[R] scatterplot x axis specifications

[jhartsho]

  Bolt       Day Cookie    MC
1  MCA01   0 Bottom 60.28
2  MCB01   0 Bottom 83.63
3  MCC01   0 Bottom 48.34
4  MCB02   0 Bottom 84.52
5  MCA05   0 Bottom 74.92
6  MCA01   0    Top 65.35
7  MCB01   0    Top 88.68
8  MCC01   0    Top 29.19
9  MCB02   0    Top 82.63
10 MCA05   0    Top 77.61
 MC151  15 Bottom 63.92
12 MC152  15 Bottom 68.24
13 MC153  15 Bottom 63.42
14 MC154  15 Bottom 43.15
15 MC155  15 Bottom 52.04
16 MC151  15    Top 53.39
17 MC152  15    Top 55.45
18 MC153  15    Top 56.24
19 MC154  15    Top 53.52
20 MC155  15    Top 42.83

This is a small subset of my data.  

plot(pair$MC~pair$Day, pch=c(19,24)[as.factor(Cookie)],
	xaxt="n",
	main='Paired t Test',
	xlab='Days in Field',
	ylab='Moisture Content (Percent)')

Gives me the plot I need minus the x axis.  Adding 
axis(1, at=0,15,30,45) or using a sequence of axis(1, at=seq(0,45,15))
gives me either x and y are different lengths or plot.new has not been
called yet.

Everything else is perfect.

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