Thank you Duncan. It works. It seems that NA is of great use.
Shiguo
On Thu, Feb 10, 2011 at 5:25 PM, Duncan Murdoch <murdoch.dun...@gmail.com>wrote:
> On 11-02-10 3:56 PM, Shiguo Jiang wrote:
>
>> Hello,
>>
>> I plot box plot, and add a point to the box indicating mean. I also add
>> some
>> range to the box width. I want to add legend for both the range (line) and
>> mean (point). However, I cannot add line legend and point legend together.
>> The code looks like the following.
>>
>
> Use NA for the lty in the ones with no lines or for the pch in the ones
> with no points.
>
> Duncan Murdoch
>
>
>> (1) First, I tried the following code, however, it plot a line across the
>> point legend("*").
>>
>> boxplot(count ~ spray, data = InsectSprays)
>>
>> rb<- boxplot(decrease ~ treatment, data = OrchardSprays, col="lightgrey")
>> title("Comparing boxplot()s and non-robust mean +/- SD")
>>
>> mn.t<- tapply(OrchardSprays$decrease, OrchardSprays$treatment, mean)
>> xi<- seq(rb$n)
>> points(xi, mn.t, col = "blue", pch = "*")
>>
>> h1<- abline(h=110, col="red")
>> h2<- abline(h=0, col="red", lty="dotted")
>>
>> legend("topleft", c("110", "0", "mean"),
>> lty = c("solid","dotted"), pch = c(" ", " ", "*"),
>> col = c("red","red", "blue"),lwd = c(1,1))
>>
>>
>>
>> (2) I then tried the following
>>
>> legend("topleft", c("110", "0", "mean"),
>> lty = c("solid","dotted"," "), pch = c(" ", " ", "*"),
>> col = c("red","red", "blue"),lwd = c(1,1))
>>
>>
>> It returns error as lty cannot be " ".
>>
>> Error in segments(x1, y1, x2, y2, ...) : invalid line type: must be length
>> 2, 4, 6 or 8
>>
>>
>> Can anyone help me out? Thank you.
>>
>> Shiguo
>>
>>
>
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