I'm a professor of mathematics at the University of North Carolina Asheville. I've also done a fair amount of consulting work over the years focusing on scientific and data visualization.
I'm happy to be part of the first Observable Ambassador's cohort.
Public
Edited
Jan 27, 2023
2 forks
4 stars
Contour plotsParametric Plot 2DParametric region generatorPolar CoordinatesDouble and iterated integralsHills and valleysLevel surfacesA strange discontinuityTangent plane to a level surfaceGradient ascentPartial derivativesFunctions of two variablesTracing a path on a sphereDisks for a solid of revolutionA Taylor series about π/4\pi/4π/4
Animated Helix
Also listed in…
PlotX3D
helix_anim = {
let d = 1 / 128;
let pts = d3
.range(0, 1 + d, d)
.map((t) => [cos(8 * pi * t), sin(8 * pi * t), 10 * t - 5]);
let anim = show_x3d(
[
create_indexedLineSet([pts]),
create_sphere([1, 0, 0], 0.08, { id: "point" })
],
{
width: w,
height: h,
extent: [
[-1.3, 1.3],
[-1.3, 1.3],
[-4, 4]
]
}
);
return anim;
}
linear_anim = {
let d = 1 / 32;
let anim = show_x3d([create_sphere([0, 0, 0], 0.08, { id: "point" })], {
width: w,
height: h,
extent: [
[-1.3, 1.3],
[-1.3, 1.3],
[-4, 4]
]
});
return anim;
}
circular_anim = {
let d = 1 / 32;
let pts = d3
.range(0, 1 + d, d)
.map((t) => [cos(2 * pi * t), sin(2 * pi * t), 0]);
let anim = show_x3d(
[
create_indexedLineSet([pts]),
create_sphere([1, 0, 0], 0.08, { id: "point" })
],
{
width: w,
height: h,
extent: [
[-1.3, 1.3],
[-1.3, 1.3],
[-4, 4]
]
}
);
return anim;
}
run = {
let t = (now % 2000) / 2000;
d3.select(circular_anim)
.select("transform#point")
.select("transform")
.attr("translation", `${cos(8 * pi * t)},${sin(8 * pi * t)},0`);
d3.select(linear_anim)
.select("transform#point")
.select("transform")
.attr("translation", `0,0,${10 * t - 5}`);
d3.select(helix_anim)
.select("transform#point")
.select("transform")
.attr("translation", `${cos(8 * pi * t)},${sin(8 * pi * t)},${10 * t - 5}`);
}
w = d3.min([200, 0.32 * width])
h = 4 * w
pi = Math.PI
sin = Math.sin
cos = Math.cos
import {
show_x3d,
create_indexedLineSet,
create_sphere
} from "@mcmcclur/plotx3d"
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