[R] plot a new picture against an old one to see the difference between them

[Am Stat]

Dear Roger,

Thanks, that's really helpful,  do you know how to deal with it if the two 
plots are  generated by plot(), not by contour().

Best,

Leon


----- Original Message ----- 
From: "roger koenker" <roger at ysidro.econ.uiuc.edu>
To: "Am Stat" <amstat2006 at gmail.com>
Sent: Monday, September 04, 2006 8:06 PM
Subject: Re: [R] plot a new picture against an old one to see the difference 
between them


> for the second call to contour  use the argument add=TRUE.
>
> On Sep 4, 2006, at 6:42 PM, Am Stat wrote:
>
>> Hello, useR:,
>>
>> Suppose I have two plots made by using contour() function, say  Cont1 and 
>> Cont2 respectively.
>>
>> They have slightly difference because of the two slightly different  data 
>> I used.
>>
>> I want to see the difference between them so I want to plot Cont2  on 
>> Cont1, are there any methods to plot it without filling the  frame of 
>> Cont1 totally of Cont2.
>> I mean, how I can integreate the two plots together that they kind  of 
>> have weighted colors?
>>
>> Thanks very much in Advance!
>>
>> Leon
>> [[alternative HTML version deleted]]
>>
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>