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

[Arnau Mir Torres]

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.