On Jan 9, 2012, at 12:02 AM, jawbonemurphy wrote:
Hi Dave,
Thanks for your response!
I'm new at R, and I'm afraid I'm not sure what you mean by:
?lapply
?"["
?order
It means I thought you might get the answers you needed by looking at
those functions' help pages.
Were these suggestions for other commands to try? If so, can you be
more
specific? I apologize for being clueless :)
You should not apologize for being clueless but you should apologize
for not providing a sample dataset that would illustrate what you were
working with. This is probably because you did not read the Posting
Guide which you should take the time to do before responding. The
example doesn't need to be big but it should have all columns in the
format of the objects you are currently working with, and they should
be created with code or reproducible. Just printing out the dataframe
or head(dfrm) will NOT be as useful as if you posted the output of :
dput(head(dfrm,20))
# assuming that 20 rows is sufficient to have enough of any grouping
variables you need to form some groups. If not then you can increase
the size.
Secondly, you're right that the script I have now leaves me with the
means
from the last column. Do you have any suggestions for how to write
the
results for each "i" to a unique vector? I was going to try:
If you pre-allocated an objec that was large enought or if you used a
list, you could add items with "[" and hte index on the LHS of the
assignment.
mean_i <- tapply(x[,i], ID, etc..., but I was thinking that this
would just
create a vector named "mean_i" w/ results of last column, not a
separate
vector for each "i".
tapply does not create a vector. It creates a matrix or a list. And
that has the same problem ... you are overwriting with each pass
through the loop.
I guess what I want is some command to print the
result of each run before repeating with the next "i". Any ideas?
?print # but is that what you really wanted? Only console output?
Again,
thanks for the help.
Best,
Logan
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
