minor updates to existing two slide decks/notes

- grades data file - metadata for updated personal site
xp-song · Oct 19, 2022 · 7dd51de · 7dd51de
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diff --git a/1_R_environ_and_syntax_slides.pdf b/1_R_environ_and_syntax_slides.pdf
diff --git a/2_Data_wrangling_and_visualisation_slides.pdf b/2_Data_wrangling_and_visualisation_slides.pdf
diff --git a/data/grades.csv b/data/grades.csv
@@ -1,8 +1,8 @@
 subject,grade,grade_point,credits
-Math,A,5,5
+Math,A,4.5,5
 English,B,3.5,5
 Economics,C,2,4
 Mandarin,B+,4,5
-Sleeping,A+,5,0
-Cantrmbr,F,1,5
+Music,F,1,0
+History,C+,2.5,5
 Intro2R,A+,5,1
diff --git a/notes/1_R_environ_and_syntax.Rmd b/notes/1_R_environ_and_syntax.Rmd
@@ -1,8 +1,8 @@
 ---
 title: "R Environment and Syntax"
 subtitle: "[Intro2R](https://github.com/xp-song/Intro2R) crash course: Session 1 of 2"
-author: "author: [Song, Xiao Ping](https://xp-song.github.io)"
-date: "updated: `r Sys.Date()`"
+author: "Author: [Song, Xiao Ping](https://xp-song.github.io)"
+date: "Last updated on `r Sys.Date()`"
 output:
   html_document:
     toc: true
@@ -446,4 +446,4 @@ __Others:__
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a>
 
-Copyright (c) `r format(Sys.Date(), "%Y")` Song, Xiao Ping
+Copyright © `r format(Sys.Date(), "%Y")` Song, Xiao Ping
diff --git a/notes/1_R_environ_and_syntax.html b/notes/1_R_environ_and_syntax.html
diff --git a/notes/2_Data_wrangling_and_visualisation.Rmd b/notes/2_Data_wrangling_and_visualisation.Rmd
@@ -1,8 +1,8 @@
 ---
 title: "Data Wrangling and Visualisation"
 subtitle: "[Intro2R](https://github.com/xp-song/Intro2R) crash course: Session 2 of 2"
-author: "author: [Song, Xiao Ping](https://xp-song.github.io)"
-date: "updated: `r Sys.Date()`"
+author: "Author: [Song, Xiao Ping](https://xp-song.github.io)"
+date: "Last updated on `r Sys.Date()`"
 output:
   html_document:
     toc: true
@@ -394,7 +394,7 @@ dev.off() #finish creating the image file
 
 ## Innovation
 
-```{r fig.height = 7, fig.width = 8}
+```{r fig.height = 7, fig.width = 8, warning = FALSE, message = FALSE}
 library(ggrepel) 
 
 ggplot(ctry_data, aes(x = respop10k, 
@@ -464,4 +464,4 @@ __Other resources__
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons Licence" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a>
 
-Copyright (c) `r format(Sys.Date(), "%Y")` Song, Xiao Ping
+Copyright © `r format(Sys.Date(), "%Y")` Song, Xiao Ping
diff --git a/notes/2_Data_wrangling_and_visualisation.html b/notes/2_Data_wrangling_and_visualisation.html