[R] Odp: question on image() function?
Petr PIKAL
petr.pikal at precheza.cz
Thu Nov 8 18:31:18 CET 2007
Hi
look at akima package, especially its function interp.
Petr
petr.pikal at precheza.cz
r-help-bounces at r-project.org napsal dne 08.11.2007 17:51:21:
> 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 at gmail.com
> Website: www.statABC.com
>
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