Transforming matrix for a linear transformation:












1












$begingroup$



Linear transformation: $T:mathbb{R}[X]_{≤2}rightarrowmathbb{R}^3$



With $T(f):=(f(0), f'(1),f(2))$ and $mathbb{R}[X]_{≤2}$ is the $mathbb{R}$-vector space of the polynomials of degree ≤2



Portray the linear transformation $T$ as matrix referring to the basis $1, X, X^2$ of $mathbb{R}[X]_{≤2}$ and the standard basis of $mathbb{R}^3$




Now I've done the transformation for both the bases, but I don't know if that works:



For the first one I obtain a matrix:



$[1,0,0]$



$[0,1,2]$



$[1,2,4]$



Doing $T(1)=(1,0,1)$, $T(X)=(0,1,2)$, $T(X^2)=(0,2,4)$



And for the standard basis I obtained a matrix:



$[1,0,0]$



$[0,0,0]$



$[0,0,1]$



Doing the same procedure with $T(e_1), T(e_2), T(e_3)$



I'm not sure it's right, and I don't know if I have to get just one another matrix instead of one. Sorry I don't know how to write matrices here...






linear-algebra matrices linear-transformations







share|cite|improve this question









$endgroup$

















    1












    $begingroup$



    Linear transformation: $T:mathbb{R}[X]_{≤2}rightarrowmathbb{R}^3$



    With $T(f):=(f(0), f'(1),f(2))$ and $mathbb{R}[X]_{≤2}$ is the $mathbb{R}$-vector space of the polynomials of degree ≤2



    Portray the linear transformation $T$ as matrix referring to the basis $1, X, X^2$ of $mathbb{R}[X]_{≤2}$ and the standard basis of $mathbb{R}^3$




    Now I've done the transformation for both the bases, but I don't know if that works:



    For the first one I obtain a matrix:



    $[1,0,0]$



    $[0,1,2]$



    $[1,2,4]$



    Doing $T(1)=(1,0,1)$, $T(X)=(0,1,2)$, $T(X^2)=(0,2,4)$



    And for the standard basis I obtained a matrix:



    $[1,0,0]$



    $[0,0,0]$



    $[0,0,1]$



    Doing the same procedure with $T(e_1), T(e_2), T(e_3)$



    I'm not sure it's right, and I don't know if I have to get just one another matrix instead of one. Sorry I don't know how to write matrices here...






    linear-algebra matrices linear-transformations







    share|cite|improve this question









    $endgroup$















      1












      1








      1





      $begingroup$



      Linear transformation: $T:mathbb{R}[X]_{≤2}rightarrowmathbb{R}^3$



      With $T(f):=(f(0), f'(1),f(2))$ and $mathbb{R}[X]_{≤2}$ is the $mathbb{R}$-vector space of the polynomials of degree ≤2



      Portray the linear transformation $T$ as matrix referring to the basis $1, X, X^2$ of $mathbb{R}[X]_{≤2}$ and the standard basis of $mathbb{R}^3$




      Now I've done the transformation for both the bases, but I don't know if that works:



      For the first one I obtain a matrix:



      $[1,0,0]$



      $[0,1,2]$



      $[1,2,4]$



      Doing $T(1)=(1,0,1)$, $T(X)=(0,1,2)$, $T(X^2)=(0,2,4)$



      And for the standard basis I obtained a matrix:



      $[1,0,0]$



      $[0,0,0]$



      $[0,0,1]$



      Doing the same procedure with $T(e_1), T(e_2), T(e_3)$



      I'm not sure it's right, and I don't know if I have to get just one another matrix instead of one. Sorry I don't know how to write matrices here...






      linear-algebra matrices linear-transformations







      share|cite|improve this question









      $endgroup$





      Linear transformation: $T:mathbb{R}[X]_{≤2}rightarrowmathbb{R}^3$



      With $T(f):=(f(0), f'(1),f(2))$ and $mathbb{R}[X]_{≤2}$ is the $mathbb{R}$-vector space of the polynomials of degree ≤2



      Portray the linear transformation $T$ as matrix referring to the basis $1, X, X^2$ of $mathbb{R}[X]_{≤2}$ and the standard basis of $mathbb{R}^3$




      Now I've done the transformation for both the bases, but I don't know if that works:



      For the first one I obtain a matrix:



      $[1,0,0]$



      $[0,1,2]$



      $[1,2,4]$



      Doing $T(1)=(1,0,1)$, $T(X)=(0,1,2)$, $T(X^2)=(0,2,4)$



      And for the standard basis I obtained a matrix:



      $[1,0,0]$



      $[0,0,0]$



      $[0,0,1]$



      Doing the same procedure with $T(e_1), T(e_2), T(e_3)$



      I'm not sure it's right, and I don't know if I have to get just one another matrix instead of one. Sorry I don't know how to write matrices here...






      linear-algebra matrices linear-transformations




      linear-algebra matrices linear-transformations






      share|cite|improve this question













      share|cite|improve this question











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      asked Dec 3 '18 at 17:29









      DadaDada

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          $begingroup$

          There was asked for only one matrix, namely the first one you got.

          Note that writing out the coordinates of a vector in $Bbb R^3$ implicitly uses the standard basis.

          So, we take one basis in the domain (the polynomials), and one in the codomain (the real triples), and ask for the matrix of the transformation with respect to these bases.






          share|cite|improve this answer









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            $begingroup$

            There was asked for only one matrix, namely the first one you got.

            Note that writing out the coordinates of a vector in $Bbb R^3$ implicitly uses the standard basis.

            So, we take one basis in the domain (the polynomials), and one in the codomain (the real triples), and ask for the matrix of the transformation with respect to these bases.






            share|cite|improve this answer









            $endgroup$


















              0












              $begingroup$

              There was asked for only one matrix, namely the first one you got.

              Note that writing out the coordinates of a vector in $Bbb R^3$ implicitly uses the standard basis.

              So, we take one basis in the domain (the polynomials), and one in the codomain (the real triples), and ask for the matrix of the transformation with respect to these bases.






              share|cite|improve this answer









              $endgroup$
















                0












                0








                0





                $begingroup$

                There was asked for only one matrix, namely the first one you got.

                Note that writing out the coordinates of a vector in $Bbb R^3$ implicitly uses the standard basis.

                So, we take one basis in the domain (the polynomials), and one in the codomain (the real triples), and ask for the matrix of the transformation with respect to these bases.






                share|cite|improve this answer









                $endgroup$



                There was asked for only one matrix, namely the first one you got.

                Note that writing out the coordinates of a vector in $Bbb R^3$ implicitly uses the standard basis.

                So, we take one basis in the domain (the polynomials), and one in the codomain (the real triples), and ask for the matrix of the transformation with respect to these bases.







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered Dec 3 '18 at 19:07









                BerciBerci

                60k23672




                60k23672






























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