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1d
comment Finding the equation of the straight line $y=ax+b$?
So what if the angle is $\pi/2$ then the slope is infinite.
1d
answered Final transformation matrix
1d
answered Finding the equation of the straight line $y=ax+b$?
1d
revised How can I find the co-ordinate of where a line intersects a circle?
added 1 character in body
1d
answered How can I find the co-ordinate of where a line intersects a circle?
2d
revised Solving system of nonlinear equations
added 1 character in body
2d
answered Solving system of nonlinear equations
2d
comment new plane equation after transformation of coordinates
$\mbox{ }^{-\intercal}$ is the inverse-transpose operator. Inverse and then transpose. Note that: $$\begin{bmatrix} R & \vec{t} \\ 0 & 1 \end{bmatrix}^{-\intercal} = \begin{bmatrix} R & 0 \\ -\vec{t}^\intercal R & 1 \end{bmatrix}$$ since $R^{-1} = R^\intercal$
Jul
28
revised new plane equation after transformation of coordinates
added 186 characters in body
Jul
28
answered new plane equation after transformation of coordinates
Jul
28
revised new plane equation after transformation of coordinates
Math formatting
Jul
28
comment Simple matrix derivative identity
FYI - Some people use ^\intercal ($A^\intercal$) or ^\top ($A^\top$) for the transpose. It looks much better than ^T.
Jul
27
comment Possible to express the diagonal matrix $D=\tiny\left(\begin{matrix}1&0&0\\0&2&0\\0&0&3\end{matrix}\right)$ as function of $3\times3$ identity matrix?
Just identity matrices, or can other elements be involved?
Jul
27
comment Solution for the trignometric equation
I recommend an initial value of $x_0=\frac{c}{b-a}$.
Jul
27
answered Find the equation of an equilateral hyperbola passing through a point of a circumference
Jul
24
comment find distance between 2 points
Direct url links to webpages are no effective. Please quote the answer and only supply the url for reference.
Jul
24
reviewed Approve find distance between 2 points
Jul
24
answered Vector Alignment
Jul
16
answered Decomposing rotation into rotation around certain axis and remaining rotation
Jul
16
comment Decomposing rotation into rotation around certain axis and remaining rotation
Look up the Rodrigue's Rotation Matrix