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2006 Jan 10
1
eigen()
Hi
I am having difficulty with eigen() on R-devel_2006-01-05.tar.gz
Specifically, in R-2.2.0 I get expected behaviour:
> eigen(matrix(1:100,10,10),FALSE,TRUE)$values
[1] 5.208398e+02+0.000000e+00i -1.583980e+01+0.000000e+00i
[3] -4.805412e-15+0.000000e+00i 1.347691e-15+4.487511e-15i
[5] 1.347691e-15-4.487511e-15i -4.269863e-16+0.000000e+00i
[7] 1.364748e-16+0.000000e+00i -1.269735e-16+0.000000e+00i
[9] -1.878758e-18+5.031259e-17i -1.878758e-18-5.031259e-17i
>
The same command gives different results in the development version:
> eigen(matrix(1:100,10,10),FALSE,TR...
2005 Nov 05
3
solve the quadratic equation ax^2+bx+c=0
If I have matrics as follows:
> a <- c(1,1,0,0)
> b <- c(4,4,0,0)
> c <- c(3,5,5,6)
How can I use R code to solve the equation ax^2+bx+c=0.
thanks!
yuying shi
[[alternative HTML version deleted]]
1997 Jul 24
0
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