Finding the transformation matrix given the transformation Given the Transformation P (

mravinjakag

mravinjakag

Answered question

2022-06-12

Finding the transformation matrix given the transformation
Given the Transformation P ( x 1 , x 2 , x 3 ) = ( x 2 , x 3 ), and I'm supposed to find the transformation matrix A so that A ( x 1 , x 2 , x 3 ) = ( x 2 , x 3 )
How do I do this? I managed to find it for a previous question through trial and error but it took me a while and I need a good mathematical way to do it

Answer & Explanation

Jaida Sanders

Jaida Sanders

Beginner2022-06-13Added 18 answers

The general method is to find where the standard basis vectors are mapped. So first find
a = P ( 1 , 0 , 0 ), b = P ( 0 , 1 , 0 ), and c = P ( 0 , 0 , 1 ). The matrix which describes this transformation will then be
[ a b c ]
where a , b , and c are column vectors.
Here's why: Let
A = [ a 11 a 12 a 13 a 21 a 22 a 23 ]
Then A e ^ 1 = [ a 11 a 12 a 13 a 21 a 22 a 23 ] [ 1 0 0 ] = [ a 11 + 0 + 0 a 21 + 0 + 0 ] = [ a 11 a 21 ] . Likewise A e ^ 2 = [ a 12 a 22 ] and A e ^ 3 = [ a 13 a 23 ]
Thus all we need to do to specify our matrix is find how it transforms the standard basis vectors because each of those vectors will be the columns of the matrix.
Kiana Dodson

Kiana Dodson

Beginner2022-06-14Added 5 answers

The columns of the transformation are the result of applying P to the standard basis vectors. The first column, for example, is p ( 1 0 0 )

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