[R] nlme varFixed

[Franz Härtl]

Dear R-project team,

I have a problem with the function varFixed() of the nlme-package.

I used it with the squid-data of Zuur et. al 2009 (chapter 4), to fix 
increasing residuals (heterogenetiy) (see graph in the email)

I get the message '

Variance function structure of class varFixed with no parameters, or 
uninitialized

Could you help me please?

Kind regards

Franz