[R] How to add a new plot in the same graph using add=T at the command plot?

[Uwe Ligges]

On 10.06.2010 10:19, Petr PIKAL wrote:
> Hi
>
> Peter Ehlers<ehlers at ucalgary.ca>  napsal dne 09.06.2010 19:05:24:
>
>> Soapbox:
>> Well, if you're just starting out with R it would be
>> a VERY good idea to learn right away that T is not TRUE
>> and F is not FALSE, at least not always. Sooner or
>> later you WILL have problems. So do yourself a favour
>> and get into the habit of using TRUE/FALSE instead of T/F.
>>
>> (I know that Petr knows better.)
>
> Yes good point. However when I work interactively with command prompt I
> often (well almost exclusively :-) use T/F instead of TRUE/FALSE as I am
> lazy to type. It is necessary to keep habit not to use
> T/F/c/matrix/vector/... as names for objects. So T can be used as
> abbreviation for TRUE like
>
> mean(x, na.rm=T)
>
> as long as you do not define
>
> T<- "Title"
> mean(x, na.rm=T)
> Error in if (na.rm) x<- x[!is.na(x)] :
>    argument is not interpretable as logical


But note that

T <- 0
mean(x, na.rm=T)

will yield a more surprising result and that's the reason why you really 
should not even start to use F and T (neither for a logical value nor 
for a number).

Uwe Ligges





> at least until T/F is removed from such use by R developers
>
> You can even try
>
> ?"T"
>
> and you can read help page for that.
>
> Regards
> Petr
>
>
>>
>>    -Peter Ehlers
>>
>> On 2010-06-09 9:08, Larissa Lucena wrote:
>>> Thanks so much!!! I'm using R for the first time, and so, I have many
> stupid
>>> doubts! Sorry and thanks again!
>>>
>>>    Regards!
>>>
>>> 2010/6/9 Petr PIKAL<petr.pikal at precheza.cz>
>>>
>>>> Hi
>>>>
>>>> where did you find parameter add=T.
>>>>
>>>> You can use
>>>>
>>>> par(new=T)
>>>> before using new plot command
>>>>
>>>> or use
>>>>
>>>> points, lines
>>>>
>>>> Regards
>>>> Petr
>>>>
>
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