| |
| |
| |
|
Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Comments:
<0> balrog-kun: now imagine if you rotate that curve about the X-axis to make the cone I was telling you about
<0> balrog-kun: can you imagine that?
<1> okay
<1> i think so :)
<2> keep getting coasters
<2> bloody annoying
<0> balrog-kun: great, now let's say you want to make the airplane nose 4 meters long
<0> and you want to know the volume inside that cone
<0> how do you get the volume?
<1> 4 meters in y axis?
<1> hmm... i knew some method to do this... :p
<0> sqrt(x) is going to give you something like a curve starting at zero and going to the right and up correct?
<1> you had to devide sqrt(x) by some other function and get the derivative value at 4 and at 0
<1> *divide
<1> yes
<0> err, there are a few methods to get the volume. but it's not really derivation, but rather integration..
<0> anyway
<0> now .. this curve is going right and up like a bow or something
<1> yes
<0> imagine holding it with your hand and spinning it around the X-axis
<0> X is the horizontal axis :)
<1> ok
<0> this would give you the cone
<0> so the cone starts at 0 and ends at 4 where the width of the cone at 4 is simply 2 * sqrt(4)
<0> 2 because you're measuring from up till down across the X-axis
<0> Now here is the interesting part
<1> yep
<0> you can find the volume in two popular ways (and many others)
<0> in the disk method ...
<0> imagine grabbing that cone and slicing it from left to right
<0> you will get disks (to the left the disks are shorter and to the right the disks are taller)
<1> ah, yep
<0> the volume of each of these infinitely small disks is Pi r^2 :) basic stuff right
<0> what is r? it is sqrt(x)
<1> mmm
<1> pi r^2 would be the volume of a width 1 disc
<0> now, all that we need to do is add all of these disk volumes together and we will get the cone's volume
<1> ah, yes
<1> i get it now :)
<0> so .. limit -> infinity of sum .. what is that .. why it's Integration :) ding ding
<1> heh, i see it now
<1> it's the definition of integration.. kindof
<0> so .. Integral[Pi (Sqrt(x))^2 dx, x, 0, 4]
<0> and you got the volume of the cone :)
<1> but you don't think about the definition when you deal with normal equations
<0> now, what if the cone has a thickness (the airplane nose is not made out of thin paper)
<1> yeah
<1> hmm
<0> then you simply integrate the top (outer) from the bottom disk (inner) and you will get the volume of the cone while excluding the inner stuff
<1> true
<3> Of course, even a thickness of paper has...well, thickness :)
<0> so you will add up not disk, but more like CD-ROM shapes while integrating if you can imagine that
<0> becauseyou have a hole in the middle
<0> and that's why they call it the disk method :)
<1> heh, ok
<0> pretty cool stuff :) they just tell you look at the shape a given way, and imagine how you slice it. If you slice it one way, you get the disk method, if you slice it another way, you get the shell method, and so on
<0> actually, most of the time .. the shell method is just perpindicular to the disk method
<0> so for our example. you will integrate across the Y not the X axis, using the f(x)^-1 (inverse of f(x))
<0> this way, the shape will be sliced into shells (like an onion from the outside to the inside
<0> did I confuse you :)?
<1> not much :)
<0> cool, you agree that it's a cool method isn't it?
<1> yeah,
<1> i didn't know it had names like disk and shell
<0> close your eyes and imagine cutting the cone from left to right, and _peeling_ it from top to bottom
<1> makes it easier to learn i guess
<4> Hi all. How can I ftp hole dir and all its subfolders at once?
<0> you will see that you get something like shells and disks
<0> error_name: you can't, you either write a script or use scp
<4> Cognition: what is scp?
<0> another protocol for copying files
<0> man scp
<4> thanks
<1> you could use "mput" maybe
<1> it's an ftp command
<4> I am an absolute linux n00b.
<4> if some1 could help on priv would be much appriciated
<0> error_name: are you on a command line or GUI?
<4> command line troug ssh
<0> error_name: ok .. scp makes things real easy
<4> I need to move folder /home/tabbertadmin/largo/demo to ftp://server/wwwroot
<5> I have a problem with my mail queue not clearing...i delete the contents of /var/spool/mqueue and it puts it back in...where is it reloading this info from?
<6> Good afternoon everyone.
<5> anyone
<0> error_name: please don't message in private without consent
<0> error_name: you can try something like scp -r /home/tabbertadmin/largo/demo username@host:/target/destinationhere
<0> ***uming that the target destination has SSH (which I ***ume it does because you're SSHed to it
<4> sorry
<4> and thanks
<4> Cognition: should it display something after i hit enter?
<0> it should ask for a p***word if you need one
<7> I have a avi file that I cant seem to run in any media player in fedora
<7> I downloaded all the codex into a folder
<4> Cognition: [mountaindew]$ scp -r /home/tabbertadmin/larson-bg.com/demo miro_bs@ftpmiro_bs.win.aplus.net:/miro_bs/WWWROOT/
<7> anybody any ideas
<4> and it stays like that
<4> without asking for a p***word (and it should)
<0> do you have the correct host name, username, and directory?
<7> mplayer is crap :(
<0> andyG: you have 1) a corrupt file 2) you did not install the codecs
<0> andyG: mplayer is the only media player that never failed to play any file of any type that I gave it.
<7> I downloded the codecs, unzipped them to a directory....my avi is fine cos its ok on linux
<7> on windows I mean
<8> compile ?
<0> andyG: you don't just unzip the codecs, you need to put them in the correct place!
<7> so how do I install these codecs? I unzipped them to a file
<7> ah ok
<7> where do they go ?
<9> andyG: /usr/lib/codecs or /usr/lib/win32
<9> andyG: it depends on how your mplayer was configured
<4> Cognition: yes it is the correct host name, username, and directory
<0> error_name: what happens after you hit enter?
<7> is there something I can look at that will tell me where mplayer expects them ?
<4> Cognition: it was trying to connect to port 22 instead of 21
<0> error_name: that's the correct port
<9> error_name: you can't use scp with ftp servers :/
<0> wait a minute
<7> iddqd: how do I know where to put my codecs ?
<4> Well i need to put it to FTP server as I stated earlier
<4> :(
<0> error_name: is the remote server an FTP server only?
<10> good morning
<4> yep
<0> no ****!
<10> err
<0> does anybody have a gun here?
<4> or atlease it timeouts on 22
<4> its a hosting account
<9> error_name: just put them in /usr/lib/codecs and link this directory to /usr/lib/win3 /lib/codecs /lib/win32 /usr/local/codecs /usr/local/win32
<9> oops, i mean andyG
<7> :)
<4> ^_^
<0> error_name: ok, since this is an ftp server, you need to write a loop to copy all the files
<0> I don't know of any other way to copy recursively on FTP servers
<9> Cognition: not really :)
<4> I have no idea how to do it :D
<9> andyG: lftp you@server
<9> arghh
<9> :(
<0> LOL
<9> error_name: lftp you@server
<0> iddqd: you need coffee
<9> Cognition :)
<9> error_name: and then mput /path/to/dir
<0> hmm, I don't even have lftp
<0> hmmm
<0> kewl
<7> iddqd: I put my codecs in /usr/local/codecs
<0> never knew that was possible, I always wrote stupid loops
Return to
#linux
or
Go to some related
logs:
bhulo badhu biju badhu
#india
#india
#kl
#allnitecafe
bbbvbv
#linux
#java
pakistan earth queake
Call to undefined function html_entities_decode()
|
|