[R] Error in -c(intcol, respcol) : invalid argument to unary operator

[scriptham]

Hi

I am using R 2.9.1 packages as per install.packages(FrF2) recently
downloaded and installed.

I am using a made up data set where blank is just a blank column.
The data is in an excel sheet saved as a csv file.

=================  START OF SHEET ===========================
response	f1	f2	f3	blank response2	fone	ftwo	fthree
4	-1	-1	-1		4.0	lo	lo	lo
1	-1	-1	1		1.0	lo	lo	hi
3	-1	1	-1		3.0	lo	hi	lo
4	-1	1	1		4.0	lo	hi	hi
10	1	-1	-1		10.0	hi	lo	lo
12	1	-1	1		12.0	hi	lo	hi
18	1	1	-1		18.0	hi	hi	lo
30	1	1	1		30.0	hi	hi	hi
=================  END OF SHEET ===========================


My entire R code is:


#=============   START OF CODE   =====================#
#Instructions
#*** Define the data by file part 6 *****
datafile = "F:/dat1916/Ranalysis/FrF2test.csv"
#*** Open and read the file *****  
mydata = read.csv(datafile, header=TRUE, sep=",") 
names(mydata)
str(mydata)
#*** Plot cube plot for interactions
attach(mydata)
cubePlot(response, f1, f2, f3, main=paste("Cube plot for ,response"),
cex.title=1.5,cex.lab=par("cex.lab"), cex.ax=par("cex.axis"),
cex.clab=1.2, size=0.3, round=NULL,
abbrev=4,y.margin.add=-0.2, modeled=TRUE)
#*** Main Effect Plot
#mydf <- data.frame(..., row.names = NULL, check.rows = TRUE, check.names =
TRUE)
mydf1 <- data.frame(mydata[1:4])
mydf2 <- data.frame(mydata[6:9])

#attach(mydata2)
mylm1 <- mydf1$response ~  mydf$f1   + mydf$f2   + mydf$f3
mylm2 <- mydf2$response2 ~ mydf$fone + mydf$ftwo + mydf$fthree

MEPlot(mylm1)
MEPlot(mylm2)

IAPlot(mylm1, main = paste("Interaction plot matrix for", respnam), 
    pch = c(15, 17), cex.lab = par("cex.lab"), cex = par("cex"), 
    cex.xax = par("cex.axis"), cex.yax = cex.xax, cex.title = 1.5, 
    lwd = par("lwd"), abbrev = 4, show.alias = FALSE)
#=============   END OF CODE   ========================#

The cube plot seems to work OK.
MEPlot and IAPlot produce the following error:
Error in -c(intcol, respcol) : invalid argument to unary operator.
It seems as though the negative 1 values are problematic but the FrF2
instructions insist on neg1 and plus1 values.

Does anyone know what I should do to overcome this please.

Many thanks 
scriptham


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