Reputation
3,322
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
6 29
Newest
 Revival
Impact
~131k people reached

Jun
18
comment How to check if a point is in the direction of the normal of a plane?
Oops, i forgot to add the part where you check if $d$ is positive or negative. My bad.
Jun
18
revised How to check if a point is in the direction of the normal of a plane?
edited tags
Jun
18
answered How to check if a point is in the direction of the normal of a plane?
Jun
11
comment Envelope of two sine waves interfering
Wow, you were really lucky because it worked with your test function, but it failed with my test function.
Jun
11
comment Envelope of two sine waves interfering
I added a test function in the post so you can check your results.
Jun
11
revised Envelope of two sine waves interfering
added 84 characters in body
Jun
11
comment Envelope of two sine waves interfering
I did plot and it is not correct. Please check your work before posting an answer.
Jun
11
comment Envelope of two sine waves interfering
Based on what you stated a possible candinate is $$X_1+X_2 \cos((\omega_1-\omega_2) t+\varphi_1-\varphi_2) $$
Jun
11
comment Envelope of two sine waves interfering
Getting closer, but the envelope angular frequency is $\omega_1-\omega_2$ or half of that.
Jun
11
comment Envelope of two sine waves interfering
Nope, that is not it. The envelope function shouldn't cross zero. It should vary between $X_1+X_2$ and $|X_1-X_2|$
Jun
11
asked Envelope of two sine waves interfering
Jun
2
awarded  Revival
May
29
revised How to sketch $-3x^2 - 8xy + 3y^2 = 1$
added 164 characters in body
May
29
answered How to sketch $-3x^2 - 8xy + 3y^2 = 1$
May
27
comment How to find point on sphere from pitch and heading
Multiply each component by the radius $r$
May
24
comment The lines $x+2y+3=0$ , $x+2y-7=0$ and $2x-y+4=0$ are sides of a square. Equation of the remaining side is?
Same method/answer as me, and I answered a few seconds before you. Alas!
May
24
answered The lines $x+2y+3=0$ , $x+2y-7=0$ and $2x-y+4=0$ are sides of a square. Equation of the remaining side is?
May
21
revised Perpendicular vectors in 3d
added 134 characters in body
May
21
comment Perpendicular vectors in 3d
Or you can pick from $a=\hat{x}$, $a=\hat{y}$ or $a=\hat{z}$ depending which one gives the lowest $a \cdot u$.
May
21
comment Perpendicular vectors in 3d
You can pick a random $a$ and then subtract the parallel projection to $u$. Like $$ a \leftarrow a - u \frac{a \cdot u}{u \cdot u} $$