[R-SIG-Finance] Error when Using fPortfolio to plot the fitting

[曹鼎贤]

Dear All, 
    I was learning using the package fPortfolio by the ebook Portfolio Optimization. When I was using the function to print the fitting result which is completely the same as that in the book, there was an error report as follows:   

	>library(fPortfolio)
	> fit <- assetsFit(LPP2005.RET[, 1:3], method = "st")
	Warning Messages£º
	In whichFormat(charvec[1]) :
  	  character string is not in a standard unambiguous format
	> plot(fit,1)
	Error at as.double(x) :
	  cannot coerce type 'S4' to vector of type ¡®double¡¯ 
	 
  The correct result should be a group of picture to show the effect of fitting. Could anyone give me some instructions? THANK YOU.

Best Regards, 
Cao Dingxian
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