need some advice on x y plot

[nephish at xit.net]

Hey there,
i have tried about every graphing package for python i can get to work
on my system. gnuplot, pychart, biggles, gdchart, etc.. (cant get
matplot to work)
so far, they all are working ok. I need to make an x y chart for some
data that comes in from sensors at different times durring the day. i
need it to show the value in the y and the time in the x .  no problem
so far. But what i cannot get to happen is to scale x (time of the
plot) with respect to time. in other words, i get a chart with the
times evenly spaced out along the x axis, with their respective values.
i need the chart to show gaps when there are gaps in the data. i need
it to be able to scale by time. if i have 3 values that come in within
a few minutes, i need them to be displayed close together, as compared
to another value that may come in, say, an hour later. Does this make
sence ?
one of you guys know a charting app that will do this ? or is there
some other way i could do it?

looking for suggestions,
sk