Modern R Programming Cookbook

Handling exceptions and error messages

Whenever you are creating a function, there could be a conditional statement or even some mathematical operation that might not be executable for all situations. For example, if you are transforming a numeric vector into logarithms, then a negative value will give an error. In this recipe, you will learn how to handle exceptions and errors and/or warnings while you write your own customized functions. There are several functions in R to handle exceptions/errors/warnings as follows:

• warning(): This function can generate a warning message
• stop(): This function can generate an error message
• supressWarnings(expr): This function evaluates the expression inside the function and then ignores warnings if there ...