Thread View: sci.math.num-analysis
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Started by Jin J. Chou
Tue, 17 Oct 1995 00:00
Help Needed on Solving Simultaneous Cubic Eqns
Author: Jin J. Chou
Date: Tue, 17 Oct 1995 00:00
Date: Tue, 17 Oct 1995 00:00
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1327 bytes
I have to write a program to solve the following two cubic simultaneous equations in two variables: a1 u^3 + b1 u^2 v + c1 u v^2 + d1 v^3 + e1 u^2 + f1 u v + g1 v^2 + h1 u + i1 v + j1 = 0, a2 u^3 + b2 u^2 v + c2 u v^2 + d2 v^3 + e2 u^2 + f2 u v + g2 v^2 + h2 u + i2 v + j2 = 0, where u, v are variables, ai ... ji, i = 1,2 are real constants. I only care for real roots in [0,1]. I could use some sybolic manipulation tools to combine them into a 9-degree polynomial in one variable and try to solve the single variable polynomial. But I wonder whether there is a better way to do it. I tried several cases in Mathematica. It seems to be able to solve it reasonably well. Any help will be appreciated. Jin Chou -------- jchou@nas.nasa.gov
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