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For a function of three variables, a level set is a surface in three-dimensional space that we will call a level surface. For a constant value $c$ in the range of $f(x,y,z)$, the level surface of $f$ is the implicit surface given by the graph of $c=f(x,y,z)$.
- Applet
For most three.js applets, you can drag with the mouse to...
- Level Set Examples
Examples demonstrating how to calculate level curves and...
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Example: Find a parametrization of (or a set of parametric...
- Surfaces Defined Implicitly
In addition, the level surfaces used to visualize the...
- Applet
Example 1: The graph of $z=f(x,\,y)$ as a surface in $3$-space can be regarded as the level surface $w = 0$ of the function $w(x,\,y,\,z) = z - f(x,\, y)$. Example 2: Spheres $x^2+y^2+z^2 = r^2$ can be interpreted as level surfaces $w = r^2$ of the function $w = x^2+y^2+z^2$.
How to sketch a typical level surface of a function....more.
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- Catherine Schmurr
Jan 28, 2022 · Level Curves and Surfaces. Often the reason you are interested in a surface in 3d is that it is the graph \(z=f(x,y)\) of a function of two variables \(f(x,y)\text{.}\) Another good way to visualize the behaviour of a function \(f(x,y)\) is to sketch what are called its level curves.
It is difficult to draw many interesting level surfaces by hand, but CalcPlot3D helps us explore them easily. There are actually two ways to enter and graph the level surface equations for a particular function of three variables in CalcPlot3D:
Therefore, the set \(f(x,y,z) = k\) describes a surface in 3D-space rather than a curve in 2D-space. The following diagram shows the level surfaces \[f(x,y,z) = x^2 + y^2 - x^2 = k\] for various \(k\) values. The level surfaces are hyperbolas of one or two sheets, depending on the values of \(k\).
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The level curves of f(x, y) are curves in the xy -plane along which f has a constant value. The level surfaces of f(x, y, z) are surfaces in xyz -space on which f has a constant value. Sometimes, level curves or surfaces are referred to as level sets.