variables are the same; however, they are of various types. Let’s have some examples to see the working of python Not equal operator. First of all, you must ensure that your system has a python tool installed and configured. Launch your installed python tool to start working. At the time of implementing this article, we have been working on the Spyder Python tool.