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Benchmarking package, dea.plot.transform

John P. Burkett 
The Benchmarking package is generally working well for me but one of its 
functions, dea.plot.transform, produces results that look odd to me.

Under Ubuntu 10.04 LTS, I am running R version 2.13.2 and Benchmarking 
version 0.20 ($Revision: 118 $). In that environment, I tried executing 
the following code:
y1 = c(0, 2, 6, 8)
y2 = c(7, 4, 5, 0)
library(Benchmarking)
dea.plot.transform(y1, y2)

My expectation was that the code would produce a continuous, 
piecewise-linear transformation curve (production possibility frontier) 
passing through the points (0, 7), (6, 5), and (8, 0).  Instead, it 
produced a horizontal line segment from (0, 7) to  (6, 7) and a separate 
line segment from (6, 5) to (8, 0).  The discontinuity appears to me to 
be a mistake.

If anyone could help me understand why my code is not producing the 
expected transformation curve and how to correct the problem, I would be 
most grateful.

Best regards,
John