As I read this, my answers to the other guys don't seem to be
delievered to the list, although I sent them nearly 4 hours
ago. I fear, I only sent them to the posters and not to the
list ... I try to correct this! Sorry!
Axel Benz schrieb:> Which name do you want?
> varA1
This one resp. the corresponding one in this way (varA2 etc.).
> or
> fb.12.unt[varA1]
> or even then value of varA1????
This question tells me, that you know more than me ;-). Who
wonders ...? There are 98 values for varA1. Did I use wrong
terms, that 98 values are surprisingly?
> Your question looks like you made a mistake in your code (just a
> suggestion, of course I can be wrong (that's on thing why I don't
like R
> too much: You can more or less write what you want, It's allway
correct,
> even if it makes no semantical sense at all)).
Hm, how can I enlighten this? There's a data.frame (fb.12.unt)
with 302 variables (columns) and 98 values for each (rows).
Sorry, if I use the wrong terms!! The data.frame was imported
from SPSS-Data. Some of these variables belong together
(altogether ~250) and for those I want summaries in extra files.
> What is: fb.12.unt[varA1:varZ9]
> You treat it like a vector, but it is already indexed by a vector, which
> is a sequence from the
> value of varA1 to the value of varZ9.
Ok, here I has to capitulate ;-/.
A vector is a datastructure, that concatenates several
objects of the same kind to one object, e.g. a variable?!?
A data frame allows the combination of different data types in
a matrix, right? Whereas a matrix has a rectangular structure
with vectors resp. variables in columns?!
With this understanding "fb.12.unt" is a data frame and
"varA1:varZ9" is a sequence of vectors resp. variables. These
vectors consist of 98 single values resulting in 98 rows of
the data frame.
So, "fb.12.unt[varA1]" is a vector, that I want to be
summarised. And I want "fb.12.unt[varA2]" etc. summarised, too.
Hoo, I hope I could clarify a little bit =).
> This is really complicated and hard to follow! That's why I believe
it's
> not what you want.
After some investigation, I have to say, that you may be right
(but don't give too much on this statement, because I'm quite
confused at the moment). What I want is a summary of each of
the variables/columns. I could also do
> attach(fb.12.unt)
> summary(varA1) # varA1 is a variable from fb.12.unt
for each variable (varA2 etc.) or
> detach(fb.12.unt)
> summary(fb.12.unt["varA1"])
for each variable.
> What ist fb.12.unt?
> If it is a data.frame:
> for (i in colnames(fb.12.unt)){print i;...}
I couldn't check this code, because I don't know how to
replace the ellipsis ("...").
> If it is a vector:
> for (i in 1:length(fb.12.unt)){print i;...}
> If it is a matrix, it could be:
> for (i in 1:ncol(fb.12.unt)){print i;...}
> (or nrow instead of ncol)
>
> By the way: The only reason NOT to use this relatively easy-to-read
> iterations is performance and with 250 loops this reason does not count.
Ok. I thought, it wasn't "elegant", too =).
[...]
Thanks for your answer, that was first confusing and then
therefore clarifying. I hope /my/ answer isn't too confusing.
Best regards,
Christoph
--
Christoph Bier, Dipl.Oecotroph., Email: bier at wiz.uni-kassel.de
Universitaet Kassel, FG Oekologische Lebensmittelqualitaet und
Ernaehrungskultur \\ Postfach 12 52 \\ 37202 Witzenhausen
Tel.: +49 (0) 55 42 / 98 -17 21, Fax: -17 13
