# [R] Making legend() look like my plot()

Dan Bolser dmb at mrc-dunn.cam.ac.uk
Thu Nov 25 23:35:22 CET 2004

```On Thu, 25 Nov 2004, Uwe Ligges wrote:

>Dan Bolser wrote:
>> Is this an impossible task?
>>
>> How about just problem 2 below, having one pch in one legend entry, but no
>> pch in the second?
>
>Please be at least a little bit patient! This is not a hotline! People
>are not working 24 hours a day just to answer your questions at once -
>they are answering questions on a voluntary basis!
>
>answer 1) is not straightforward, but you might want to use one of
>fillable symbols mentioned in ?points, e.g. number 21
>
>answer 2) pch = c(1, NA) should do the trick.
>
>legend(....., pch=c(21,NA), lwd=c(1,3), lty=c(1,3), pt.bg="white", col=1:2)

Ahhh... I tried pch=c(1,NULL), pt.bg='white' I couldn't work out what was
going on..

thanks very much for the info

>
>Uwe Ligges
>
>
>>
>>
>>
>> On Thu, 25 Nov 2004, Dan Bolser wrote:
>>
>>
>>>Hello,
>>>
>>>I am using code like the following to create as simple plot...
>>>
>>>
>>>
>>>plot(x,y,type='b')
>>>lines(lowess(x,y),lwd=3,lty=3,col=2)
>>>
>>>I want to add a legend which shows lines looking exactly like those used
>>>in my plot, i.e. a thin black line with gaps taken up by circles (the
>>>default for type='b', and a thick dashed red line with no pch at all).
>>>
>>>I have two problems,
>>>
>>>1) making the pch on the first like look like type = 'b' (gaps around pch)
>>>2) surpressing a pch on for the second line
>>>
>>>
>>>Any help with these two problems would be greatly appreciated.
>>>
>>>Any archive of plots and code to browse which could help me visually find
>>>what I want and then copy the code?
>>>
>>>
>>>An online user contributable database of 'graphics in R' would be
>>>smashing.
>>>
>>>
>>>How come some smart people dont just let me do something like
>>>
>>>legend(xpos,ypos,legend=add)
>>>
>>>to add a legend to the current plot for all the relevant points and lines
>>>which have been added so far?
>>>
>>>______________________________________________
>>>R-help at stat.math.ethz.ch mailing list
>>>https://stat.ethz.ch/mailman/listinfo/r-help
>>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>>>
>>
>>
>> ______________________________________________
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>

```

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