[S] plotting a regression object

Matthew Wiener (mcw@ln.nimh.nih.gov)
Tue, 28 Apr 1998 14:15:40 -0400 (EDT)

Hello, all.

I know this is a basic question, but I've been through the documentation
and can't find the answer.

In the following code:

function(cell, n = 1) {
cell <- cell[cell$lat < 999, ]
a <- tapply(cell$lat, cell$stim, mean)
b <- tapply(cell$lat, cell$stim, var) #
mean.sp <- tapply(cell$sp, cell$stim, mean)
g <- 1 - 1/b
dframe <- as.data.frame(cbind(a, b, mean.sp, g))
if(n == 1) {
(not important for this question)
if(n == 2) {
par(mfrow = c(2, 3))
reg1 <- lm(log(dframe$b) ~ log(dframe$a))
plot(lm(log(dframe$b) ~ log(dframe$a)))
par(mfrow = c(1, 1)) #

with n=2, I get an error in the plot statement:

Error: Object "dframe" not found.

I get the same error if I say plot(reg1).

The examples in the documentation all seem to look exactly like this.

Thanks for your help. If people reply privately, I'll post a summary; if
they post to the group, I won't.


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