How to solve a Non-Square Matrix Equation?

In summary, the individual is struggling to solve an equation involving three matrices, with one of the matrices being unknown. They are facing difficulties due to the underdetermined system and are unsure how to isolate the unknown matrix. They are considering using the minimum norm solution method, but are unsure if it will yield any solutions.
  • #1
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Homework Statement



I have to solve an equation like this:

Matrix A: dimensions [7000, 1]
Matrix B: dimensions [7000,8]
Matrix C: dimensions [8,1]

Matrix B is unknown.

Homework Equations



A=BxC

The Attempt at a Solution



I can't calculate the inverse of Matrix C because it is not square, then I don't know how to isolate B...
 
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  • #2
Welcome to PF!

You have what is referred to as an 'underdetermined system' where there are more unknowns (8 x 7000 = 56000) than there are equations (i.e. 7000). In this situation there are either no solutions or an infinite number of solutions. If you are being asked to find 'any' solution, one common (though arbitrary) method is to find what is called the 'minimum norm' solution (assuming solutions exist).
 

FAQ: How to solve a Non-Square Matrix Equation?

What is a non-square matrix equation?

A non-square matrix equation is an equation in which the number of columns in the matrix on the left side does not equal the number of rows in the matrix on the right side.

What is the difference between a square and non-square matrix equation?

A square matrix equation has an equal number of rows and columns, while a non-square matrix equation does not. This means that a square matrix equation can only be solved if the matrix on the left side is invertible, while a non-square matrix equation may have multiple solutions.

How do you solve a non-square matrix equation?

To solve a non-square matrix equation, you can use methods such as Gaussian elimination, Cramer's rule, or finding the inverse of the matrix on the left side. However, the solution may not always be unique and may require additional steps or assumptions.

What are some real-world applications of non-square matrix equations?

Non-square matrix equations are commonly used in fields such as engineering, physics, and economics to model systems with multiple variables and equations. They can also be used in data analysis and machine learning to solve systems of equations and make predictions.

What are the limitations of non-square matrix equations?

One limitation of non-square matrix equations is that they may not always have a unique solution. Additionally, solving these equations can be computationally intensive and may require advanced mathematical techniques. In some cases, these equations may also have no solution.

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