Results 1 to 6 of 6

Thread: Simultaneous Eq. using Matrices

  1. Apr 5th, 2002, 06:40 AM #1
    sql_lall
    Guest

    Talking Simultaneous Eq. using Matrices

    I know there is a way, but not sure of how it goes, but i have heard of a way you can use a matrix to solve simultaneous equations. Is this right? and if so, how?? (I'm only in yr 10, so keep the Matrix terminology not too complex )
    Reply With Quote Reply With Quote
  2. Apr 5th, 2002, 08:08 AM #2
    kedaman
    kedaman is offline
    transcendental analytic kedaman's Avatar
    Join Date
    Mar 2000
    Location
    0x002F2EA8
    Posts
    7,221
    trough gausselimination of a matrix. Not too simple to explain but basically you subtract a multiple of another row in order to eliminate all but the diagonal (this also means you permutate a row), sometimes you need to switch the rows as well. There's a lot of stuff to read on the net, just search on gausselimination.
    Use
    writing software in C++ is like driving rivets into steel beam with a toothpick.
    writing haskell makes your life easier:
    reverse (p (6*9)) where p x|x==0=""|True=chr (48+z): p y where (y,z)=divMod x 13
    To throw away OOP for low level languages is myopia, to keep OOP is hyperopia. To throw away OOP for a high level language is insight.
    Reply With Quote Reply With Quote
  3. Apr 5th, 2002, 09:39 AM #3
    DavW
    DavW is offline
    Member
    Join Date
    Mar 2002
    Location
    Grimsby (up the Mariners!)
    Posts
    45

    Alternative...

    You can also use matrix inversion to solve simultaneous equations.
    Reply With Quote Reply With Quote
  4. Apr 5th, 2002, 10:25 AM #4
    Guv
    Guv is offline
    Frenzied Member
    Join Date
    Jul 1999
    Location
    Huntingdon Valley, PA 19006
    Posts
    1,151
    Inverting a matrix requires more computations than solving a set of simultaneous equations. Once you have the inverse, you still have more work to do.

    There is at least one thread at this forum which describes gauss elimination. I think it includes some code.
    Live long & prosper.

    The Dinosaur from prehistoric era prior to computers.

    Eschew obfuscation!
    If a billion people believe a foolish idea, it is still a foolish idea!
    VB.net 2010 Express
    64Bit & 32Bit Windows 7 & Windows XP. I run 4 operating systems on a single PC.
    Reply With Quote Reply With Quote
  6. Apr 6th, 2002, 04:50 AM #5
    sql_lall
    Guest

    Talking Thanks

    Thankyou all for your help. I think i'll just search gauss elimination.
    Reply With Quote Reply With Quote
  7. Apr 7th, 2002, 07:01 AM #6
    sql_lall
    Guest

    Exclamation COOL

    Wow, i never realised, but on my Calc (Ti83+), there is an 'rref(matrix)' button, which does it all for you!! COOL!!!
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Click Here to Expand Forum to Full Width