![]() Similarly, the other two vectors in the function argument gets recycled to ("even","even","even","even") and ("odd","odd","odd","odd") respectively.Īnd hence the result is evaluated accordingly. In the above example, the test_expression is a %% 2 = 0 which will result into the vector (FALSE,FALSE,TRUE ,FALSE). The vectors x and y are recycled whenever necessary.Įxample: ifelse() function > a = c(5,7,2,9) This is to say, the i-th element of result will be x if test_expression is TRUE else it will take the value of y. This returned vector has element from x if the corresponding value of test_expression is TRUE or from y if the corresponding value of test_expression is FALSE. ![]() ![]() The return value is a vector with the same length as test_expression. The Parameter Condition Definition dialog allows a user to create a test condition and an output for a feature that passes that condition. Here, test_expression must be a logical vector (or an object that can be coerced to logical). Syntax of ifelse() function ifelse(test_expression, x, y) Similar to this concept, there is a vector equivalent form of the if…else statement in R, the ifelse() function. Tested on R versions 3.0.X through 3.3.1 Last update: 15 August 2016. ![]() This vectorization of code, will be much faster than applying the same function to each element of the vector individually. baseR-V2016.2 - Data Management and Manipulation using R. Most of the functions in R take vector as input and output a resultant vector. Vectors form the basic building block of R programming.
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