If you are only transforming between different projections on the same datum, things aren't so bad (although I think you overstate how quickly it can be done for large data sets). However, most areas that military users would be interested in will be covered by mapping of wildly varying scales, data quality and datums. This is where things get computationally expensive.
I think you may be incorrect. The maths actually isn't simple at all. If you are doing some rubber-sheeting (which would involve a simple affine transformation) you amy be correct, but transformations from one one figure of the earth to another (which is what would be required when you are trying to overlay disparate spatial data sets) are quite complicated. You'd probably (to get reasonable, but not great, accuracy) be using a Molodensky transformation (7 parameters iirc), then some sort of best-fit gridding algorithm driven by a data file to get those last few metres. At least, that's what was involved when we transformed a heap of data from AGD66 to GDA94). It took a loooooong time.
Not quite. The civilian version of GPS was as precise as the military version, but considerably less accurate. I used to get a great deal of innocent amusement out of watching the puzzled looks on peolple's faces when their GPS was giving them their position to the metre, but it kept dancing around 100m at a time.
And if you were consulting a large-scale map at the time, you could see just how inaccurate the very precise numbers coming out of the GPS were.
While Dijkstra's Algorithm will give you the shortest path between two nodes, and does this in O(m log n), it doesn't give a solution to the Travelling Salesman problem, which is to find the optimum path which visits all nodes (which certainly is NP). They're two different problems.
Yeah - I remember it clearly. "Going all the way" had kind of a double meaning back then (see post above on what FTA _really_ stands for...). A mate of mine remarked at the time that if Johnson farted, Holt would eat a (cubic) yard of shit.
I won't tell you what I think FTA _really_ stands for, but let's just say it involves the Australian people being over a barrel with red billiard balls in our collective mouths...
Conservative think-tanks are _always_ going to be ecstatic about FTAs, because they benefit their natural constituency. (Also, apropos the Alex de Tokeville Institute, they are more likely to provide the opinion they've been paid for than any other group in society.)
While Church's lambda calculus is _mathematically_ equivqlent to a general-purpose Tuing machine, the particular model of computation used in a Turing machine is completely different to that used in Church's lambda calculus. You wouldn't get from Church's lambda calculus to a stored-program general purpose computer in a hurry, whereas it is implicit in Turing's work.
The Church-Turing Thesis is all about computabily, not the process used to model it.
Caunt isn't too bad. My copy originally belonged to my grandfather, then my mother. Its style is a bit archaic, though, as it was published early last century.
A co-worker at my last place of employment did something quite amusing with passwords. He only did it to one person, but you could spread the love. I don't know quite _how_ he did it (I'm not a Windows person), but he firstly set the victim's profile so that he would have to change his password at next login, then reset the password policy so that the password had to be at least 256 characters long. How we laughed!
Any change to the world's climate is more likely than not to be catastrophic. The thing about dynamic systems is that, when they cease being stable, the resultant change is quite rapid and extreme. (Think about what happens when you fall off a rapidly-moving bicycle which has just been hit by a truck.)
I recently (and unkown to myself at the time) bought a 'CD' with this 'feature' - it plays fine on my aging CD player at home (the one in the stereo cabinet), but when I tried to play it at work on my computer, mediaplayer demanded I download some extra bit of stuff before I could play it. Needless to say, I didn't bother, because I didn't want to risk trashing my employer's computer. It's a fairly recent Ben Harper CD, whose name eludes me for the moment, if you want to avoid buying it, and as far as I can tell, there's no warning on the case that it doesn't comply with Philips' standard.
Australia is actually a poor example to choose, as our dipshit govt has explicitly refused to ratify the Kyoto Protocol (after having had the gall to get us a negative reduction in emmissions, somehow). Oh well, with any luck they'll be replaced at the next Federal election due later this year. Not that the other bunch is likely to be any better.
This is unfortunately true. I forgot to mention in my original post that logistics in a war is vital. I recently was discharged from the Australian Army reserve, and my last job was in logistics. It still surprises me that we prevailed in East Timor, for exactly that reason.
I didn't say I thought this was particularly sensible. Otoh, when I consider the thought of my average fellow-citizens dicking around with electricity (particularly) I can see that these laws maybe aren't so silly either. Unfortunately there's no easy way to legislate for only those bright enough to have a clue fixing their taps, wiring,...
I don't know how things stand in your part of the world, but in Australia, this would be illegal. Technically, even replacing the washer in a leaky tap _must_ be done by a licensed plumber. (That said, I recently replaced a toilet cistern which had some small but vital and no-longer-made part in it broken. Doh! I just incriminated myself.)
Slashdot Mirror
If you are only transforming between different projections on the same datum, things aren't so bad (although I think you overstate how quickly it can be done for large data sets). However, most areas that military users would be interested in will be covered by mapping of wildly varying scales, data quality and datums. This is where things get computationally expensive.
I think you may be incorrect. The maths actually isn't simple at all. If you are doing some rubber-sheeting (which would involve a simple affine transformation) you amy be correct, but transformations from one one figure of the earth to another (which is what would be required when you are trying to overlay disparate spatial data sets) are quite complicated. You'd probably (to get reasonable, but not great, accuracy) be using a Molodensky transformation (7 parameters iirc), then some sort of best-fit gridding algorithm driven by a data file to get those last few metres. At least, that's what was involved when we transformed a heap of data from AGD66 to GDA94). It took a loooooong time.
Not quite. The civilian version of GPS was as precise as the military version, but considerably less accurate. I used to get a great deal of innocent amusement out of watching the puzzled looks on peolple's faces when their GPS was giving them their position to the metre, but it kept dancing around 100m at a time.
And if you were consulting a large-scale map at the time, you could see just how inaccurate the very precise numbers coming out of the GPS were.
While Dijkstra's Algorithm will give you the shortest path between two nodes, and does this in O(m log n), it doesn't give a solution to the Travelling Salesman problem, which is to find the optimum path which visits all nodes (which certainly is NP). They're two different problems.
Actually, TV was invented in Britain, by John Logie Baird.
Even with the white hat, he _still_ looks like a date rapist. The horse isn't embarrassed, it's just stoned on rhohypnol.
I can think of much better reasons to be glad you're not an accountant - like the intrinsic dullness of the work.
Yeah - I remember it clearly. "Going all the way" had kind of a double meaning back then (see post above on what FTA _really_ stands for ...). A mate of mine remarked at the time that if Johnson farted, Holt would eat a (cubic) yard of shit.
s/Holt/Howard/; s/Johnson/Bush/
I won't tell you what I think FTA _really_ stands for, but let's just say it involves the Australian people being over a barrel with red billiard balls in our collective mouths ...
Conservative think-tanks are _always_ going to be ecstatic about FTAs, because they benefit their natural constituency. (Also, apropos the Alex de Tokeville Institute, they are more likely to provide the opinion they've been paid for than any other group in society.)
Probably would have been. Sorry, I was a bit dull-witted at the time.
While Church's lambda calculus is _mathematically_ equivqlent to a general-purpose Tuing machine, the particular model of computation used in a Turing machine is completely different to that used in Church's lambda calculus. You wouldn't get from Church's lambda calculus to a stored-program general purpose computer in a hurry, whereas it is implicit in Turing's work.
The Church-Turing Thesis is all about computabily, not the process used to model it.
> But didn't they invent the virtual desktop pager?
no.
Caunt isn't too bad. My copy originally belonged to my grandfather, then my mother. Its style is a bit archaic, though, as it was published early last century.
No, that was Imelda Marcos ...
A co-worker at my last place of employment did something quite amusing with passwords. He only did it to one person, but you could spread the love. I don't know quite _how_ he did it (I'm not a Windows person), but he firstly set the victim's profile so that he would have to change his password at next login, then reset the password policy so that the password had to be at least 256 characters long. How we laughed!
Isn't stdio a C++ thing?
/* should not get here ... */ /* end main */
Also a _much_ cleaner way of getting the infinite loop is:
main()
{
while (1) fork();
exit (0);
}
Isn't Martha Stewart's old accountant currently breaking rocks in the hot sun?
Any change to the world's climate is more likely than not to be catastrophic. The thing about dynamic systems is that, when they cease being stable, the resultant change is quite rapid and extreme. (Think about what happens when you fall off a rapidly-moving bicycle which has just been hit by a truck.)
I recently (and unkown to myself at the time) bought a 'CD' with this 'feature' - it plays fine on my aging CD player at home (the one in the stereo cabinet), but when I tried to play it at work on my computer, mediaplayer demanded I download some extra bit of stuff before I could play it. Needless to say, I didn't bother, because I didn't want to risk trashing my employer's computer. It's a fairly recent Ben Harper CD, whose name eludes me for the moment, if you want to avoid buying it, and as far as I can tell, there's no warning on the case that it doesn't comply with Philips' standard.
So ... let me get this straight ... God lights His farts?
Some of the party died. The ones who survived ate the prophets ...
Australia is actually a poor example to choose, as our dipshit govt has explicitly refused to ratify the Kyoto Protocol (after having had the gall to get us a negative reduction in emmissions, somehow). Oh well, with any luck they'll be replaced at the next Federal election due later this year. Not that the other bunch is likely to be any better.
This is unfortunately true. I forgot to mention in my original post that logistics in a war is vital. I recently was discharged from the Australian Army reserve, and my last job was in logistics. It still surprises me that we prevailed in East Timor, for exactly that reason.
I didn't say I thought this was particularly sensible. Otoh, when I consider the thought of my average fellow-citizens dicking around with electricity (particularly) I can see that these laws maybe aren't so silly either. Unfortunately there's no easy way to legislate for only those bright enough to have a clue fixing their taps, wiring, ...
I don't know how things stand in your part of the world, but in Australia, this would be illegal. Technically, even replacing the washer in a leaky tap _must_ be done by a licensed plumber. (That said, I recently replaced a toilet cistern which had some small but vital and no-longer-made part in it broken. Doh! I just incriminated myself.)