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Linear Transformation - The Matrix of (not so hard)

  • Thread starter rad0786
  • Start date
  • #1
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1. Homework Statement

I have a linear map T:M(2x2) -------> M(2x2) defined by T(B) = [2 3; 4 0] * B

Find a 4 × 4 matrix representation of this linear transformation with respect to the basis of M(2×2)

2. Homework Equations

T(B) = [2 3; 4 0] * B


and the basis for M(2X2) is:

[1 0; 0 0]
[0 1; 0 0]
[0 0; 1 0]
[0 0; 0 1]



3. The Attempt at a Solution


T[1 0; 0 0] = [2 3; 4 0]*[1 0; 0 0] = [2 4; 0 0]
T[0 1; 0 0] = [2 3; 4 0]*[0 1; 0 0] = [0 0; 2 4]
T[0 0; 1 0] = [2 3; 4 0]*[0 0; 1 0] = [3 0; 0 0]
T[0 0; 0 1] = [2 3; 4 0]*[0 0; 0 1] = [0 3; 0 0]

Therefore, the matrix would be:

[2 0 3 0;
4 0 0 3;
0 2 0 0;
0 4 0 0]

Could somebody please veryify this for me.

I'd appreciate that
 

Answers and Replies

  • #2
112
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As long as you put the image vectors as columns in the 4x4 matrix, and you multiplied the 2x2 matrices correctly (double check this), you should not be worrying so much.
 
Last edited:
  • #3
188
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As long as you put the image vectors as columns in the 4x4 matrix, and you multiplied the 2x2 matrices correctly (double this), you should not be worrying so much.
Oh...

So what you are saying is that I DID my procedure correctly....and that final answer would be correct as long as my aritmatic is correct? :smile:

That makes me feel better...
 
  • #4
112
0
Oh...

So what you are saying is that I DID my procedure correctly....and that final answer would be correct as long as my aritmatic is correct? :smile:
that's right but double check the products wrt to the ordered basis you have chosen.

whoa, that's it. my dad is kicking me out of the computer for making too many posts.
 
Last edited:
  • #5
188
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Ohh okay...thanks.

And that is funny lol.
 

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