[R] Plot fixed effect with covariates failed

[Yang, Richard]

Dear R-help;

	I created a nlme model (Xnlme) with 3 fixed effects B1, B2, and B3.
The random effects and available covariates in the groupedData were
extracted with raned():

>Xnlme.ranef <- ranef(Xnlme, aug = T)

When the fixed effect was plotted against covarites, an error occurred:

>plot(Xnlme.ranef, form = B1 ~ ps + dr + el + sl + as)

an error occurred:

"Error in max(length(x0), length(x1), length(y0), length(y1)) : 
        Argument "x0" is missing, with no default "

Some of the covariates are factors (ps, dr, as) and some continuous. What
did I miss? Any workaround?

Regards,

Richard




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