- #1

- 17

- 2

- Homework Statement:
- The linear transformation T: R^n---> R^m is defined by T(v)=Av. Find the values of n and m if A is the following matrix. How do i find n and m values?

- Relevant Equations:
- T(v)=Av

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- Thread starter dcarmichael
- Start date

- #1

- 17

- 2

- Homework Statement:
- The linear transformation T: R^n---> R^m is defined by T(v)=Av. Find the values of n and m if A is the following matrix. How do i find n and m values?

- Relevant Equations:
- T(v)=Av

- #2

Mark44

Mentor

- 35,392

- 7,269

For a matrix product Ax, where A is an m X n matrix (m rows and n columns) and x is an n X 1 matrix (a column vector), the product will be an m X 1 vector. In the problem, it's given that ##T:\mathbb R^n \to \mathbb R^m##, so x has to belong to which of these spaces, and T(x) has to belong to which of these spaces?Homework Statement:The linear transformation T: R^n---> R^m is defined by T(v)=Av. Find the values of n and m if A is the following matrix. How do i find n and m values?

Homework Equations:T(v)=Av

View attachment 251993

BTW, your doodling on the paper in the image doesn't come anywhere close to the answers to problem 2.

- #3

- 17

- 2

x Has to belong to Rn and T(x) must belong to RmFor a matrix product Ax, where A is an m X n matrix (m rows and n columns) and x is an n X 1 matrix (a column vector), the product will be an m X 1 vector. In the problem, it's given that ##T:\mathbb R^n \to \mathbb R^m##, so x has to belong to which of these spaces, and T(x) has to belong to which of these spaces?

BTW, your doodling on the paper in the image doesn't come anywhere close to the answers to problem 2.

- #4

lekh2003

Gold Member

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- #5

Mark44

Mentor

- 35,392

- 7,269

Right.x Has to belong to Rn and T(x) must belong to Rm

In problem 2b of the image you posted, it has ##A = \begin{bmatrix} 3 & 1 \\ 0 & 5 \\ 4 & 2\end{bmatrix}##, and A is a 3 X 2 matrix (m = 3, n = 2). Above it you wrote m = 3 and n = 1, which isn't correct. If x is a column matrix to the right of A, it needs to be <how big?> X 1? The number you get here is the dimension of the domain space.

And the result vector needs to be <how big?> X 1? The number here will be the dimension of the range space.

- #6

- 17

- 2

And x must be a vector of nx1 which will result in a 3x1 matrix in b so its going from R^2 from 3 to R^3Right.

In problem 2b of the image you posted, it has ##A = \begin{bmatrix} 3 & 1 \\ 0 & 5 \\ 4 & 2\end{bmatrix}##, and A is a 3 X 2 matrix (m = 3, n = 2). Above it you wrote m = 3 and n = 1, which isn't correct. If x is a column matrix to the right of A, it needs to be <how big?> X 1? The number you get here is the dimension of the domain space.

And the result vector needs to be <how big?> X 1? The number here will be the dimension of the range space.

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