[R] histogram with density

[Steve Lianoglou]

On Tue, May 24, 2011 at 12:31 AM, Rekha <chithralekha86 at gmail.com> wrote:
> S . Am getting error still now if i use both version of the codes .
>
> i have to call any library?

No. The code you've written here doesn't require loading any other R libraries.

Please copy and paste the exact code you've entered along with the
*exact* error you are getting.

Also, what is the result of sessionInfo()?

-steve

>
> On Tue, May 24, 2011 at 9:22 AM, Steve Lianoglou
> <mailinglist.honeypot at gmail.com> wrote:
>>
>> Hi,
>>
>> On Mon, May 23, 2011 at 11:41 PM, Rekha <chithralekha86 at gmail.com> wrote:
>> > Hello All,*
>> >
>> > *I want to draw a histogram with density curve. *
>> >
>> > *For that simply i created a data called*"x" *and i used the function
>> > called
>> > *    hist(x, col = "blue", freq = FALSE),**   *from this function i got
>> > a
>> > histogram*.
>> >
>> > *After that , i tried this function*  ** lines(density(x), col = "red",
>> > lwd
>> > = 2  )  *but i could not get the density curve.
>> >
>> > So, Again i used  other function*    curve(dnorm, col = 2, add = TRUE)**
>> > *instead of the previous function for density curve.
>> >
>> > but still am getting error in R  like this:
>> >
>> >  Error in plot.xy(xy.coords(x, y), type = type, ...)
>> >  plot.new has not been called yet"
>> >
>> >
>> > *  I have used below codes to have a data and histogram with density
>> > curve"
>> >
>> > x <- rnorm(200)
>> > hist(x, col = "blue", freq = FALSE)
>> > lines(density(x), col = "red", lwd = 2)
>>
>> You should use the code above.
>>
>> I don't get it though -- this is working fine for me. Are you getting
>> the "plot.new" error for both versions of your code?
>>
>> Although I feel like in 99% of the time this won't be necessary, but
>> what happens if you call `plot.new()` before your call to hist?
>>
>> eg:
>>
>> R> x <- rnorm(200)
>> R> plot.new()
>> R> hist(x, col = "blue", freq = FALSE)
>> R> lines(density(x), col = "red", lwd = 2)
>>
>> Does that work? If not -- what if you use `dev.new()` in place of
>> `plot.new()`?
>>
>> -steve
>>
>> --
>> Steve Lianoglou
>> Graduate Student: Computational Systems Biology
>>  | Memorial Sloan-Kettering Cancer Center
>>  | Weill Medical College of Cornell University
>> Contact Info: http://cbio.mskcc.org/~lianos/contact
>
>
>
> --
> Best Regards,
> Reka.
>
>
>
>



-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact