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Wjx
Wjx
03:27
@Szabolcs great idea~ So will simply updating the question I've posted enough?
 
5 hours later…
kirma
kirma
08:15
i.imgur.com/ubXi4WW.gifv
Convergence of alignment of points under Lloyd's algorithm: hue is surrounding (hexagonal) lattice alignment offset, saturation is higher if standard deviation is low.
Basically, points arrange themselves to larger and larger domains over time, sharing the same alignment.
kirma
kirma
08:31
user image
Snapshot image of the same...
 
2 hours later…
Shutao TANG
Shutao TANG
10:53
Hi, guys!
Could someone who are familiar with Wolfram LibraryLink techinque give me an explanation about the difference between int const *dims and int const *dims?
This is the key problem written in this answer.
 
2 hours later…
blochwave
blochwave
12:27
@ShutaoTANG presumably you mean mint const *dims? I think the updated answer from happy fish explains it.
 
2 hours later…
J. M.
J. M.
14:13
@MichaelE2, have you already seen this, this, and this? (It seems likely you have, but I wanted to be sure.)
 
3 hours later…
Szabolcs
Szabolcs
16:48
@ShutaoTANG Both an int and a mint can have various sizes, but most likely in your case mint is 64-bit and int is 32-bit. Through pointers, you take the memory location where the 64-bit mint exists, take the first 32 bits of it, and interpret those bits as an int. Of course that's not going to be the same number that is stored in the mint ...
 
7 hours later…
Michael E2
Michael E2
23:34
@J.M. Thanks! I've seen Clenshaw and Clenshaw/Norton, but not the astronomy one. I played a little with linear DEs but not the nonlinear. Haven't really tried to tackle either one yet.
Mr.Wizard
Mr.Wizard
23:50
Do we have any older or better Original candidate for this particular question?:
0
Q: After NumberForm I cannot apply a Sine function. Why?

Imre VéghAfter NumberForm I cannot apply a Sine function. Why? This works: sol1 = x /. Solve[x^2 - 3 == 0, x] Sin[sol1] Output = $\{-Sin[\sqrt{3}],Sin[\sqrt{3}]\}$ Also this works: sol2 = x /. Solve[x^2 - 3 == 0, x] // N Sin[sol2] Output = $\{-0.987027,0.987027\}$ Then why doesn't this work? Mean...

equation-solving
This is closely related but about MatrixForm instead, and permits somewhat different answers:
34
Q: Why does MatrixForm affect calculations?

Alexey KalmykovThis is a really newbie question, but it has me confused. Why does this code work without // MatrixForm and doesn't work with // MatrixForm? cov = {{0.02, -0.01}, {-0.01, 0.04}} // MatrixForm W = {w1, w2}; FindMinimum[ W.cov.W, W] The error is: The function value ... is not a real number I...

matrix error faq

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