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luby
I want to go back to Philmont!!
Calc Guru
Joined: 23 Apr 2006
Posts: 1477
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 Posted: 09 Nov 2006 03:59:11 pm Post subject: |
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| I have looked and looked and cannot find an equation for solving 4 variables. I was hoping something that could be put on to a calc. |
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Noob88
Member
Joined: 23 Nov 2005
Posts: 239
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| Posted: 09 Nov 2006 04:11:38 pm Post subject: |
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 By "solving 4 variables" do you mean solving an equation such as this?
Ax^3+Bx^2+CX+D=E?
If so, I believe the application Conics has a similar feature that allows you to solve to any degree.
[EDIT]
I gave you the wrong code, I can't seem to find the other one at the moment...
Last edited by Guest on 09 Nov 2006 06:55:51 pm; edited 1 time in total |
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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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| Posted: 09 Nov 2006 05:04:21 pm Post subject: |
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If by four variables you mean w,x,y, and z and you having 4 equations this can be done using a matrix. Create a matrix that looks like this.
[[w x y z ans]
[w x y z ans]
[w x y z ans]
[w x y z ans]]
where each letter is the coefficient in front of the variable.
Then do rref([A] and you will get something like
[[w 0 0 0 0]
[ 0 x 0 0 0]
[ 0 0 y 0 0]
[ 0 0 0 z 0]
where each letter is the amount of the corresponding variable. |
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luby
I want to go back to Philmont!!
Calc Guru
Joined: 23 Apr 2006
Posts: 1477
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| Posted: 09 Nov 2006 09:33:52 pm Post subject: |
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| thanks bannanaman. that's what i was talking about. |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 10 Nov 2006 11:39:09 am Post subject: |
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Except that the output will be more like
[1 0 0 0 w]
[0 1 0 0 x]
[0 0 1 0 y]
[0 0 0 1 z] |
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luby
I want to go back to Philmont!!
Calc Guru
Joined: 23 Apr 2006
Posts: 1477
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| Posted: 10 Nov 2006 07:25:19 pm Post subject: |
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| i knew what he meant |
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