Reputation
Next tag badge:
112/100 score
19/20 answers
Badges
5 96 223
Newest
 Necromancer
Impact
~1.7m people reached

Sep
23
comment How to find a suitable contour to integrate round?
You're on the right track, compare my answer with your last expression; then use Mariano's hint.
Sep
23
comment What concepts were most difficult for you to understand in Calculus?
Community wiki I suppose.
Sep
23
answered How to find a suitable contour to integrate round?
Sep
23
comment Formula(/How) to find 2 numbers that add together to give one number and times to give another
"So this Vieta must have been a really smart guy, but you've rediscovered his trick." -LOL, thanks for making my day, Agusti! +1.
Sep
23
comment How do I divide a function into even and odd sections?
Personally, I wonder who first thought of decomposing $\exp(x)$ as $\sinh(x)+\cosh(x)$
Sep
23
comment How to find where $3$ lines intersect.
Agreed, the "Unix philosophy" works well in this case: keep the concurrency test and the routine for taking three lines at a time separate.
Sep
23
comment How to find where $3$ lines intersect.
I was talking about equation 9 in that link, but the three parallel lines "intersecting at infinity" works too. :)
Sep
22
comment Formula(/How) to find 2 numbers that add together to give one number and times to give another
Short version: it's the Vieta formulae for the quadratic case.
Sep
22
answered How to find where $3$ lines intersect.
Sep
22
comment Formula(/How) to find 2 numbers that add together to give one number and times to give another
You will end up with a quadratic equation when you replace either of c or d in the first equation with something derived from the second equation.
Sep
22
comment How to formulate such problem mathematicaly? (line continuation search)
The "angle" procedure in the SO answer you linked to finds the arctangent of the line segment's slope; the "nearly parallel" routine relies on the fact that the angle between two parallel/collinear segments is an integer multiple of $\pi$.
Sep
22
comment How can I remove rotations from points defining a plane?
@George: To make muad's comment explicit: Euler angles is what you need here. The actual rotation matrix is decomposable as a product of three orthogonals; inverting is as easy as transposing all three and multiplying in the reverse order.
Sep
22
comment How to formulate such problem mathematicaly? (line continuation search)
In short: could you give an example of your algorithm in action?
Sep
22
comment How do I prove this sum is not an integer
Note that your sum is merely $H_{k+n}-H_k$; a proof similar to the one in the linked question might work here as well.
Sep
22
comment How to formulate such problem mathematicaly? (line continuation search)
Rather unclear to me; you want to find the unbroken line that is the nearest approximation to those two green lines in your second diagram?
Sep
22
answered Looking for closed-form least squares solution of a simplified inverse kinematics problem
Sep
22
comment Finding a simple expression - Binomial Theorem
@Mike: You've gotten it. :)
Sep
22
answered algorithm to calculate the control points of a cubic Bezier curve
Sep
22
revised algorithm to calculate the control points of a cubic Bezier curve
edited tags
Sep
22
comment Find the range of $x$, given $y_{min} \leq y(x) \leq y_{max}$, where $y(x) $ can be any function ( Updated)
Dear Ngu, I think people would really love it if we didn't have to wring and squeeze you for details every time you ask a question. As I said in one of your previous questions, explicitly mention any reasonable (to you) constraints your problem has, since attacking a structured problem is much easier than playing blind man's bluff.