Calculating Population Change Over Time with R Q10

Please can someone explain to me how to do Q10 (of 10) from the Introduction to R Course, Calculating Population Change Over Time with R.

I just don’t understand what it is asking me to do. What’s a results call, how do I do that? Basically, what is the answer, the code. It’s driving me mad.

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call the function to print a summary.

What’s a results call, how do I do that?

A call or invocation of a function is simply when you use the function.

If i have a function foo() that can just be done with


for example the print() function is often called and it doesn’t return anything, instead it writes to the output.

If foo() returns something in it’s definition, that return can be assigned to a variable

result <- foo()

So they’re asking you to call calculate_annual_growth() and pass in 5 arguments (that go in-between the parenthesis) and print that.

So the code might look like


where x, y, z, v, w are the corresponding arguments you put in (it’s in the description)

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