It's hard to go from the acceleration at some time t and velocity at time t, then predict the velocity at time t+1. You might initially think to just do velocity + acceleration*timestep but the trouble is that errors quickly get introduced. Instead you have integrate over the time, numerically
So.. basically, this step means, if I can remember my calculus right, is that you are taking a to be a variable term when you calculate gravity... so you solve the differential equation, numerically, that considers the gravitational attraction and the change in the attraction as the bodies move ever so slightly towards each other.
But even if you have a million stars say, then to calculate the gravitational force between them is a fully connected mesh problem - so that's (n^2+n)/2 = half a trillion. That's a lot of calculations;)
actually, a half a trillion calculations isn't out of reach for a GPU... it's just that solving the differential equations as you described above and doing it for every point on the mesh is real deal breaker.
Thank you very much for your time. I think I actually will write my simple galaxy simulator more so, now, then less!
Of course, it will be open source, so maybe you can laugh it when I finish it!
Culturally, very few "programmers" exist any more that merely get a detailed stack of requirements and just write code for it. Now, you have to be an entrepreneur, and you have to be creative. Fortunately, those of us who survive in the USA are either educated or innately creative, and so, for now, we can do that.
I guess the real question, though, is what field isn't going to be exposed to overseas competition? The only thing I could think of would be a Great Lakes Ship builder, or other professions protected by the Jones Act, but there aren't that many of those jobs out there, any more. Or, you could be in the military!
Could this sort of a simulation work? Just to write for my own education, simulate a simple galaxy?
start out with a 100,000 or a million bodies of varying mass distributed in a rough sphere or some other arbitrary shape, and calculate the gravitational attraction between all of them. You should be able to crunch that in a second or so, if you use a fast computer and SSE to do F=M1*M2/d^2. That would give you the magnitude of an attraction vector basically. From there, you apply the accelerations, keep track of the velocities, and you should see things rolling along. Then, given the velocities, you could throw up a simulated spectrum with the red shift using doppler equations, based upon where you highlight...
Ok, $385 a bottle for a person is a lot to swing, but $385M for the US Government to stockpile a million of these things is chump change. I guarantee shipping a little purifier bottle into a disaster zone would be a lot cheaper than trying to ship in millions of pounds of bottled water or other methods, so it would be cheaper for the gov't.
I think we need to have these, what if the terrorists take out the water. Really, as much as people see the war on terror as a total waste, if rich people are actually willing to fork over taxes and spend gov't bucks on total preparation, I think we'd all do well to invent things like this!
The biggest problem with the Space Shuttle is that it is mounted sideways on the fuel tank, rather than on top, like a "normal" rocket. Were the shuttle "on top", then you wouldn't have the problem of ice and foam whacking the space plane on lift off, which killed one shuttle and its crew, ultimately, and damaged more.
Buran had the same problem.
What Buran excelled in, ironically, was avionics. The Buran could be remotely flown from the ground, so that, they could test it without astronauts. In such a mode, you could decrew the space plane, bring them down in a soyuz, and then remotely fly the buran for a landing. Might lose a vehicle but won't lose the crew.
For example there has been ongoing debate for many years now between people who are searching for dark matter and proponents of MOND.
Just some questions about the above:
a) If MOND is about an extremely small acceleration in F=MA, couldn't that be experimentally verified rather quickly by putting a paperclip a certain distance from the moon or the earth? Or something like that. MOND is something like I would have hacked in CMP252 and seems like it can't possibly be right.
b) I'm assuming that they measure the rotation of a galaxy by looking at its stars red shift? But, what if, for whatever reason, stars farther out from the center of the galaxy just happened to be older / younger, so that, they would have a different color of light but not necessarily be doppler shifted? Or is my understanding of red shift completely wrong - like you know that there ought to be a hydrogen line at a certain spot, but if its moved over, you know what the shift is? Is star light that precisely measured from millions of light years away?
A decade ago, terabytes were a lot more than a thousand bucks, for sure! So, drives have been getting bigger, it's just that, there's been a few releases of Windows along the way!
The nice thing is, from here on out, we can make up pretty much any thing we want to about Microsoft "watching you", and say hey, "how else do they shut your computer off if they think you didn't pay for Windows!"
Is that, the disabler effectively steals all of the data on the consumer's hard drive. Say, I have a bunch of word documents, and suddenly, the OS is disabled. Well, I can't get to my documents now, can I. So, Microsoft stole my documents. It's like, you might repo my car, if I don't pay for it, but that doesn't give you the rights to the stuff inside it, which I can get at the repo lot.
When it really boils down to it, I would almost expect the disable feature to be the largest class action lawsuit in history against Microsoft, even in the USA. Even though, in general, I'm against this sort of big money class action lawsuits, I think Microsoft's heavy handed of theft of consumer data warrants it.
Let's see, in order to chase after a few retailers, Microsoft suddenly turns off the computer for potentially thousands, if not millions of people? Yep, that's going to win them a lot of friends. I would expect that some countries might just make this sort of thing illegal.
Your digitally signed web browser/HTML protocol idea was especially laughable
Really? Let's try this architecture. The gist is, I carve out my own little space on the Internet with guaranteed ad showing, protection from download copying, and digital rights management. To do this, I must:
Make a web browser, all of my own. I probably want to simplify / change HTML to move, as you say, from a generic content, to a content model that is more useable, and also, to cheaply sweeten the pie for the retailers I'm trying to entice:
a) add support for ALL the Windows Common controls to the page - like, the tree, the listview, all of them. b) embrace the table! c) add support to the web browser so that images can't be downloaded from the platform d) everything always https. Basically, I want to lock out people sniffing in midstream. e) add html tags to support the notion of a shopping item and a basket, and build the basket into the browser.
Also, instead of binding web sites to my own DNS, a web site host would have to buy the name from my platform. But if I made the process cheap enough, that could work. Then, there would be an approval process for not letting every web site get in, and, as a side effect, I could offer my own search services from within the browser.
Then, with my offering, I turn around to various online e-tailers and say hey, if you support this browser, we won't block your ads, and we won't screw up your site, and we won't allow price comparison scrapers and all the other shit you have to put up with. I get a few retailers in each consumer segment, a car company or two, and then I'm off to the races with an IPO for a few billion dollars.
From there, I advertise my browser on TV, and then I sell out my whole thing to Google or Microsoft and retire building spaceships and maybe buying the Phillies a fricking pitcher!
a) your ads won't be blocked b) we can slot you into space for products c) we hold web sites to high standards d) we can integrate your offers directly into our browser.
and then to consumers I can say:
we've created a space where there's no malware, no spyware, no popup or malicious sites, no link farms, and you can choose to surf there for free, or, you can keep surfing on the regular internet - hope your anti-virus software is up to date!
If things weren't so horribly intrusive and capable of tracking a user's entire internet experience, for the sole purpose of selling you stuff, people wouldn't bitch.
Don't go to the site then, and for sure, don't use their content!
What are you, like little mommy's boy waiting for the world to dance for you, for free, every time you simper and lose your blanky! Hey, people eat and want to send their kids to college.
Honestly, what they should do is make it so that a web browser / html protocol that is digitally signed so that ads -cannot be blocked-.
I seem to remember that in Pascal, in order to pass a string from one function to another, they had to be declared to be of the same length. That was back in Turbo Pascal for DOS days, and maybe they fixed that up by then.
Seriously, if IE were truly a seperate process, then, why can't I run it under another user account, the same way I can just about every other process in Windows XP.
Forget Millenium, IE just not genuinely a separate process under Windows XP! It just isn't. If it was, it could run in its own security context, you know, like how most programs can under Linux!
Give it up dude. IE's market share is declining, and Firefox is gaining, and that's because consumers are choosing a browser that works over one that doesn't.
Internet Explorer has experienced a problem or error. As a precaution, your Active Desktop has temporarily been turned off. To start the Active Desktop again, use the following troubleshooting tips
I don't know that people would switch to BSD because of a licensing issue. Most people use Linux as a client and probably don't care about the licenses. I don't see how BSD can keep up with the torrent of drivers coming out for Linux at this point. Sure, if there was a BSD that recognized my graphics card, sound card, and all my other goodies, I'd be up for it, but I'd hate to have to go back in time again just because of a licensing consideration. And then, what compiler would I use? Gee, GNU!!!!
IExplore is only a U/I wrapper around a collection of objects that IE exposes. Some of those objects are used by the shell. This is why Microsoft walked into court, correctly, and said that IE was a part of the operating system, and, if you got rid of everything that was truly a part of IE, the desktop would not work. But, hey, that's just Microsoft saying that.... I'm just going by what Bill Gates, Steve Ballmer and all the other guys said at the Netscape trial, and continue to say...
"It's all integrated!!!" So be it. And Firefox is better, because it's NOT.
Why are you implying that German people are better than Spanish people? It's not the country of origin that is the problem, it is the method of entry. Your whole argument is "how dare you assume that I'm spanish, when I'm really german, and therefor, I am a racist." Sorry, I'm not going to fall into your racist nonsense. If your family is German or Spanish and is in the USA illegally, then, off to the Deportation land with you! Race is NOT a factor.
My post and my family have nothing to do with illegal immigrants however racists
You know, that's enough. You can go on and call me racist as much as you want, but, given that 30 million people in the USA are estimated to be here illegally, its pretty reasonable to think that someone who doesn't "look like us" might actually be an illegal immigrant. Illegal immigration dwarfs legal immigration by a fairly wide margin.
I mean seriously.. if you see a gang of people in an aging Ford Econline Van without license plates, I think it is reasonable to ask if the people there are here legally. It's just an epidemic. I'm sorry you got caught in the crossfire, and it was wrong for people to accost you the way you did, but suspecting someone might be here illegally is really, the most logical course of action until this country secures its borders properly.
Really, its just that simple. IE is prone to locking up, and when it does, it brings down your whole Windows desktop because it is "built into" Windows. Firefox doesn't have that problem. First off, it tends to work more often, and on a wide variety of sites.
That's the whole point. It is against the law to enter the USA without following certain procedures, and therefor, those that do not follow those procedures, are breaking the law, and are criminals. It's pretty cut and dry.
Slashdot Mirror
Hell, with that kind of ISP, why even explore Mars, when we can INVADE IT!
It's hard to go from the acceleration at some time t and velocity at time t, then predict the velocity at time t+1. You might initially think to just do velocity + acceleration*timestep but the trouble is that errors quickly get introduced. Instead you have integrate over the time, numerically
;)
So.. basically, this step means, if I can remember my calculus right, is that you are taking a to be a variable term when you calculate gravity... so you solve the differential equation, numerically, that considers the gravitational attraction and the change in the attraction as the bodies move ever so slightly towards each other.
But even if you have a million stars say, then to calculate the gravitational force between them is a fully connected mesh problem - so that's (n^2+n)/2 = half a trillion. That's a lot of calculations
actually, a half a trillion calculations isn't out of reach for a GPU... it's just that solving the differential equations as you described above and doing it for every point on the mesh is real deal breaker.
Thank you very much for your time. I think I actually will write my simple galaxy simulator more so, now, then less!
Of course, it will be open source, so maybe you can laugh it when I finish it!
Culturally, very few "programmers" exist any more that merely get a detailed stack of requirements and just write code for it. Now, you have to be an entrepreneur, and you have to be creative. Fortunately, those of us who survive in the USA are either educated or innately creative, and so, for now, we can do that.
I guess the real question, though, is what field isn't going to be exposed to overseas competition? The only thing I could think of would be a Great Lakes Ship builder, or other professions protected by the Jones Act, but there aren't that many of those jobs out there, any more. Or, you could be in the military!
Right. You take light from a telescope...
Could this sort of a simulation work? Just to write for my own education, simulate a simple galaxy?
start out with a 100,000 or a million bodies of varying mass distributed in a rough sphere or some other arbitrary shape, and calculate the gravitational attraction between all of them. You should be able to crunch that in a second or so, if you use a fast computer and SSE to do F=M1*M2/d^2. That would give you the magnitude of an attraction vector basically. From there, you apply the accelerations, keep track of the velocities, and you should see things rolling along. Then, given the velocities, you could throw up a simulated spectrum with the red shift using doppler equations, based upon where you highlight...
Ok, $385 a bottle for a person is a lot to swing, but $385M for the US Government to stockpile a million of these things is chump change. I guarantee shipping a little purifier bottle into a disaster zone would be a lot cheaper than trying to ship in millions of pounds of bottled water or other methods, so it would be cheaper for the gov't.
I think we need to have these, what if the terrorists take out the water. Really, as much as people see the war on terror as a total waste, if rich people are actually willing to fork over taxes and spend gov't bucks on total preparation, I think we'd all do well to invent things like this!
The biggest problem with the Space Shuttle is that it is mounted sideways on the fuel tank, rather than on top, like a "normal" rocket. Were the shuttle "on top", then you wouldn't have the problem of ice and foam whacking the space plane on lift off, which killed one shuttle and its crew, ultimately, and damaged more.
Buran had the same problem.
What Buran excelled in, ironically, was avionics. The Buran could be remotely flown from the ground, so that, they could test it without astronauts. In such a mode, you could decrew the space plane, bring them down in a soyuz, and then remotely fly the buran for a landing. Might lose a vehicle but won't lose the crew.
For example there has been ongoing debate for many years now between people who are searching for dark matter and proponents of MOND.
Just some questions about the above:
a) If MOND is about an extremely small acceleration in F=MA, couldn't that be experimentally verified rather quickly by putting a paperclip a certain distance from the moon or the earth? Or something like that. MOND is something like I would have hacked in CMP252 and seems like it can't possibly be right.
b) I'm assuming that they measure the rotation of a galaxy by looking at its stars red shift? But, what if, for whatever reason, stars farther out from the center of the galaxy just happened to be older / younger, so that, they would have a different color of light but not necessarily be doppler shifted? Or is my understanding of red shift completely wrong - like you know that there ought to be a hydrogen line at a certain spot, but if its moved over, you know what the shift is? Is star light that precisely measured from millions of light years away?
A decade ago, terabytes were a lot more than a thousand bucks, for sure! So, drives have been getting bigger, it's just that, there's been a few releases of Windows along the way!
The nice thing is, from here on out, we can make up pretty much any thing we want to about Microsoft "watching you", and say hey, "how else do they shut your computer off if they think you didn't pay for Windows!"
Is that, the disabler effectively steals all of the data on the consumer's hard drive. Say, I have a bunch of word documents, and suddenly, the OS is disabled. Well, I can't get to my documents now, can I. So, Microsoft stole my documents. It's like, you might repo my car, if I don't pay for it, but that doesn't give you the rights to the stuff inside it, which I can get at the repo lot.
When it really boils down to it, I would almost expect the disable feature to be the largest class action lawsuit in history against Microsoft, even in the USA. Even though, in general, I'm against this sort of big money class action lawsuits, I think Microsoft's heavy handed of theft of consumer data warrants it.
Let's see, in order to chase after a few retailers, Microsoft suddenly turns off the computer for potentially thousands, if not millions of people? Yep, that's going to win them a lot of friends. I would expect that some countries might just make this sort of thing illegal.
Your digitally signed web browser/HTML protocol idea was especially laughable
Really? Let's try this architecture. The gist is, I carve out my own little space on the Internet with guaranteed ad showing, protection from download copying, and digital rights management. To do this, I must:
Make a web browser, all of my own. I probably want to simplify / change HTML to move, as you say, from a generic content, to a content model that is more useable, and also, to cheaply sweeten the pie for the retailers I'm trying to entice:
a) add support for ALL the Windows Common controls to the page - like, the tree, the listview, all of them.
b) embrace the table!
c) add support to the web browser so that images can't be downloaded from the platform
d) everything always https. Basically, I want to lock out people sniffing in midstream.
e) add html tags to support the notion of a shopping item and a basket, and build the basket into the browser.
Also, instead of binding web sites to my own DNS, a web site host would have to buy the name from my platform. But if I made the process cheap enough, that could work. Then, there would be an approval process for not letting every web site get in, and, as a side effect, I could offer my own search services from within the browser.
Then, with my offering, I turn around to various online e-tailers and say hey, if you support this browser, we won't block your ads, and we won't screw up your site, and we won't allow price comparison scrapers and all the other shit you have to put up with. I get a few retailers in each consumer segment, a car company or two, and then I'm off to the races with an IPO for a few billion dollars.
From there, I advertise my browser on TV, and then I sell out my whole thing to Google or Microsoft and retire building spaceships and maybe buying the Phillies a fricking pitcher!
I could go to any web site, and say,
a) your ads won't be blocked
b) we can slot you into space for products
c) we hold web sites to high standards
d) we can integrate your offers directly into our browser.
and then to consumers I can say:
we've created a space where there's no malware, no spyware, no popup or malicious sites, no link farms, and you can choose to surf there for free, or, you can keep surfing on the regular internet - hope your anti-virus software is up to date!
If things weren't so horribly intrusive and capable of tracking a user's entire internet experience, for the sole purpose of selling you stuff, people wouldn't bitch.
Don't go to the site then, and for sure, don't use their content!
What are you, like little mommy's boy waiting for the world to dance for you, for free, every time you simper and lose your blanky! Hey, people eat and want to send their kids to college.
Honestly, what they should do is make it so that a web browser / html protocol that is digitally signed so that ads -cannot be blocked-.
I seem to remember that in Pascal, in order to pass a string from one function to another, they had to be declared to be of the same length. That was back in Turbo Pascal for DOS days, and maybe they fixed that up by then.
Seriously, if IE were truly a seperate process, then, why can't I run it under another user account, the same way I can just about every other process in Windows XP.
Forget Millenium, IE just not genuinely a separate process under Windows XP! It just isn't. If it was, it could run in its own security context, you know, like how most programs can under Linux!
Give it up dude. IE's market share is declining, and Firefox is gaining, and that's because consumers are choosing a browser that works over one that doesn't.
Internet Explorer has experienced a problem or error. As a precaution, your Active Desktop has temporarily been turned off. To start the Active Desktop again, use the following troubleshooting tips
I don't know that people would switch to BSD because of a licensing issue. Most people use Linux as a client and probably don't care about the licenses. I don't see how BSD can keep up with the torrent of drivers coming out for Linux at this point. Sure, if there was a BSD that recognized my graphics card, sound card, and all my other goodies, I'd be up for it, but I'd hate to have to go back in time again just because of a licensing consideration. And then, what compiler would I use? Gee, GNU!!!!
Open a big PDF in IE, then, smarty!
IExplore is only a U/I wrapper around a collection of objects that IE exposes. Some of those objects are used by the shell. This is why Microsoft walked into court, correctly, and said that IE was a part of the operating system, and, if you got rid of everything that was truly a part of IE, the desktop would not work. But, hey, that's just Microsoft saying that.... I'm just going by what Bill Gates, Steve Ballmer and all the other guys said at the Netscape trial, and continue to say...
"It's all integrated!!!" So be it. And Firefox is better, because it's NOT.
Funny! "In advance even"... that's awesome.
Why are you implying that German people are better than Spanish people? It's not the country of origin that is the problem, it is the method of entry. Your whole argument is "how dare you assume that I'm spanish, when I'm really german, and therefor, I am a racist." Sorry, I'm not going to fall into your racist nonsense. If your family is German or Spanish and is in the USA illegally, then, off to the Deportation land with you! Race is NOT a factor.
My post and my family have nothing to do with illegal immigrants however racists
You know, that's enough. You can go on and call me racist as much as you want, but, given that 30 million people in the USA are estimated to be here illegally, its pretty reasonable to think that someone who doesn't "look like us" might actually be an illegal immigrant. Illegal immigration dwarfs legal immigration by a fairly wide margin.
I mean seriously.. if you see a gang of people in an aging Ford Econline Van without license plates, I think it is reasonable to ask if the people there are here legally. It's just an epidemic. I'm sorry you got caught in the crossfire, and it was wrong for people to accost you the way you did, but suspecting someone might be here illegally is really, the most logical course of action until this country secures its borders properly.
Really, its just that simple. IE is prone to locking up, and when it does, it brings down your whole Windows desktop because it is "built into" Windows. Firefox doesn't have that problem. First off, it tends to work more often, and on a wide variety of sites.
That's the whole point. It is against the law to enter the USA without following certain procedures, and therefor, those that do not follow those procedures, are breaking the law, and are criminals. It's pretty cut and dry.