Empty Global Env before each chapter (csgillespie#162)

01-introduction.Rmd

@@ -1,3 +1,10 @@
+---
+knit: "bookdown::preview_chapter"
+---
+```{r}
+rm(list=ls())
+```
+
 # Introduction {#introduction}
 
 This chapter introduces the book. It describes the wide range of people it was written for, in terms of R and programming experience, and how you can get the most out of it. Anyone setting out to improve efficiency should have an understanding of precisely what they mean by the term, and this is discussed, with reference to *algorithmic* and *programmer* efficiency in Section \@ref(what-is-efficiency), and with reference to R in particular in \@ref(what-is-efficient-r-programming). It may seem obvious, but it's also worth thinking about *why* anyone would bother with efficient code now that powerful computers are cheap and accessible. This is covered in Section \@ref(why-efficiency).

02-set-up.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 ```{r echo=FALSE}
 data("USArrests", package="datasets")

04-workflow.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 # Efficient workflow {#workflow}
 

05-input-output.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 # Efficient input/output {#input-output}
 

06-data-carpentry.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 <!-- To do: -->
 <!-- Talk about merge vs *_join -->

08-hardware.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 # Efficient hardware {#hardware}
 

09-collaboration.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 ```{r echo=FALSE, message=FALSE}
 library(dplyr)

10-learning.Rmd

@@ -1,6 +1,9 @@
 ---
 knit: "bookdown::preview_chapter"
 ---
+```{r}
+rm(list=ls())
+```
 
 # Efficient learning {#learning}