updates after up

quarto/differentiable_vector_calculus/plots_plotting.qmd

@@ -359,7 +359,7 @@ We can parameterize the sphere by plotting values for $x$, $y$, and $z$ produced
 
 
 ```{julia}
-#| hold: true
+#| eval: false
 thetas = range(0, stop=pi,   length=50)
 phis   = range(0, stop=pi/2, length=50)
 
@@ -379,6 +379,7 @@ For convenience, the `plot_parametric` function from `CalculusWithJulia` can pro
 
 
 ```{julia}
+#| eval: false
 #| hold: true
 F(theta, phi) = [X(1, theta, phi), Y(1, theta, phi), Z(1, theta, phi)]
 plot_parametric(0..pi, 0..pi/2, F)
@@ -401,6 +402,7 @@ $$
 To illustrate, we have:
 
 ```{julia}
+#| eval: false
 # cf. https://discourse.julialang.org/t/general-plotting-code-for-cone-in-3d-with-glmakie-or-plots/92104/3
 
 basecurve(u) = [cos(u), sin(u) + sin(u/2), 0]
@@ -419,6 +421,7 @@ To use it, we see what happens when a sphere if rendered:
 
 
 ```{julia}
+#| eval: false
 #| hold: true
 f(x,y,z) = x^2 + y^2 + z^2 - 25
 CalculusWithJulia.plot_implicit_surface(f)
@@ -428,6 +431,7 @@ This figure comes from a February 14, 2019 article in the [New York Times](https
 
 
 ```{julia}
+#| eval: false
 #| hold: true
 a,b = 1,3
 f(x,y,z) = (x^2+((1+b)*y)^2+z^2-1)^3-x^2*z^3-a*y^2*z^3