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  3. Introduction to Writing Functions in R

Exercise

Multiple inputs to functions

If a function should have more than one argument, list them in the function signature, separated by commas.

To solve this exercise, you need to know how to specify sampling weights to sample(). Set the prob argument to a numeric vector with the same length as x. Each value of prob is the probability of sampling the corresponding element of x, so their values add up to one. In the following example, each sample has a 20% chance of "bat", a 30% chance of "cat" and a 50% chance of "rat".

sample(c("bat", "cat", "rat"), 10, replace = TRUE, prob = c(0.2, 0.3, 0.5))

Instructions 1/2

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  • Bias the coin by weighting the sampling. Specify the prob argument so that heads are sampled with probability p_head (and tails are sampled with probability 1 - p_head).