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...gesv: system is exactly singular" when I make a call to "nlminb". The negative log likelihood function being minimized is based on the multivariate normal distribution. Can anyone help me with the source of such an error message? Or better still how to get at the source? Thanks, SP: opomporay at yahoo.com ____________________________________________________________________________________ Got a little couch potato? Check out fun summer activities for kids.

Full_Name: Joseph Amuah Version: 2.7.0 (2008-04-22) OS: Windows Submission from: (NULL) (205.207.78.4) I used the plot function to create some graphs but wanted to add soem restrictions. A set of warning were produced even though the plot worked fine. Can these warnings be cleaned up? Here is an example: *************************************** > plot(xx$month, xx$log10RR, xlab="",