R help - Jul 2011 - ?plot: Add an example on how to plot functions to the help of `plot`.

Dear R folks,


currently the section Examples contains the following as an example on
how to plot a ?normal? function.

	plot(sin, -pi, 2*pi)

Since it does not contain the argument for the function it would be
helpful to add for example the following.

        ## plots the graph of f(x) = x**2 with f(x) ? [1, 10]
        
        curve(x**2, 1, 10)
        
        ## plots the graph of f(x) = x**3 with f(x) ? [1, 10] and adds it to an
already existing plot
        
        curve(x**3, 1, 10, add=T)
        
        ## plots the graph of f(x) = x**4 connected by lines and adds it to an
already existing plot
        
        lines(x, x**4, add=T)

`curve` and `lines` could be also added to the section See Also.


Thanks,

Paul
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Paul:
No such change is needed. You do not understand S3 methods. See
?plot.default and read about S3 methods (e.g. in the tutorial
Introduction to R or the Language manual).

-- Bert

On Wed, Jul 27, 2011 at 12:30 PM, Paul Menzel
<paulepanter at users.sourceforge.net> wrote:
> Dear R folks,
>
>
> currently the section Examples contains the following as an example on
> how to plot a ?normal? function.
>
> ? ? ? ?plot(sin, -pi, 2*pi)
>
> Since it does not contain the argument for the function it would be
> helpful to add for example the following.
>
> ? ? ? ?## plots the graph of f(x) = x**2 with f(x) ? [1, 10]
>
> ? ? ? ?curve(x**2, 1, 10)
>
> ? ? ? ?## plots the graph of f(x) = x**3 with f(x) ? [1, 10] and adds it to
an already existing plot
>
> ? ? ? ?curve(x**3, 1, 10, add=T)
>
> ? ? ? ?## plots the graph of f(x) = x**4 connected by lines and adds it to
an already existing plot
>
> ? ? ? ?lines(x, x**4, add=T)
>
> `curve` and `lines` could be also added to the section See Also.
>
>
> Thanks,
>
> Paul
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>


-- 
"Men by nature long to get on to the ultimate truths, and will often
be impatient with elementary studies or fight shy of them. If it were
possible to reach the ultimate truths without the elementary studies
usually prefixed to them, these would not be preparatory studies but
superfluous diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics

Dear Bert,


Am Mittwoch, den 27.07.2011, 13:26 -0700 schrieb Bert
Gunter:
> Paul:
> No such change is needed.
Well the fact is, that I as a beginner was looking for who I could plot
normal functions, so one more example would have helped me.
> You do not understand S3 methods.
That is probably true.
> See ?plot.default and read about S3 methods (e.g. in the tutorial
> Introduction to R or the Language manual).
Searching for ?s3 m? in [1] did not give me a good explanation. I have
not yet read the language manual.

By trial and error I still suggest to add the following.

        # Plot the graph of a function f(x) = x^3 with the points connected by
lines.
        # If you want to plot the graph as a curve please look into `curve()`.
        y <- seq(1:5)
        plot(y, y**3, type="l")

This would have helped me as a beginner.


Thanks,

Paul


[1] http://cran.r-project.org/doc/manuals/R-intro.html
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On Jul 27, 2011, at 4:53 PM, Paul Menzel wrote:
> Dear Bert,
>
>
> Am Mittwoch, den 27.07.2011, 13:26 -0700 schrieb Bert Gunter:
>> Paul:
>> No such change is needed.
>
> Well the fact is, that I as a beginner was looking for who I could  
> plot
> normal functions, so one more example would have helped me.
>
>> You do not understand S3 methods.
>
> That is probably true.
>
>> See ?plot.default and read about S3 methods (e.g. in the tutorial
>> Introduction to R or the Language manual).
>
> Searching for ?s3 m? in [1] did not give me a good explanation. I have
> not yet read the language manual.
>
> By trial and error I still suggest to add the following.
>
>        # Plot the graph of a function f(x) = x^3 with the points  
> connected by lines.
>        # If you want to plot the graph as a curve please look into  
> `curve()`.
>        y <- seq(1:5)
>        plot(y, y**3, type="l")
>
> This would have helped me as a beginner.
I think that what Bert might have been trying to get you to do was to  
type:

?plot.function  # which is what you might once you do get a better  
understanding S3 methods.



-- 

David Winsemius, MD
West Hartford, CT