I just tried to plot sqrt(sqrt(x)) and it appears to start at the point (0,0.55)
My end goal was to plot an x^0.25 power curve scaled so that it ran through (0,47) and (100,77) but when I did this the curve appeared to start a (0,57) instead. So I'm fairly sure this isn't an artifact of gnuplot starting the plot near (but not exactly at) x=0.
Any thoughts? I'm running gnuplot 4.44 win 32 on a windows 7 machine
set samples <some-large-number>