The matrix P is the transition matrix from what basis B to the basis B'
$begingroup$
The Matrix
begin{equation}
P = begin{bmatrix}1 & 1 & 0 \ 0 & 1 & 3 \ 3 & 0 & 1
end{bmatrix}
end{equation} is the transition matrix from what basis B to the basis B' = {(1,0,0),(1,1,0),(1,1,1)} for R3?
I'm having a hard time with this one, any help is appreciated, thanks :)
linear-algebra matrices
$endgroup$
add a comment |
$begingroup$
The Matrix
begin{equation}
P = begin{bmatrix}1 & 1 & 0 \ 0 & 1 & 3 \ 3 & 0 & 1
end{bmatrix}
end{equation} is the transition matrix from what basis B to the basis B' = {(1,0,0),(1,1,0),(1,1,1)} for R3?
I'm having a hard time with this one, any help is appreciated, thanks :)
linear-algebra matrices
$endgroup$
$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38
add a comment |
$begingroup$
The Matrix
begin{equation}
P = begin{bmatrix}1 & 1 & 0 \ 0 & 1 & 3 \ 3 & 0 & 1
end{bmatrix}
end{equation} is the transition matrix from what basis B to the basis B' = {(1,0,0),(1,1,0),(1,1,1)} for R3?
I'm having a hard time with this one, any help is appreciated, thanks :)
linear-algebra matrices
$endgroup$
The Matrix
begin{equation}
P = begin{bmatrix}1 & 1 & 0 \ 0 & 1 & 3 \ 3 & 0 & 1
end{bmatrix}
end{equation} is the transition matrix from what basis B to the basis B' = {(1,0,0),(1,1,0),(1,1,1)} for R3?
I'm having a hard time with this one, any help is appreciated, thanks :)
linear-algebra matrices
linear-algebra matrices
edited Apr 6 '15 at 22:38
user99914
asked Apr 6 '15 at 22:32
fatty cakezfatty cakez
2114
2114
$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38
add a comment |
$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38
$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38
$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
let the basis $B = {u, v, w}.$ then $$Pu = 1(1,0,0)^T+3(1,1,1)^T to u = P^{-1}(4,3,3)^T = pmatrix{0.1&-0.1&0.3\0.9&0.1&-0.3\-0.3&0.3&0.1}pmatrix{4\3\3}=pmatrix{1\3\0.}$$
can you find $v, w?$
$endgroup$
add a comment |
$begingroup$
$mathbf{Hint}:$Recall that the transition matrix has the coordinates of the basis you are looking for as its columns, that is suppose your basis is B=${[(x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)]}={(b_1,b_2,b_3)}$
$$1(1,0,0)+0(1,1,0)+3(1,1,1)=(4,3,3)$$
$$1(1,0,0)+1(1,1,0)+0(1,1,1)=(2,1,0)$$
what next?
$endgroup$
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
add a comment |
$begingroup$
Possibly, the best approach to the matter is in this way.
Given a matrix $bf P$, you can see it as converting the standard base ($bf I$)
into the vertical vectors of $bf P$.
$$
begin{array}{l}
{bf P} = {bf P};{bf I}quad Rightarrow quad left( {{bf p}_1 |{bf p}_2 |{bf p}_3 } right) = {bf P}left( {{bf u}_1 |{bf u}_2 |{bf u}_3 } right)quad Rightarrow quad {bf p}_k = {bf P};{bf u}_k \
quad Downarrow ;{rm if},{bf P},{rm invertible} \
{bf I} = {bf P}^{, - ,{bf 1}} ;{bf P} = {bf P};{bf P}^{, - ,{bf 1}} \
end{array}
$$
If the vectors of $bf P$ also constitute a basis, that implies that the matrix is invertible
and that you can reverse the process, getting
$ {bf P}^{, - ,{bf 1}}$ converts ${bf P}$ to ${bf I}$, and
${bf P}$ converts $ {bf P}^{, - ,{bf 1}}$ to ${bf I}$.
So, for any matrix $bf X$ and any invertible $bf P$ we can write
$$
{bf X} = {bf I};{bf X} = {bf P};{bf P}^{, - ,{bf 1}} ;{bf X} = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right)
$$
Coming to your case, the above simply translates into
$$ bbox[lightyellow] {
{bf X} = left( {begin{array}{*{20}c}
1 & 1 & 1 \
0 & 1 & 1 \
0 & 0 & 1 \
end{array}} right) = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right) = left( {begin{array}{*{20}c}
1 & 1 & 0 \
0 & 1 & 3 \
3 & 0 & 1 \
end{array}} right)left( {frac{1}{{10}}left( {begin{array}{*{20}c}
1 & 0 & 3 \
9 & {10} & 7 \
{ - 3} & 0 & 1 \
end{array}} right)} right)
} $$
$endgroup$
add a comment |
Your Answer
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
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votes
$begingroup$
let the basis $B = {u, v, w}.$ then $$Pu = 1(1,0,0)^T+3(1,1,1)^T to u = P^{-1}(4,3,3)^T = pmatrix{0.1&-0.1&0.3\0.9&0.1&-0.3\-0.3&0.3&0.1}pmatrix{4\3\3}=pmatrix{1\3\0.}$$
can you find $v, w?$
$endgroup$
add a comment |
$begingroup$
let the basis $B = {u, v, w}.$ then $$Pu = 1(1,0,0)^T+3(1,1,1)^T to u = P^{-1}(4,3,3)^T = pmatrix{0.1&-0.1&0.3\0.9&0.1&-0.3\-0.3&0.3&0.1}pmatrix{4\3\3}=pmatrix{1\3\0.}$$
can you find $v, w?$
$endgroup$
add a comment |
$begingroup$
let the basis $B = {u, v, w}.$ then $$Pu = 1(1,0,0)^T+3(1,1,1)^T to u = P^{-1}(4,3,3)^T = pmatrix{0.1&-0.1&0.3\0.9&0.1&-0.3\-0.3&0.3&0.1}pmatrix{4\3\3}=pmatrix{1\3\0.}$$
can you find $v, w?$
$endgroup$
let the basis $B = {u, v, w}.$ then $$Pu = 1(1,0,0)^T+3(1,1,1)^T to u = P^{-1}(4,3,3)^T = pmatrix{0.1&-0.1&0.3\0.9&0.1&-0.3\-0.3&0.3&0.1}pmatrix{4\3\3}=pmatrix{1\3\0.}$$
can you find $v, w?$
answered Apr 6 '15 at 22:57
abelabel
26.6k12048
26.6k12048
add a comment |
add a comment |
$begingroup$
$mathbf{Hint}:$Recall that the transition matrix has the coordinates of the basis you are looking for as its columns, that is suppose your basis is B=${[(x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)]}={(b_1,b_2,b_3)}$
$$1(1,0,0)+0(1,1,0)+3(1,1,1)=(4,3,3)$$
$$1(1,0,0)+1(1,1,0)+0(1,1,1)=(2,1,0)$$
what next?
$endgroup$
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
add a comment |
$begingroup$
$mathbf{Hint}:$Recall that the transition matrix has the coordinates of the basis you are looking for as its columns, that is suppose your basis is B=${[(x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)]}={(b_1,b_2,b_3)}$
$$1(1,0,0)+0(1,1,0)+3(1,1,1)=(4,3,3)$$
$$1(1,0,0)+1(1,1,0)+0(1,1,1)=(2,1,0)$$
what next?
$endgroup$
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
add a comment |
$begingroup$
$mathbf{Hint}:$Recall that the transition matrix has the coordinates of the basis you are looking for as its columns, that is suppose your basis is B=${[(x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)]}={(b_1,b_2,b_3)}$
$$1(1,0,0)+0(1,1,0)+3(1,1,1)=(4,3,3)$$
$$1(1,0,0)+1(1,1,0)+0(1,1,1)=(2,1,0)$$
what next?
$endgroup$
$mathbf{Hint}:$Recall that the transition matrix has the coordinates of the basis you are looking for as its columns, that is suppose your basis is B=${[(x_1,y_1,z_1),(x_2,y_2,z_2),(x_3,y_3,z_3)]}={(b_1,b_2,b_3)}$
$$1(1,0,0)+0(1,1,0)+3(1,1,1)=(4,3,3)$$
$$1(1,0,0)+1(1,1,0)+0(1,1,1)=(2,1,0)$$
what next?
answered Apr 6 '15 at 22:57
QualityQuality
2,99141543
2,99141543
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
add a comment |
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
$begingroup$
Hey. If you don't mind me asking. Is (4,3,3) , (2,1,0) and ( 4,4,1) the basis B? I arrived at the answer
$endgroup$
– Zhi J Teoh
Nov 11 '15 at 4:01
add a comment |
$begingroup$
Possibly, the best approach to the matter is in this way.
Given a matrix $bf P$, you can see it as converting the standard base ($bf I$)
into the vertical vectors of $bf P$.
$$
begin{array}{l}
{bf P} = {bf P};{bf I}quad Rightarrow quad left( {{bf p}_1 |{bf p}_2 |{bf p}_3 } right) = {bf P}left( {{bf u}_1 |{bf u}_2 |{bf u}_3 } right)quad Rightarrow quad {bf p}_k = {bf P};{bf u}_k \
quad Downarrow ;{rm if},{bf P},{rm invertible} \
{bf I} = {bf P}^{, - ,{bf 1}} ;{bf P} = {bf P};{bf P}^{, - ,{bf 1}} \
end{array}
$$
If the vectors of $bf P$ also constitute a basis, that implies that the matrix is invertible
and that you can reverse the process, getting
$ {bf P}^{, - ,{bf 1}}$ converts ${bf P}$ to ${bf I}$, and
${bf P}$ converts $ {bf P}^{, - ,{bf 1}}$ to ${bf I}$.
So, for any matrix $bf X$ and any invertible $bf P$ we can write
$$
{bf X} = {bf I};{bf X} = {bf P};{bf P}^{, - ,{bf 1}} ;{bf X} = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right)
$$
Coming to your case, the above simply translates into
$$ bbox[lightyellow] {
{bf X} = left( {begin{array}{*{20}c}
1 & 1 & 1 \
0 & 1 & 1 \
0 & 0 & 1 \
end{array}} right) = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right) = left( {begin{array}{*{20}c}
1 & 1 & 0 \
0 & 1 & 3 \
3 & 0 & 1 \
end{array}} right)left( {frac{1}{{10}}left( {begin{array}{*{20}c}
1 & 0 & 3 \
9 & {10} & 7 \
{ - 3} & 0 & 1 \
end{array}} right)} right)
} $$
$endgroup$
add a comment |
$begingroup$
Possibly, the best approach to the matter is in this way.
Given a matrix $bf P$, you can see it as converting the standard base ($bf I$)
into the vertical vectors of $bf P$.
$$
begin{array}{l}
{bf P} = {bf P};{bf I}quad Rightarrow quad left( {{bf p}_1 |{bf p}_2 |{bf p}_3 } right) = {bf P}left( {{bf u}_1 |{bf u}_2 |{bf u}_3 } right)quad Rightarrow quad {bf p}_k = {bf P};{bf u}_k \
quad Downarrow ;{rm if},{bf P},{rm invertible} \
{bf I} = {bf P}^{, - ,{bf 1}} ;{bf P} = {bf P};{bf P}^{, - ,{bf 1}} \
end{array}
$$
If the vectors of $bf P$ also constitute a basis, that implies that the matrix is invertible
and that you can reverse the process, getting
$ {bf P}^{, - ,{bf 1}}$ converts ${bf P}$ to ${bf I}$, and
${bf P}$ converts $ {bf P}^{, - ,{bf 1}}$ to ${bf I}$.
So, for any matrix $bf X$ and any invertible $bf P$ we can write
$$
{bf X} = {bf I};{bf X} = {bf P};{bf P}^{, - ,{bf 1}} ;{bf X} = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right)
$$
Coming to your case, the above simply translates into
$$ bbox[lightyellow] {
{bf X} = left( {begin{array}{*{20}c}
1 & 1 & 1 \
0 & 1 & 1 \
0 & 0 & 1 \
end{array}} right) = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right) = left( {begin{array}{*{20}c}
1 & 1 & 0 \
0 & 1 & 3 \
3 & 0 & 1 \
end{array}} right)left( {frac{1}{{10}}left( {begin{array}{*{20}c}
1 & 0 & 3 \
9 & {10} & 7 \
{ - 3} & 0 & 1 \
end{array}} right)} right)
} $$
$endgroup$
add a comment |
$begingroup$
Possibly, the best approach to the matter is in this way.
Given a matrix $bf P$, you can see it as converting the standard base ($bf I$)
into the vertical vectors of $bf P$.
$$
begin{array}{l}
{bf P} = {bf P};{bf I}quad Rightarrow quad left( {{bf p}_1 |{bf p}_2 |{bf p}_3 } right) = {bf P}left( {{bf u}_1 |{bf u}_2 |{bf u}_3 } right)quad Rightarrow quad {bf p}_k = {bf P};{bf u}_k \
quad Downarrow ;{rm if},{bf P},{rm invertible} \
{bf I} = {bf P}^{, - ,{bf 1}} ;{bf P} = {bf P};{bf P}^{, - ,{bf 1}} \
end{array}
$$
If the vectors of $bf P$ also constitute a basis, that implies that the matrix is invertible
and that you can reverse the process, getting
$ {bf P}^{, - ,{bf 1}}$ converts ${bf P}$ to ${bf I}$, and
${bf P}$ converts $ {bf P}^{, - ,{bf 1}}$ to ${bf I}$.
So, for any matrix $bf X$ and any invertible $bf P$ we can write
$$
{bf X} = {bf I};{bf X} = {bf P};{bf P}^{, - ,{bf 1}} ;{bf X} = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right)
$$
Coming to your case, the above simply translates into
$$ bbox[lightyellow] {
{bf X} = left( {begin{array}{*{20}c}
1 & 1 & 1 \
0 & 1 & 1 \
0 & 0 & 1 \
end{array}} right) = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right) = left( {begin{array}{*{20}c}
1 & 1 & 0 \
0 & 1 & 3 \
3 & 0 & 1 \
end{array}} right)left( {frac{1}{{10}}left( {begin{array}{*{20}c}
1 & 0 & 3 \
9 & {10} & 7 \
{ - 3} & 0 & 1 \
end{array}} right)} right)
} $$
$endgroup$
Possibly, the best approach to the matter is in this way.
Given a matrix $bf P$, you can see it as converting the standard base ($bf I$)
into the vertical vectors of $bf P$.
$$
begin{array}{l}
{bf P} = {bf P};{bf I}quad Rightarrow quad left( {{bf p}_1 |{bf p}_2 |{bf p}_3 } right) = {bf P}left( {{bf u}_1 |{bf u}_2 |{bf u}_3 } right)quad Rightarrow quad {bf p}_k = {bf P};{bf u}_k \
quad Downarrow ;{rm if},{bf P},{rm invertible} \
{bf I} = {bf P}^{, - ,{bf 1}} ;{bf P} = {bf P};{bf P}^{, - ,{bf 1}} \
end{array}
$$
If the vectors of $bf P$ also constitute a basis, that implies that the matrix is invertible
and that you can reverse the process, getting
$ {bf P}^{, - ,{bf 1}}$ converts ${bf P}$ to ${bf I}$, and
${bf P}$ converts $ {bf P}^{, - ,{bf 1}}$ to ${bf I}$.
So, for any matrix $bf X$ and any invertible $bf P$ we can write
$$
{bf X} = {bf I};{bf X} = {bf P};{bf P}^{, - ,{bf 1}} ;{bf X} = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right)
$$
Coming to your case, the above simply translates into
$$ bbox[lightyellow] {
{bf X} = left( {begin{array}{*{20}c}
1 & 1 & 1 \
0 & 1 & 1 \
0 & 0 & 1 \
end{array}} right) = {bf P};left( {{bf P}^{, - ,{bf 1}} ;{bf X}} right) = left( {begin{array}{*{20}c}
1 & 1 & 0 \
0 & 1 & 3 \
3 & 0 & 1 \
end{array}} right)left( {frac{1}{{10}}left( {begin{array}{*{20}c}
1 & 0 & 3 \
9 & {10} & 7 \
{ - 3} & 0 & 1 \
end{array}} right)} right)
} $$
answered May 4 '17 at 13:15
G CabG Cab
19.6k31239
19.6k31239
add a comment |
add a comment |
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$begingroup$
Is that the matrix you want?
$endgroup$
– user99914
Apr 6 '15 at 22:38