If there is a match with the case, the corresponding value is the output. When the cases have both case value and output value like, then the expression value is matched against case values. If the cases are values like a character vector, and the expression is evaluated to a number than the expression's result is used as an index to select the case. Section 5.3 starts off by reminding you of the basic structure of the for loop in R, discusses some common pitfalls, and then talks about the related while and repeat statements. There are basically two ways in which one of the cases is selected: 1) Based on Index Section 5.2 dives into the details of if, then discusses the close relatives ifelse() and switch(). If no case is matched, an unnamed case is used.If there is more than one match, the first match element is used.If expression type is a character string, the string is matched to the listed cases.To understand it, we have some key points which are as follows: A switch statement is a little bit complicated. This statement allows a variable to be tested for equality against a list of values. This code is based on the value of the expression. It is a multi-way branch statement which provides an easy way to dispatch execution for different parts of code. The switch statement is used in place of long if statements which compare a variable with several integral values. A switch statement is a selection control mechanism that allows the value of an expression to change the control flow of program execution via map and search.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |