Joseph P Gray wrote:
I submit the following matrix to both MATLAB and R
x= 0.133 0.254 -0.214 0.116
0.254 0.623 -0.674 0.139
-0.214 -0.674 0.910 0.011
0.116 0.139 0.011 0.180
MATLAB's inv(x) provides the following
137.21 -50.68 -4.70 -46.42
-120.71 27.28 -8.94 62.19
-58.15 6.93 -7.89 36.94
8.35 11.17 10.42 -14.82
R's solve(x) provides:
261.94 116.22 150.92 -267.78
116.22 344.30 286.68 -358.30
150.92 286.68 252.96 -334.09
-267.78 =358.30 -334.09 475.22
inv(x)*x = I(4)
and solve(x)%*%x = I(4)
Is there a way to obtain the MATLAB result in R?
Multiply x[3,4] by 10:
> xx <- x
> xx[3,4]<-0.11
> solve(xx)
[,1] [,2] [,3] [,4]
[1,] 137.20892 -50.67500 -4.705127 -46.41581
[2,] -120.71445 27.27570 -8.937571 62.19270
[3,] -58.15073 6.93474 -7.886343 36.93919
[4,] 8.34851 11.17053 10.415928 -14.81602
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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