[R] Solving quadratic functions

Peter.Watkins@foodscience.afisc.csiro.au Peter.Watkins at foodscience.afisc.csiro.au
Mon Mar 4 23:37:53 CET 2002

I'm examining the use of the 'lm' function to solve quadratic functions.

With S+ 2000, the 'lm' function can be used to solve eqns such as x1 + x2 +
x1^2 + x2^2 + x1*x2.
But, when trying this same eqn with R, the software does not produce any
coefficients for x1^2 or x2^2.

Is this a common problem? 

I'm using ver. 1.3.1 under Win. 2000.

Thanks, Peter
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