[R] sub in boxplot doesn't do subtiles

[Robert L. Sandefur]

R list-

Under Windows 2000 and r 99:

I wanted a subtitle in boxplot and tried:

> boxplot((AU[ROCK==2 & AU>-1]+0.1~iz),log="y",main="Boxplot of AU by 25 M elevations",sub="aa")

And I got:

Error in sort(x) : only vectors can be sorted
In addition: Warning messages: 
1: is.na() applied to non-(list or vector) in: is.na(x) 
2: is.na() applied to non-(list or vector) in: is.na(x) 
3: is.na() applied to non-(list or vector) in: is.na(x) 
4: is.na() applied to non-(list or vector) in: is.na(x) 
> boxplot((AU[ROCK==2 & AU>-1]+0.1~iz),log="y",main="Boxplot of AU by 25 M elevations")
> title(sub="aa")

Gives a subtitle. 

Could someone point me to the documentation of sub in Boxplot (I did actually try help(boxplot))

Thanx

bob sandefur

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