Hello,
It really looked like homework. As for your question, maybe this helps.
URL <- "http://r.789695.n4.nabble.com/file/n4685033/cylinder.dat";
cyl <- read.table(URL, header = TRUE)
plot(vol ~ ht, data = cyl)
The vectors you want are simply
cyl$vol
cyl[["vol"]]
cyl[[1]]
and the same for height.
To find the radius you can note that your formula is equivalent to
V=pi*r^2*H and use something like (note that the model has no intercept)
fit <- lm(vol ~ 0 + ht, data = cyl)
summary(fit)
r <- sqrt(coef(fit)/pi)
r
For linear models in R start by reading the file R-intro.pdf that comes
with any installation of R, folder 'doc' chapter 11 Statistical models in R.
Hope this helps,
Rui Barradas
Em 11-02-2014 06:06, nivek escreveu:
Thank you for your help. This is not homework however and my difficulty is in
the fact that i cannot figure out how the declare a variable for the height
or the volume given a data set where the matrix is already formed. I have
looked on many sites for the is answer and it seems like it would be an easy
one. So for this problem the provided data column 2 is the height data and
column 1 is the volume. What command do I use to read those values and form
a vector. Thank you for your time.
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