[math-fun] how to make a rhombic dodecahedon
I asked Neil if Kepler's sphere-stacking conjecture was about tetrahedral or square pyramids of cannonballs. He fooled with Mathematica briefly and said it doesn't matter <http://gosper.org/kepvor.png>. --rwg
If you imagine a 5x1 rectangular array of spheres centered above and lying upon a 4x2 rectangular array of spheres, likewise upon a 3x3, likewise upon a 2x4, likewise upon a 1x5 . . . then you see how a tetrahedral array of spheres can also be thought of as layers of square arrays of spheres each nestled in the hollows of the one below it. --Dan On 2013-06-21, at 3:43 AM, Bill Gosper wrote:
I asked Neil if Kepler's sphere-stacking conjecture was about tetrahedral or square pyramids of cannonballs. He fooled with Mathematica briefly and said it doesn't matter <http://gosper.org/kepvor.png>. --rwg _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
DanA> If you imagine a 5x1 rectangular array of spheres centered above and lying upon a 4x2 rectangular array of spheres, likewise upon a 3x3, likewise upon a 2x4, likewise upon a 1x5 . . . then you see how a tetrahedral array of spheres can also be thought of as layers of square arrays of spheres each nestled in the hollows of the one below it. --Dan The second image, Manipulate[...], illustrates this with 7x1 etc instead of 5x1 etc. The slider controls the number of layers (four shown). You may find it amusing to analyze the actual mechanics of computing the Voronoi figure. %331 is the immediately preceding list of rules. (Why does Save as PNG discard the In and Out numbers?) --rwg On Fri, Jun 21, 2013 at 3:43 AM, Bill Gosper <billgosper@gmail.com> wrote:
I asked Neil if Kepler's sphere-stacking conjecture was about tetrahedral or square pyramids of cannonballs. He fooled with Mathematica briefly and said it doesn't matter <http://gosper.org/kepvor.png>. --rwg
In the past I was always able to use Mma remotely from home, by logging in to my MSRI account with a -X. Now, they've installed Mma 9, and it seems so slow that it is virtually impossible to do any useful work. I've got a fairly fast Wi-Fi connection and never had this problem before. It will take 30 seconds to display a single character I've typed. The sysadmins at MSRI claim that Mma 9 was "not intended to be used remotely" -- i.e., I can't expect them to fix things so it works right. Any suggestions? Thanks, Dan
Use the text-only interface :-/. --Michael On Fri, Jun 21, 2013 at 2:34 PM, Dan Asimov <dasimov@earthlink.net> wrote:
In the past I was always able to use Mma remotely from home, by logging in to my MSRI account with a -X.
Now, they've installed Mma 9, and it seems so slow that it is virtually impossible to do any useful work.
I've got a fairly fast Wi-Fi connection and never had this problem before.
It will take 30 seconds to display a single character I've typed. The sysadmins at MSRI claim that Mma 9 was "not intended to be used remotely" -- i.e., I can't expect them to fix things so it works right.
Any suggestions?
Thanks,
Dan
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Forewarned is worth an octopus in the bush.
Sheesh, I can't even *get* the text-only interface. When the options box finally gets around to opening, it offer +Notebook, +Slide Show, +Other. Clicking on any one of these, if it has any effect at all, takes to long to see a response that any further messing with this setup is clearly a waste of time. On 2013-06-21, at 11:44 AM, Michael Kleber wrote:
Use the text-only interface :-/.
Dan, Can you log in remotely to that system? Then open an x-terminal window Then type math (on most machines it is /usr/common/bin/math ) That should start a command-line version of mathematica On Fri, Jun 21, 2013 at 3:07 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Sheesh, I can't even *get* the text-only interface.
When the options box finally gets around to opening, it offer +Notebook, +Slide Show, +Other.
Clicking on any one of these, if it has any effect at all, takes to long to see a response that any further messing with this setup is clearly a waste of time.
On 2013-06-21, at 11:44 AM, Michael Kleber wrote:
Use the text-only interface :-/.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Dear Friends, I have now retired from AT&T. New coordinates: Neil J. A. Sloane, President, OEIS Foundation 11 South Adelaide Avenue, Highland Park, NJ 08904, USA Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com
Yes! I can use a command-line interface with the command math (which didn't work until this morning, just a minute ago). However, despite logging in with ssh -X I seem to get no graphical output whatsoever on my home machine. E.g., I type Plot[x^2,{x,1,4}] and Mma responds with the character string -Graphics- but it ain't on my machine! --Damn On 2013-06-21, at 12:30 PM, Neil Sloane wrote:
Dan, Can you log in remotely to that system? Then open an x-terminal window Then type math
(on most machines it is /usr/common/bin/math )
That should start a command-line version of mathematica
On Fri, Jun 21, 2013 at 3:07 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Sheesh, I can't even *get* the text-only interface.
When the options box finally gets around to opening, it offer +Notebook, +Slide Show, +Other.
Clicking on any one of these, if it has any effect at all, takes to long to see a response that any further messing with this setup is clearly a waste of time.
On 2013-06-21, at 11:44 AM, Michael Kleber wrote:
Use the text-only interface :-/.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Dear Friends, I have now retired from AT&T. New coordinates:
Neil J. A. Sloane, President, OEIS Foundation 11 South Adelaide Avenue, Highland Park, NJ 08904, USA Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
It will probably show up on your machine after an hour... --Michael On Fri, Jun 21, 2013 at 3:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Yes! I can use a command-line interface with the command
math
(which didn't work until this morning, just a minute ago).
However, despite logging in with
ssh -X
I seem to get no graphical output whatsoever on my home machine.
E.g., I type
Plot[x^2,{x,1,4}]
and Mma responds with the character string
-Graphics-
but it ain't on my machine!
--Damn
On 2013-06-21, at 12:30 PM, Neil Sloane wrote:
Dan, Can you log in remotely to that system? Then open an x-terminal window Then type math
(on most machines it is /usr/common/bin/math )
That should start a command-line version of mathematica
On Fri, Jun 21, 2013 at 3:07 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Sheesh, I can't even *get* the text-only interface.
When the options box finally gets around to opening, it offer +Notebook, +Slide Show, +Other.
Clicking on any one of these, if it has any effect at all, takes to long to see a response that any further messing with this setup is clearly a waste of time.
On 2013-06-21, at 11:44 AM, Michael Kleber wrote:
Use the text-only interface :-/.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Dear Friends, I have now retired from AT&T. New coordinates:
Neil J. A. Sloane, President, OEIS Foundation 11 South Adelaide Avenue, Highland Park, NJ 08904, USA Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Forewarned is worth an octopus in the bush.
Some universities have site licenses for Maple and Mathemaica that allow faculty to download free copies on their home machines. This requires contacting the sysadmin people--who themselves are often not aware of this perk. I have found that contacting the company that makes the product often helps to speed the process. --Edwin On Fri, Jun 21, 2013 at 3:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Yes! I can use a command-line interface with the command
math
(which didn't work until this morning, just a minute ago).
However, despite logging in with
ssh -X
I seem to get no graphical output whatsoever on my home machine.
E.g., I type
Plot[x^2,{x,1,4}]
and Mma responds with the character string
-Graphics-
but it ain't on my machine!
--Damn
On 2013-06-21, at 12:30 PM, Neil Sloane wrote:
Dan, Can you log in remotely to that system? Then open an x-terminal window Then type math
(on most machines it is /usr/common/bin/math )
That should start a command-line version of mathematica
On Fri, Jun 21, 2013 at 3:07 PM, Dan Asimov <dasimov@earthlink.net> wrote:
Sheesh, I can't even *get* the text-only interface.
When the options box finally gets around to opening, it offer +Notebook, +Slide Show, +Other.
Clicking on any one of these, if it has any effect at all, takes to long to see a response that any further messing with this setup is clearly a waste of time.
On 2013-06-21, at 11:44 AM, Michael Kleber wrote:
Use the text-only interface :-/.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Dear Friends, I have now retired from AT&T. New coordinates:
Neil J. A. Sloane, President, OEIS Foundation 11 South Adelaide Avenue, Highland Park, NJ 08904, USA Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Ask them to install Mma 8 in parallel rather than unilaterally upgrade? On Fri, Jun 21, 2013 at 12:34 PM, Dan Asimov <dasimov@earthlink.net> wrote:
In the past I was always able to use Mma remotely from home, by logging in to my MSRI account with a -X.
Now, they've installed Mma 9, and it seems so slow that it is virtually impossible to do any useful work.
I've got a fairly fast Wi-Fi connection and never had this problem before.
It will take 30 seconds to display a single character I've typed. The sysadmins at MSRI claim that Mma 9 was "not intended to be used remotely" -- i.e., I can't expect them to fix things so it works right.
Any suggestions?
Thanks,
Dan
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com
participants (6)
-
Bill Gosper -
Dan Asimov -
Michael Kleber -
Mike Stay -
Neil Sloane -
W. Edwin Clark