So how can you shift your thinking to get moving again when you're stuck and frustrated?

So how can you shift your thinking to get moving again when you're stuck and frustrated?

- Footnote: about the most descructive thing you can do is erase all of your files. Please don't do that.

Two quick-and-dirty tools that can be useful in testing your assumptions are `print`

and `class`

.

f <- function(a, b) { c <- a - 1 b / c } f(2, 1)

## [1] 1

# This returns something crazy! f(1, 2)

## [1] Inf

f <- function(a, b) { c <- a - 1 print(c) b / c } f(2, 1)

## [1] 1

## [1] 1

# This returns something crazy! f(1, 2)

## [1] 0

## [1] Inf

So we've made our denominator; hence our wierd division result.

f <- function(a, b) { c <- a - 1 d <- b / c } f(2, 1)

Why no number R??? Well, how about we capture our function's return in a variable:

e <- f(2, 1) class(e)

## [1] "numeric"

What is it? Can we make sense of that?

print(e)

## [1] 1

Here's the function you probably meant to implement:

f <- function(a, b) { c <- a - 1 b / c }