R Exercises | Programming Exercises for Finance in the R Language

Introduction to R: Exercises

9. Loops. We will often want to access all of the elements of a data frame or vector in a sequence. We can do this using a for loop. The basic syntax is given below for printing elements 1 through N in vector X:for (i in 1:N){print(X[j])}.

You are given a vector of simple returns, simple_returns. Use a for loop and the log function to compute and print the log returns.


                                simple_returns <- c(0.05, 0.07, -0.03, 0.10, 0.21, -0.13, 0.12)



                            # Use a loop to compute and print each log return.
                            for (___ in 1:7)
                            {
                              print(___(___[i]+1))
                            }



                            # Use a loop to compute and print each log return.
                            for (i in 1:7)
                            {
                              print(log(simple_returns[i]+1))
                            }


                            test_error()
                            test_function("log", incorrect_msg="Did you use the `log` function to compute the natural logarithm?")
                            success_msg("Well done! Do you know why we looped over the range 1:7? If not, try printing `simple_returns`.")

You can compute the natural logarithm of a number using the log() function.

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