[R] convert zoo object to "standard" R object so I can plot and output to csv file

[Henry]

Another simple question - trying to specify xlim in a zoo plot and getting
error
my plot line is
plot(z1,
ylim=c(-100,3000),xlim=c(chron("10/30/2011","00:00:00"),chron("10/30/2011","00:20:00")),type="b",xlab="",ylab="1
Minute Fit",cex.lab=1.3)
Error in substring(paste("0", v$day, sep = ""), first = nchar(paste(v$day)))
: 
  invalid substring argument(s)

Most of the complete code pasted below.....
fmt<-"%m/%d/%Y %H:%M:%S"  # describe the date/time format in the file
tail1<-function(x) tail(x,1)
z<-read.zoo("Cooling-1.txt",FUN=as.chron,format=fmt,sep="\t",header=TRUE,aggregate=tail1)

par(oma=c(6,1,4,2)) # set the outside space boundaries

par(mfrow=c(2,1)) # set the number of graphs (rows,cols) going on one page

# plot the original data
par(mar=c(1.1, 5, .9, 0.5))
plot(z, ylim=c(-100,3000),type="b",xlab="",ylab="Raw
Data",col="red",cex.lab=1.3)
grid(nx=NA,ny=NULL,lwd=.5,lty=1,col="red")

# calculate and plot the 1 minute straight line interpolation 
m1 <- times("00:01:00")
g <- seq(trunc(start(z),m1),end(z),by = m1)
z1<-na.approx(z,xout = g)

#plot the 1 minute linear interpolation fit
par(mar=c(1.1, 5, .9, 0.5))
#the following plot line generates the error
plot(z1,
ylim=c(-100,3000),xlim=c(chron("10/30/2011","00:00:00"),chron("10/30/2011","00:20:00")),type="b",xlab="",ylab="1
Minute Fit",cex.lab=1.3)
grid(nx=NA,ny=NULL,lwd=.5,lty=1,col="darkgrey")



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