Dear friends,
  My dataset is like the following:
         x                y              mcpvalue
0.4603578     0.6247629       1.001
0.4603715     0.6247788        1.001
0.4603852     0.6247948       1.001
0.4110561     0.5664841       0.995
 The x and y variables are unsorted.
 I use the function image(x,y,mcpvalue) to generate a plot, but the error
is that "increasing 'x' and 'y' values are expected". So i use
   image(x=seq(min(x),max(x)), y=seq(min(y),max(y)),z=as.matrix
(result$mcpvalue))
to do it again, but there is still an error "dimensions of z are not
length(x)(-1) times length(y)(-1)".
  Anybody can show me how to use the image() correctly with the original x/y
unsorted?
  Thanks very much.


-- 
With Kind Regards,

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Zhi Jie,Zhang ,PHD
Tel:+86-21-54237149
Dept. of Epidemiology,School of Public Health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
Email:epistat@gmail.com
Website: www.statABC.com
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