Solving Numerically the System: x^2+y^2=1 and xy=1/2

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In summary, solving a system numerically allows us to find approximate solutions to a set of equations by using numerical methods such as substitution, elimination, or graphing. The equations x^2+y^2=1 and xy=1/2 have significance in this system as they represent the relationship between the unknown variables. There are two possible solutions for x and y, (1/√2, 1/√2) and (-1/√2, -1/√2), and their accuracy can be checked by substituting them into the original equations or using a graphing calculator.
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wuyaosi
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Hi,

I am looking for the code of Matlab which can led me to solve numerically this system
x^2+y^2=1
xy= 1/2


I want to write a programm which can be able to solve numerically the above syatem


Thanks in advance
 
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  • #2
You can solve it exactly. If you don't see the answer by inspection, try y=1/(2x), so x^2 + 1/(4x^2) = 1, so z^2 - z + 1/4 = 0, where z = x^2.
 
  • #3
for your help!

Hi there,

There are a few different ways you could approach solving this system numerically using Matlab. One option would be to use the fsolve function, which is designed for solving systems of nonlinear equations. You would need to define a function that represents your system of equations, then use fsolve to find the numerical solution.

Another option would be to use the solve function, which is designed for symbolic math. This would allow you to find an exact solution, rather than a numerical one. However, it may be more computationally intensive and may not give a solution in certain cases.

I would suggest doing some research on these functions and experimenting with them to see which approach works best for your specific system of equations. Additionally, there may be other functions or methods that could be used to solve this system numerically, so it would be worth exploring different options and comparing their results.

I hope this helps and good luck with your programming!
 

1. What is the purpose of solving a system numerically?

Solving a system numerically allows us to find approximate solutions to a set of equations that cannot be solved algebraically. This is especially useful when the equations are complex and have multiple variables.

2. How do you solve a system numerically?

To solve a system numerically, we use numerical methods such as substitution, elimination, or graphing to find approximate values for the unknown variables. These methods involve using a series of calculations and approximations to get closer to the actual solution.

3. What is the significance of the equations x^2+y^2=1 and xy=1/2 in this system?

In this system, these equations represent the relationship between the two unknown variables, x and y. The first equation, x^2+y^2=1, is a circle with radius 1 centered at the origin. The second equation, xy=1/2, is a rectangular hyperbola that intersects the circle at two points, giving us two possible solutions for x and y.

4. What are the possible solutions for x and y in this system?

There are two possible solutions for x and y in this system. One solution is (1/√2, 1/√2), and the other is (-1/√2, -1/√2). These values satisfy both equations in the system, x^2+y^2=1 and xy=1/2.

5. How can we check if our numerical solution is accurate?

We can check the accuracy of our numerical solution by substituting the values for x and y into the original equations and checking if they satisfy the equations. We can also use a graphing calculator to plot the equations and see if the points we found are on the intersection of the two curves.

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