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Version 2.1.1  (2005-06-20), ISBN 3-900051-07-0

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>  # chex32.r                    J F Monahan August 2007
>  #
>  # Example 3.2 Solve a general system of linear equations
>  #
>   A <- matrix( c(1,.5,0,1, 2,1,2,-1, -1,0,-.5,1.5, 0,1,1.5,0), 4, 4)
>  #  write it out
>   A
     [,1] [,2] [,3] [,4]
[1,]  1.0    2 -1.0  0.0
[2,]  0.5    1  0.0  1.0
[3,]  0.0    2 -0.5  1.5
[4,]  1.0   -1  1.5  0.0
>   b <- c( .5, 1, 1.5, 2)
>  #  write it out
>   b
[1] 0.5 1.0 1.5 2.0
>  # solve equations
>   x <- solve(A,b)
>  #  write it out
>   x 
[1] -0.70  2.25  3.30 -0.90
>  rm(list=ls())                # clean up
>