[R] how to make a contour plot in R?

[Uwe Ligges]

Arnau Mir Torres wrote:

> Uwe Ligges wrote:
> 
>> Arnau Mir Torres wrote:
>>
>>  
>>
>>> Hello.
>>>
>>> I am an nxn data frame in the variable frame.
>>> I want to make a contour plot with it. That is, I want to plot a 
>>> square of dimensions [1,n]x[1,n] with the  gray level of square 
>>> [i,i+1]x[j,j+1] equal to frame[i,j].
>>>
>>> How can I make it?
>>>   
>>
>>
>>
>> See ?image
>>
>> Uwe Ligges
>>
>>
>>  
>>
>>> Thanks,
>>>
>>> Arnau.
>>>
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>>> PLEASE do read the posting guide! 
>>> http://www.R-project.org/posting-guide.html
>>>   
>>
>>
>> ______________________________________________
>> R-help at stat.math.ethz.ch mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide! 
>> http://www.R-project.org/posting-guide.html
>>
>>  
>>
> The problem is image works with matrices but I am a data frame. So, the 
> question is: how can I transform a data frame in a matrix?
> 
> 
> Arnau.

?as.matrix

Uwe Ligges