[Gnuplot-info] Function plot

[<ma...@my...>]

I have the following code:

f(x) = -1 + (2/x)*(((1-((2/3)*x**2))*exp(-x)) + \
      ((1+x)*exp(-2*x))) /\
      (1 + ((1+x+((1/3)*x**2))*exp(-x)))

set samples 500
set xrange [0.1:6]
set yrange [-1.2:0]
plot f(x)

The plot is not as expected (see attachment g1.png). But,if I use the same
expression, compute the values externally and then plot those values, the
graph is as expected (attachment g2.png).

Any pointers would be helpful.

Regards,

mas