should we load packages in each chapter?

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should we load packages in each chapter? #14

Closed MattCowgill closed 5 years ago

MattCowgill commented 5 years ago

Three options:

Load packages once, at the top of the document;
Load packages once per chapter, at the top of the chapter; or
Load packages once, when they are introduced / first used.

A related question is whether each .Rmd document should be knit in a new session (the way it's currently structured they're knit in one session, so packages loaded in chapter 1 are available in chapter 2 etc.).

MattCowgill commented 5 years ago

So we've decided:

Load all packages used in a chapter at the top of the chapter (regardless of whether they've been loaded in previous chapters)
Install and load new packages as they are introduced to the reader

MattCowgill commented 5 years ago

PS with this in mind, I will change the settings so that the book builds one chapter at a time (rather than combining the chapters into one and then building). This will be a way to check that we've loaded all the necessary packages in each chapter, because if we forget one then it won't build.