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- For example, the level set of the function f (x,y,z)=x^2+y^2+z^2 corresponding to the value c is the sphere x^2+y^2+z^2=c with center (0,0,0) and radius sqrt (c). If n=2, the level set is a plane curve known as a level curve.
mathworld.wolfram.com/LevelSet.html
A graph of the various level curves of a function is called a contour map. Example: Making a Contour Map Given the function [latex]f\,(x,\ y)=\sqrt{8+8x-4y-4x^{2}-y^{2}}[/latex], find the level curve corresponding to [latex]c=0[/latex].
15.5.4 The Gradient and Level Curves. Theorem 15.11 states that in any direction orthogonal to the gradient. ∇f(a,b) , the function. f. does not change at. (a,b) Recall from Section 15.1 that the curve. f(x,y)=.
Nov 16, 2022 · The next topic that we should look at is that of level curves or contour curves. The level curves of the function \(z = f\left( {x,y} \right)\) are two dimensional curves we get by setting \(z = k\), where \(k\) is any number.
Find and graph the level curve of the function g (x, y) = x 2 + y 2 − 6 x + 2 y g (x, y) = x 2 + y 2 − 6 x + 2 y corresponding to c = 15. c = 15. Another useful tool for understanding the graph of a function of two variables is called a vertical trace.
Example 1. Let $f(x,y) = x^2-y^2$. We will study the level curves $c=x^2-y^2$. First, look at the case $c=0$. The level curve equation $x^2-y^2=0$ factors to $(x-y)(x+y)=0$. This equation is satisfied if either $y=x$ or $y=-x$. Both these are equations for lines, so the level curve for $c=0$ is two lines.
A level curve of a function $f(x,y)$ is the curve of points $(x,y)$ where $f(x,y)$ is some constant value. A level curve is simply a cross section of the graph of $z=f(x,y)$ taken at a constant value, say $z=c$.
Such a curve is called the level curve of height $c$ or the level curve with value $c$ and is denoted by $L(c)$ or by $f^{-1}(c)$. By drawing a number of level curves, we get what is called a contour plot or contour map, which provides a good representation of the function $z=f(x,y)$.
