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  3. Introduction to Writing Functions in R

Exercise

Converting areas to metric 2

You're almost there with creating a function to convert acres to hectares. You need another utility function to deal with getting from square yards to square meters. Then, you can bring everything together to write the overall acres-to-hectares conversion function. Finally, in the next exercise you'll be calculating area conversions in the denominator of a ratio, so you'll need a harmonic acre-to-hectare conversion function.

Free hints: magrittr's raise_to_power() will be useful here. The last step is similar to Chapter 2's Harmonic Mean.

The three utility functions from the last exercise (acres_to_sq_yards(), yards_to_meters(), and sq_meters_to_hectares()) are available, as is your get_reciprocal() from Chapter 2. magrittr is loaded.

Instructions 1/3

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  • 1

    Write a function to convert distance in square yards to square meters. It should take the square root of the input, then convert yards to meters, then square the result.

  • 2

    Write a function to convert areas in acres to hectares. The function should convert the input from acres to square yards, then to square meters, then to hectares.

  • 3

    Write a function to harmonically convert areas in acres to hectares. The function should get the reciprocal of the input, then convert from acres to hectares, then get the reciprocal again.