Vector field of gradient vector and contour plot

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Homework Help Overview

The discussion revolves around the properties of the gradient vector of a scalar field represented by the function ##\frac{xy}{3}## and its relationship to the contour plot of that function. Participants are examining the visual representation of the gradient and its perpendicularity to the contour lines.

Discussion Character

  • Conceptual clarification, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are questioning the visibility of the gradient's perpendicularity in the contour plot and discussing the completeness of the level curves. There are suggestions to adjust the sampling interval to improve the representation of the level curves.

Discussion Status

The discussion is active, with participants exploring different interpretations of the contour plot and the gradient's properties. Some guidance has been offered regarding the nature of the level curves and their relationship to the gradient, but there is no explicit consensus on the clarity of the plot.

Contextual Notes

There is a mention of missing level curves in the plot, which may affect the interpretation of the gradient's behavior. Additionally, a clarification is made regarding the nature of the function as a scalar field rather than an equation.

Leo Liu
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Homework Statement
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1624441288502.png

Given the equation ##\frac{xy} 3##. It is a fact that the gradient vector function is always perpendicular to the contour graph of the original function. However it is not so evident in the plot above. Any thought will be appreciated.
 
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Leo Liu said:
However it is not so evident in the plot above.
Why do you say that? It looks true to me in the plot.
 
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FactChecker said:
Why do you say that? It looks true to me in the plot.
Some of the level curves are missing. Maybe I should decrease the sampling interval for the level curves?
 
The level curves are all hyperbolas. Try imagining a couple more of them and see if it's crosses through the gradients perpendicularly.
 
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Leo Liu said:
Given the equation ##\frac{xy} 3##. It is a fact that the gradient vector function is always perpendicular to the contour graph of the original function. However it is not so evident in the plot above. Any thought will be appreciated.
##xy/3## is a scalar field, it is not an equation. An equation requires an equal sign.

Apart from that, it is quite apparent from the plot that the gradient is orthogonal to all of the level curves you have provided. I do not understand what more you want from such a plot.
 
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