change examples with help mode to avoid editor warnings

README.md

@@ -68,10 +68,15 @@ line (assuming you have downloaded Julia 1.7.2 and extracted it to `/opt` folder
 ## Organization of the code
 
 The codes for each chapter are stored in files named *chXX.jl*, where *XX* is
-chapter number. The only exception is chapter 14, where additionally a separate
-*ch14_server.jl* is present along with *ch14.jl* (the reason is that in this
-chapter we create a web service and the *ch14_server.jl* contains the
-server-side code that should be run in a separate Julia process).
+chapter number. The exceptions are
+
+* chapter 14, where additionally a separate *ch14_server.jl* is present along
+with *ch14.jl* (the reason is that in this chapter we create a web service and
+the *ch14_server.jl* contains the server-side code that should be run in a
+separate Julia process);
+* appendix A, where the file name used is *appA.txt* because it also
+  contains other instructions than only Julia code (in particular package
+  manager mode instructions).
 
 Solutions to the exercises that are presented in appendix B in
 the book are stored in *appB.jl* file. These solutions assume that they are

appA.txt

@@ -16,7 +16,9 @@ exit()
 
 # getting help
 
-?&&
+- press ?
+- write &&
+- press Enter
 
 # setting up the project environment for working with examples in the book
 # D:\\JuliaForDataAnalysis is an example folder

ch02.jl

@@ -49,8 +49,11 @@ Kamiński = 1
 x₁ = 0.5
 ε = 0.0001
 
-?₁
-?ε
+# - change to help mode by pressing `?` key
+# - type (or copy-paste) "₁" and press Enter
+
+# - change to help mode by pressing `?` key
+# - type (or copy-paste) "ε" and press Enter
 
 # Code for listing 2.3
 

ch03.jl

@@ -114,7 +114,10 @@ mean([1, 2, 3])
 # start a fresh Julia session before running this code
 using Statistics
 using StatsBase
-?winsor
+
+# - change to help mode by pressing `?` key
+# - type "winsor" and press Enter
+
 mean(winsor([8, 3, 1, 5, 7], count=1))
 
 # Code for section 3.4

ch04.jl

@@ -60,7 +60,9 @@ end
 [std(aq[:, j]) for j in axes(aq, 2)]
 
 axes(aq, 2)
-?Base.OneTo
+
+# - change to help mode by pressing `?` key
+# - type "Base.OneTo" and press Enter
 
 [mean(view(aq, :, j)) for j in axes(aq, 2)]
 [std(@view aq[:, j]) for j in axes(aq, 2)]
@@ -97,7 +99,8 @@ function R²(x, y)
 end
 [R²(aq[:, i], aq[:, i+1]) for i in 1:2:7]
 
-?²
+# - change to help mode by pressing `?` key
+# - type (or copy-paste) "²" and press Enter
 
 # Code for section 4.1.7