Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror

Comment Re:Cool! (Score 1) 434

>For example, why build a detector that is only sensitive to waves of 100 units or larger if the models say the actual waves should only be 2 units of size?

The wave magnitude is a function of distance.An actual wave of 2 would be 100 if the source were closer.

The LIGO upgrade increased the diameter of the sphere in which it can detect specific events. It could have detected something beforehand if they got lucky. If it was in operation in 1987, they would have seen 1987A clearly. A linear increase in sensitivity leads to a square increase in sphere volume which leads to a square increase in the probability of detecting a event. Hopefully they get to do another upgrade and get lots of events.

Comment Re: Cool! (Score 1) 434

However, scientific theories are only good until a more refined one comes along.

Nope. Newton's laws do just fine for day to day engineering. Maxwell's equations too.
Newer scientific theories may be better as a description of reality, but you can't simulate a circuit by running QM equations. It isn't practical. QM sucks when you need to get shit done.

Comment Re:Lifespan of Tech books... (Score 1) 119

Considering the "useful lifespan" of tech books varies from 3 to 5 years, ALL such older books should become free PDF downloads. "Fun with Your Apple ][", "Windows 98 for Dummies" and "Solaris 2.x for Managers" are completely obsolete. Almost all the Python 2 books become antiques with Python 3 growing - ok, maybe not the best example (but better than Perl 6 which has been 20 years in Promiseland). Most often, by now, the hardware to run the examples is dead and the compilers or software very hard to find.

I still need my Apple ][ reference manual to remind me of the memory map in my Apple ][. I remember books that existed back then that seem to have been lost to entropy.

Comment Re:Wasn't the C64 just a BASIC interpreter anyways (Score 1) 119

That is a really good point that I overlooked. When I wrote BASIC on the C64 I didn't go nearly that far (but that says lots about how little I did with BASIC on the C64 and nothing about doing anything clever to not need those features). That said, if these were "programming for kids" type books would they go to that level?

Follow the link and read the book on machine code. Yes it goes to that level.

Comment Re:Wasn't the C64 just a BASIC interpreter anyways (Score 1) 119

Notably, there were no graphics and sound primitives whatsoever in C64 BASIC. If you wanted to take advantage of the (actually quite impressive, for the day) graphics and sound, you had to directly manipulate memory.

Fortunately, you could get excellent books on machine code for 6502 CPUs, written in a style that would appeal to children.
These days you get scratch.

Comment Re:Yes (Score 1) 119

I'd love free copies of The Art of Programming by Knuth, or any of the K, R, or P books. Maybe even Bjorne.

I found TAOP in a bookshop in Seattle last week for two hundred and something dollars. I resisted buying it, because I had other things to spend the money on. Free would have been nice, but I don't think they'll be giving it away any time soon.

Slashdot Top Deals

It is not well to be thought of as one who meekly submits to insolence and intimidation.

Working...