- #1
Urmi Roy
- 753
- 1
So if I have a system of equations:
$$x_1+x_2+x_3=1$$
and $$x_4+x_5+x_6=1$$
Then they can be put into a matrix representation
\begin{equation*}
\begin{bmatrix}
1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 1 & 1\\
\end{bmatrix}
\begin{bmatrix}
x_1 \\
x_2 \\
x_3 \\
x_4 \\
x_5 \\
x_6 \\
\end{bmatrix}
=
\begin{bmatrix}
1 \\
1 \\
\end{bmatrix}
\end{equation*}
So I know that columns in a matrix represent vectors. Is it true that in this matrix we therefore have 6 2D vectors?
Also it looks like there are only 2 vectors, and 3 each of them.
It's just surprising to me that there are 6 variables and only 2D vectors.
If I imagine them to be 2D vectors in x-y plane, then they are also mutually perpendicular. So eventually, the equations I mentioned above, although they look like planes, are they just really the x and y axes?
I guess I'm confused in going from the vector interpretation to the equation interpretation of the matrix.
I would appreciate help in understanding how to interpret the matrix form
$$x_1+x_2+x_3=1$$
and $$x_4+x_5+x_6=1$$
Then they can be put into a matrix representation
\begin{equation*}
\begin{bmatrix}
1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & 0 & 1 & 1 & 1\\
\end{bmatrix}
\begin{bmatrix}
x_1 \\
x_2 \\
x_3 \\
x_4 \\
x_5 \\
x_6 \\
\end{bmatrix}
=
\begin{bmatrix}
1 \\
1 \\
\end{bmatrix}
\end{equation*}
So I know that columns in a matrix represent vectors. Is it true that in this matrix we therefore have 6 2D vectors?
Also it looks like there are only 2 vectors, and 3 each of them.
It's just surprising to me that there are 6 variables and only 2D vectors.
If I imagine them to be 2D vectors in x-y plane, then they are also mutually perpendicular. So eventually, the equations I mentioned above, although they look like planes, are they just really the x and y axes?
I guess I'm confused in going from the vector interpretation to the equation interpretation of the matrix.
I would appreciate help in understanding how to interpret the matrix form