[R--gR] smooth="periodic.lowess"???

[XP Sun]

hi, everyone,

this is the first time for me to use R,
would you like to tell me how to use this command? thank you in advance.

fit <- principal.curve(y, plot = TRUE, smooth="periodic.lowess", iter=0)

when i uesd the parameter 

   smooth="periodic.lowess", 

i met a error. the message is:

   Error in cbind(...) : number of rows of matrices must match (see arg 2)

any help is appreciated.

best, 

　　　　　　　　Sun
　　　　　　　　xpsun at ict.ac.cn
　　　　　　　　　　2004-10-21