[Rd] "error using packet 1"

From: origano <g.tarquinio_at_dmbi.org>
Date: Thu, 28 Aug 2008 03:31:01 -0700 (PDT)

Hello,
I'm Giovanni from ROMA..

I can't find a solution for the error:

"error using packet 1
the y field is not specified and it has not a default value" (this is my traslation from italian language)

The code is:

pc<- qqmath(~valori,

        distribution=function(p) qweibull(p,beta,alpha),
        prepanel = prepanel.qqmathline,
        panel = function(x, y) {
             panel.grid()
             panel.qqmathline(y, distribution = function(p)
qweibull(p,beta,alpha))
             panel.qqmath(x, y)
           },
        layout = c( 1,1), aspect = 0.8,
        xlab = "Unit Weibull Quantile", ylab = "D"
    )

Thanks for your regard,
Giovanni

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