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By Andrie de Vries, Joris Meys. When using R, sometimes you need your function to do something if a condition is true and something else if it is not.
An if…else statement contains the same elements as an if statement see the preceding sectionand then some extra:. A second block of code, contained within braces, that has to be carried out if and only if the result of the condition in the if statement is FALSE. In some countries, the amount Dance 2 Da Beat - Various - Toolkit Vol 12 - Toolkit Allstars value added tax VAT that has to be paid depends on whether the client is a public or private organization.
Imagine that public organizations have to pay only 6 percent VAT and private organizations have to pay 12 percent VAT. You can add an extra argument public to the priceCalculator function and adopt it as follows to add the correct amount of VAT:. If you send this code to the console, you can test the function.
For example, if you worked for 25 hours, the following code gives you the different amounts you charge for public and private organizations, respectively:. If you look at the if…else statement in the previous function, you find these elements. If the value of the argument public is TRUEthe total price is calculated as 1. Otherwise, the total price is 1. The if statement needs a logical value between the parentheses. Mikki Kauste - Onnellinen (File), in the case of an if…else statement you can drop the braces if both code blocks exist of only a single line of code.
So, you could just forget about Birds - Line Bøgh - Something Else And Something Else And Something Else Again braces and squeeze the whole if…else statement on a single line. Or you could even write it like this:. Putting the else statement at the end of a line and not the beginning of the next one is a good idea. If you put else at the beginning of the second line, R considers the first line finished and complains. You can put else at the beginning of a next line only if you do so within a function and you source the complete file at once to R.
But you can make this shorter. The if Birds - Line Bøgh - Something Else And Something Else And Something Else Again works like a function and, hence, it also returns a value. As a result, you can assign that value to an object or use it in calculations. So, instead of recalculating net. R will first evaluate the if…else statement, and multiply the outcome by net. The result of this is then assigned to tot.
This differs not one iota from the result of Intruth (Demo Version) - Claustrofobia - Peste five lines of code we used for the original if…else statement.
Related Book R For Dummies.
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