Quick edits in locations

tools-appendix/modules/r/pages/index.adoc

@@ -28,14 +28,13 @@ R project site contains an extensive bibliography of books related to R: <http:/
 
 Here are some (tentative) topics covered in R section:
 
-
+* xref:reading-and-writing-data.adoc[Reading and Writing Data]
 * xref:variables.adoc[Variables]
 * xref:logical-operators.adoc[Logical Operators]
 * xref:lists-and-vectors.adoc[Lists and Vectors]
-* xref:data-frames.adoc[Data.Frames]
-* xref:reading-and-writing-data.adoc[Reading and Writing Data]
+* xref:data-frames.adoc[Data Frames]
 * xref:control-flow.adoc[Control Flow]
-* xref:writing-functions.adoc[Writing Functions]
+* xref:writing-functions.adoc[Functions]
 * xref:r-base-functions.adoc[R Base Functions]
 * xref:apply-functions.adoc[Apply Functions]
 * xref:plotting.adoc[Plotting]

tools-appendix/modules/r/pages/reading-and-writing-data.adoc

@@ -1,12 +1,26 @@
 = Reading and Writing Data
 
-== Examples
+If you are working with datasets in R, there are various ways to handle them. One of the most common tasks is importing your existing data into R. To do this, you first need to know your current working environment. You can use the following command to check your working directory:  
 
-=== How do I read a csv file called `grades.csv` into a data.frame?
+[source, R]
+----
+getwd()
+----
+
+This command will return the path of your current working directory, which is where R looks for files by default when reading or saving data.
+
+Also, `.` means the current working directory. 
 
-`.` means the current working directory. 
+Change your working directory:
+
+[source, R]
+----
+setwd("the place you want to go!")
+----
+
+=== How do I read a csv file called `grades.csv` into a data.frame?
 
-So, if we were in `/home/john/projects`, that is our current working directory.
+If we were in `/home/john/projects`, that is our current working directory.
 
 `./grades.csv` is the same as `/home/john/projects/grades.csv`. 
 In this case, `./grades.csv` is the _relative_ path.