Displaying 3 results from an estimated 3 matches for "_separately_".
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2012 Mar 08
1
binning dates by decade for simulated data
I have a simulated matrix of dates that I generated from a probability
function. Each column represents a single iteration.
I would like to bin each run _separately_ by decades and dump them into a
new matrix where each column is the length of all decades a single run with
the number dates binned by decade.
I have successfully done this for a single vector of dates, but not for a
matrix:
"dates" is a vector of observed data representing when certai...
2007 Apr 09
3
do.call vs. lapply for lists
Hi All,
I'm trying to understand the difference between do.call and lapply for
applying a function to a list. Below is one of the variations of
programs (by Marc Schwartz) discussed here recently to select the first
and last n observations per group.
I've looked in several books, the R FAQ and searched the archives, but I
can't find enough to figure out why lapply doesn't do what
2012 Oct 10
3
practical to loop over 2million rows?
New to R and having issues with loops. I am aware that I should use
vectorization whenever possible and use the apply functions, however,
sometimes a loop seems necessary.
I have a data set of 2 million rows and have tried run a couple of loops of
varying complexity to test efficiency. If I do a very simple loop such as
add every item in a column I get an answer quickly.
If I use a nested ifelse