R help - Jun 2011 - Help creating a scatterplot with errorbars using gplot

I am having a problem creating a scatterplot with error bars using gplot.
This is only my second day using R so I am very much a newbie.

My x-values (OD600) are:

0.00400000 0.01866667 0.04733333 0.08733333 0.22466667 0.42400000 0.82066667
1.39233333 1.61100000

My y-values (cellconc) are:

2e+06 5e+06 1e+07 2e+07 5e+07 1e+08 2e+08 5e+08 1e+09

And my standard deviations (stdev) are:

0.001154701 0.003000000 0.002081666 0.009865766 0.015716234 0.040253364
0.017691806 0.013868429 0.007234178

I use the command:

plotCI(OD600, cellconc, uiw=stdev)

And I receive a graph that looks correct but without any error bars.  I also
receive these warnings:

1: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
2: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
3: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
4: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
5: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
6: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
7: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
8: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
9: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
10: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
11: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
12: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
13: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
14: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
15: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
16: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
17: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped
18: In arrows(...) : zero-length arrow is of indeterminate angle and so skipped


Thank you for your help.

	[[alternative HTML version deleted]]