MATLAB Draw a polygon from line equation

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SUMMARY

This discussion focuses on drawing a quadrilateral in MATLAB using line equations instead of coordinates. Users suggest utilizing the plot or fplot functions to visualize the lines, while emphasizing the importance of using the hold on command to prevent unwanted extensions of the lines. To accurately plot the quadrilateral, the intersection points of the line equations must be calculated using MATLAB's solve function, which resolves the linear system formed by the equations.

PREREQUISITES
  • Understanding of MATLAB syntax and functions
  • Knowledge of linear equations and systems
  • Familiarity with plotting functions in MATLAB, specifically plot and fplot
  • Basic skills in solving equations using MATLAB's solve function
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  • Learn how to use MATLAB's solve function for finding intersections of linear equations
  • Explore the hold on command in MATLAB for layering plots
  • Research advanced plotting techniques in MATLAB for visualizing complex shapes
  • Study the mathematical principles behind solving linear systems
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Mathematics students, MATLAB users, and engineers looking to visualize geometric shapes using line equations.

minhduc515
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I'm trying to draw a quadrilateral in matlab. I has 4 line equations.
Can i draw that polygon, using line equations ? I knew MATLAB can draw polygon from coordinates, but i don't want to use it.
 
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You're saying that you want to draw a quadrilateral, and you have the equations of the four sides. Then just plot those lines, and they should intersect to give you the quadrilateral. Use the plot or fplot functions to plot the lines. Remember to use hold on between drawing the graphs.
 
Yes, i tried, but i don't want to have leftovers between two lines
 
minhduc515 said:
Yes, i tried, but i don't want to have leftovers between two lines
Are you saying that you don't want the sides be extended? In that case, you'll have to solve two equations at a time and find the coordinates of the four vertices. Then draw the lines from one vertex to the other, i.e. range ##x## from one vertex to the other, find ##y## for intermediate points, and plot.If you give the four equations, I can help you start.
 
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This is my polygon. a,b,Z are constants
I think it's hard to find intersect between lines, so it's the reason why i don't want using coordinates to plot
240772
 
minhduc515 said:
This is my polygon. a,b,Z are constants
I think it's hard to find intersect between lines, so it's the reason why i don't want using coordinates to plot
Two small questions: 1. One axis is X, the other is y or R? 2. Is everything other than x and you a constant (including z)?
 
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1. One axis is X, the other is R
2. Z, b and a are constant
 
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minhduc515 said:
I think it's hard to find intersect between lines
Finding the intersection between two lines is just a matter of solving a trivial linear system ...
 
Orodruin said:
Finding the intersection between two lines is just a matter of solving a trivial linear system ...
And it can be done using solve function.

To the OP: that's what you have to do. I can't connect to MATLAB currently from my phone (I have poor network), so I cannot try at this moment. Your variables are ##x## and ##R##. Use the above function to solve the equations.
 
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