Multivariable Calculus, plane sketching

Click For Summary

Homework Help Overview

The discussion revolves around graphing the equation 4x² - 9y² = z in three-dimensional space, specifically focusing on how to sketch the corresponding hyperbolic paraboloid.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants inquire about the placement of axes for the graph and how to effectively sketch the hyperbolic paraboloid. There are discussions on using projections and intersections with coordinate planes to aid in visualization.

Discussion Status

Some participants have offered insights into the challenges of sketching the hyperbolic paraboloid and suggested starting with different values of z. There are mentions of software tools like gnuplot and Maple for graphing, indicating a variety of approaches being explored.

Contextual Notes

Participants are navigating the complexities of visualizing a hyperbolic paraboloid and discussing the potential need for graphic programs, with some constraints noted regarding the availability of free software options.

Twice
Messages
3
Reaction score
0
Member warned that the homework template must be used, together with some effort.
How do I know where to put the axes for the equation 4x^2 - 9y^2 = z when graphing in 3d?
 
Physics news on Phys.org
Twice said:
How do I know where to put the axes for the equation 4x^2 - 9y^2 = z when graphing in 3d?
That's up to you, which kind of projection you use. I always used
upload_2018-11-8_3-24-3.png
 

Attachments

  • upload_2018-11-8_3-23-36.png
    upload_2018-11-8_3-23-36.png
    944 bytes · Views: 363
  • upload_2018-11-8_3-24-3.png
    upload_2018-11-8_3-24-3.png
    397 bytes · Views: 464
Thank you. Can you please explain to me how to sketch the plane on the axes?
 
Twice said:
Thank you. Can you please explain to me how to sketch the plane on the axes?
Which plane? You have a hyperbolic paraboloid there.
upload_2018-11-8_3-34-27.png

https://www.wolframalpha.com/input/?i=4x^2+-+9y^2+=+z

Planes are relatively easy to sketch. One uses the intersections with the "three walls" (x=0;y=0;z=0) to get an impression of a plane.
 

Attachments

  • upload_2018-11-8_3-34-27.png
    upload_2018-11-8_3-34-27.png
    3.7 KB · Views: 650
Twice said:
Right, thanks, I meant how do I draw the hyperbolic paraboloid on the axes?
That's indeed not an easy task. I would start step by step along different values of ##z##. Maybe you will need to change the order of the coordinates to improve the picture, but that can only be said after you saw what it looks like. The link above got you how it would look like and it's very curved. Maybe there are better graphic programs out there, but I don't know them. (Of course there are, but I meant the freely available ones.)
 
Last edited:

Attachments

  • Nov2018SurfacePlot.png
    Nov2018SurfacePlot.png
    7.9 KB · Views: 355
Last edited:

Similar threads

Replies
7
Views
1K
  • · Replies 7 ·
Replies
7
Views
6K
Replies
2
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 4 ·
Replies
4
Views
818