From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>

Date: Mon 10 Oct 2005 - 19:06:11 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Oct 10 19:18:56 2005

Date: Mon 10 Oct 2005 - 19:06:11 EST

Leite,Walter wrote:

> Dear R users

*>
**>
**> I am trying to write an R function to solve for a,b,c in the following
**> system of equations, given any value of x1, x2 and x3:
**> b^2 + 6*b*a + 2*c^2 + 15*a^2 = x1
**> 2*c*(b^2 + 24*b*a + 105*a^2 + 2) = x2
**> 24*(b*a + c^2*(1 + b^2 + 28*b*a) + a*(12 + 48 *b*a + 141*c^2 + 225*a^2))
**> =x3
**>
**> Could you give me suggestions about which R function(s) I can use to
**> solve this problem and how I should use these functions?
**> Thank you very much for your assistance,
**>
**> Walter Leite
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
*

R itself cannot calculate symbolically (which is what you want to do it in this case, I guess), "just" numerically.

Uwe Ligges

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Oct 10 19:18:56 2005

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