use quarto, not Pluto to render pages

CwJ/precalc/variables.jmd

@@ -64,11 +64,9 @@ Variable names can be reused, as here, where we redefine `x`:
 x = 2
 ```
 
-```julia; echo=false
-note("""
-The `Pluto` interface for `Julia` is idiosyncratic, as variables are *reactive*. This interface allows changes to a variable `x` to propogate to all other cells referring to `x`. Consequently, the variable name can only be assigned *once* per notebook **unless** the name is in some other namespace, which can be arranged by including the assignment inside a function or a `let` block.
-""")
-```
+!!! note
+	The `Pluto` interface for `Julia` is idiosyncratic, as variables are *reactive*. This interface allows changes to a variable `x` to propogate to all other cells referring to `x`. Consequently, the variable name can only be assigned *once* per notebook **unless** the name is in some other namespace, which can be arranged by including the assignment inside a function or a `let` block.
+
 
 
 `Julia` is referred to as a "dynamic language" which means (in most
@@ -95,7 +93,7 @@ bottom = 5 - 6/7
 top/bottom
 ```
 
-#### Examples
+### Examples
 
 ##### Example
 
@@ -197,27 +195,22 @@ the `Main` module. `Julia` looks for variables in this module when it
 encounters an expression and the value is substituted. Other uses, such as when variables are defined within a function, involve different contexts which may not be
 visible within the `Main` module.
 
-```julia; echo=false;
-note("""
-The `varinfo` function will list the variables currently defined in the
-main workspace. There is no mechanism to delete a single variable.
-""")
-```
+!!! note
+	The `varinfo` function will list the variables currently defined in the
+	main workspace. There is no mechanism to delete a single variable.
 
-```julia; echo=false;
-alert("""
-**Shooting oneselves in the foot.** `Julia` allows us to locally
-redefine variables that are built in, such as the value for `pi` or
-the function object assigned to `sin`. For example, this is a
-perfectly valid command `sin=3`. However, it will overwrite the
-typical value of `sin` so that `sin(3)` will be an error. At the terminal, the
-binding to `sin` occurs in the `Main` module. This shadows that
-value of `sin` bound in the `Base` module. Even if redefined in
-`Main`, the value in base can be used by fully qualifying the name,
-as in `Base.sin(pi)`. This uses the notation
-`module_name.variable_name` to look up a binding in a module.
-""")
-```
+!!! warning
+	**Shooting oneselves in the foot.** `Julia` allows us to
+	locally redefine variables that are built in, such as the value
+	for `pi` or the function object assigned to `sin`. For example,
+	this is a perfectly valid command `sin=3`. However, it will
+	overwrite the typical value of `sin` so that `sin(3)` will be an
+	error. At the terminal, the binding to `sin` occurs in the `Main`
+	module. This shadows that value of `sin` bound in the `Base`
+	module. Even if redefined in `Main`, the value in base can be used
+	by fully qualifying the name, as in `Base.sin(pi)`. This uses the
+	notation `module_name.variable_name` to look up a binding in a
+	module.
 
 ## Variable names
 
@@ -268,17 +261,12 @@ For example, we could have defined `theta` (`\theta[tab]`) and `v0` (`v\_0[tab]`
 θ = 45; v₀ = 200
 ```
 
-These notes often use Unicode alternatives to avoid the `Pluto` requirement of a single use of assigning to a variable name in a notebook without placing the assignment in a `let` block or a function body.
+!!! note "Unicode"
+	These notes can be presented as HTML files *or* as `Pluto` notebooks. They often use Unicode alternatives to avoid the `Pluto` requirement of a single use of assigning to a variable name in a notebook without placing the assignment in a `let` block or a function body.
 
 
-```julia; echo=false;
-alert("""
-There is even support for tab-completion of
-[emojis](https://github.com/JuliaLang/julia/blob/master/stdlib/REPL/src/emoji_symbols.jl)
-such as `\\:snowman:[tab]` or `\\:koala:[tab]`
-
-""")
-```
+!!! note "Emojis"
+	There is even support for tab-completion of [emojis](https://github.com/JuliaLang/julia/blob/master/stdlib/REPL/src/emoji_symbols.jl) such as `\\:snowman:[tab]` or `\\:koala:[tab]`
 
 ##### Example
 
@@ -404,8 +392,8 @@ What is the result of the above?
 p, q = 0.25, 0.2;
 top = p - q;
 bottom = sqrt(p*(1-p));
-ans = top/bottom;
-numericq(ans)
+answ = top/bottom;
+numericq(answ)
 ```
 
 ###### Question
@@ -433,8 +421,8 @@ q"some_really_long_name_that_is_no_fun_to_type",
 q"aMiXeDcAsEnAmE",
 q"fahrenheit451"
 ]
-ans = 1
-radioq(choices, ans)
+answ = 1
+radioq(choices, answ)
 ```
 
 
@@ -445,8 +433,8 @@ Which of these symbols is  one of `Julia`'s built-in math constants?
 
 ```julia; hold=true; echo=false;
 choices = [q"pi", q"oo", q"E", q"I"]
-ans = 1
-radioq(choices, ans)
+answ = 1
+radioq(choices, answ)
 ```
 
 
@@ -464,8 +452,8 @@ choices=[
 q"\delta[tab] = 1/10",
 q"delta[tab] = 1/10",
 q"$\\delta$ = 1/10"]
-ans = 1
-radioq(choices, ans)
+answ = 1
+radioq(choices, answ)
 ```
 
 
@@ -478,8 +466,8 @@ choices = [
 q"a=1, b=2, c=3",
 q"a,b,c = 1,2,3",
 q"a=1; b=2; c=3"]
-ans = 1
-radioq(choices, ans)
+answ = 1
+radioq(choices, answ)
 ```
 
 ###### Question
@@ -497,6 +485,6 @@ choices = ["Assign all three variables at once to a value of `3`",
 "Create ``3`` linked values that will stay synced when any value changes",
 "Throw an error"
 ]
-ans = 1
-radioq(choices, ans)
+answ = 1
+radioq(choices, answ)
 ```