On Aug 9, 2011, at 2:10 AM, Richard Ma wrote:
Hi David,
Thank you very much. Problem solved.
sapply() and lapply() are so powerful that even I have read their
documents
several times, still lots of tricky stuff to learn and try.
The basic difference between my approach and yours was that after
noticing that you needed to iterate over the indices of two different
structures, I used them as the arguments. This would also have worked
and be generalizable in situations where the two lists shared column
names or named indices:
sapply( names(rst), function(x) locpoly(x=ts, y=rst[[x]],
bandwidth=bw[[x]], gridsize=gs) )
I also considered code that used mapply and the general form might
have been:
mapply(locpoly, y=rst, bandwidth=bw, MoreArgs=list(x=ts, gridsize=gs) )
Seems also to succeed, and is more along the logic htat you were
attempting.
--
David.
Thank you again!
Richard
David Winsemius wrote:
sapply(c("hsp", "dal"), function(x) locpoly(x=ts, y=rst[[x]],
bandwidth=bw[[x]], gridsize=gs) )
hsp dal
x Numeric,350 Numeric,350
y Numeric,350 Numeric,350
--
David.
In above example, I can apply the "locpoly()" to each column of
“rst”. But
if I want to apply this function to all columns of "rst", I guess I
should
use lapply() function.
However, the "bandwidth", one of the locpoly()'s arguments should be
different due to different columns of "rst". It means that when R
apply
locpoly() to first column "hsp", the "bandwidth" should be set as
correspondent bandwidth.
My problem is, how to pass the "bandwidth" argument to "locpoly"
within
lapply() in terms of different column names?
My example just tedious if the "rst" has lots of columns. So I
wonder if
there exist more convenient way to get this job done.
Thank you.
-----
Richard Ma
PhD student, Ecology & Remote Sensing
Climate Change Cluster, Department of Environment Science
University of Technology, Sydney
--
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______________________________________________
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PLEASE do read the posting guide
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
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and provide commented, minimal, self-contained, reproducible code.
-----
Richard Ma
PhD student, Ecology & Remote Sensing
Climate Change Cluster, Department of Environment Science
University of Technology, Sydney
--
View this message in context:
http://r.789695.n4.nabble.com/How-to-pass-different-arguments-to-a-function-within-lapply-tp3728858p3729070.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
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
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
