Added code for vignette-03

CODE/vignette-03-installing-using-packages.R

@@ -0,0 +1,32 @@
+# Example code for Vignette 3: Installing and Using Packages
+
+paste(nrow(available.packages()),
+      "packages on CRAN on",
+      Sys.Date())
+
+# Load several libraries
+required_packages = c("ggplot2", "dplyr")
+for (p in required_packages) {
+  library(p, character.only = TRUE)
+}
+
+# Friendly way of loading libraries: if present, load, if not, 
+# install and load
+required_packages = c("ggplot2", "dplyr")
+for (p in required_packages) {
+  if (!require(p, character.only = TRUE)) {
+    install.packages(p)
+    library(p, character.only = TRUE)
+  }
+}
+
+
+update.packages(ask = FALSE, checkBuilt = TRUE, Ncpus = 6)
+
+# From https://www.r-bloggers.com/2014/11/update-all-user-installed-r-packages-again/
+install.packages( 
+  lib  = lib <- .libPaths()[1],
+  pkgs = as.data.frame(installed.packages(lib), 
+                       stringsAsFactors=FALSE)$Package,
+  type = 'source'
+)

SLIDES/vignette-03-installing-using-packages.md

@@ -111,6 +111,16 @@ Use the command `install.packages()`
 
 ---
 
+# From GitHub
+
+Some packages are only on GitHub; others have their latest (testing) version on GitHub and a stable version on CRAN
+
+Need to use the `devtools` or `remotes` packages (maybe prefer `devtools`)
+
+You can also use the package [githubinstall](https://cran.r-project.org/web/packages/githubinstall/vignettes/githubinstall.html)
+
+---
+
 <!-- _backgroundImage: "linear-gradient(to bottom, red, black)" -->
 <a id="sec:loading"></a>
 # <!--fit-->Loading a package
@@ -215,4 +225,6 @@ Packages are stored by default in your home folder under the current major versi
 ~/R/x86_64-pc-linux-gnu-library/4.3/
 ```
 
-When the major version changes, you therefore need to do something with all your current packages...
+When the major version changes, you therefore need to do something with all your current packages..
+
+There is no planned mechanisms for doing this