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measurements
2006 Mar 11
2
how to create analog stripchart plots of x vs t (t=mm/dd/yyyy hh:mm:ss)
Hello r-experts,
I sure could us a little help.
I have an ever updating text file with timestamped data in it. I can
reformat in anyway I want if need be but currently I have chosen to make
columns of date, time and measuresed value (comma delimeted and with the
dates and times in quotes to interpret them as strings).
Here is a small section of my text data file:
2005 Apr 24
1
large dataset import, aggregation and reshape
...columns (in fact many more, but we need only 4 of them): id, factor 'a'
(5 levels), factor 'b' (15 levels), date-stamp, numeric measurement. We
run R on suse-linux 9.1 with 2GB RAM, (and a 3.5GB swap file).
on average we have 30 obs. per id. We want to aggregate (eg. sum of the
measuresments under each factor-level of 'a' and the same for factor
'b') and reshape the data so that for each id we have only one row in
the final data.frame, means finally we have roughly 400000 lines.
I tried read.delim, used the nrows argument, defined colClasses (with an
as.Date class)...