R version 2.12.2 (2011-02-25)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_GB/en_GB/C/C/en_GB/en_GB

attached base packages:
[1] stats     graphics  grDevices utils     datasets  base     
[1] 2.0 0.5
[1] 2.2500000 0.8432818
Chkjac  possible error in jacobian(   1,   1)
        0.8000000000000D+01 Estimated =  0.4000000029802D+01
Chkjac  possible error in jacobian(   2,   2)
        0.1250000000000D+01 Estimated =  0.7500000298023D+00
$x
[1] 2.0 0.5

$fvec
[1] 2.2500000 0.8432818

$termcd
[1] -10

$message
[1] "Analytical Jacobian most likely incorrect"

$scalex
[1] 1 1

$nfcnt
[1] 0

$njcnt
[1] 0