[R] histogram with density

[Peter Ehlers]

On 2011-05-23 21:31, Rekha wrote:
> S . Am getting error still now if i use both version of the codes .
>
> i have to call any library?

Your code works fine for me, too, as it should.
Have you perhaps redefined the hist() function?
Do you get a histogram?
The error you quote would result if you called lines() without
opening a graphics device.

Peter Ehlers

>
> 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
>>
>
>
>