Displaying 4 results from an estimated 4 matches for "oldmat".
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oldmac
2005 Apr 15
4
function corresponding to map of perl
Is there a function in R that corresponds to the
function ``map'' of perl?
It could be called like:
vector.a <- map( vector.b, FUN, args.for.FUN )
It should execute for each element ele.b of vector.b:
FUN( vector.b, args.for.FUN)
It should return a vector (or data.frame) of the results
of the calls of FUN.
It nearly works using:
apply( data.frame( vector.b ), 1, FUN,
2010 Oct 12
2
extract rows of a matrix
Hi all,
I want to extract every 20th row of a big matrix, say 10000 by 1000.
What is the simper way to do this?
Thank you very much!
Hannah
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2010 Jun 10
2
adding column of ordered numbers to matrix
Hello everyone,
I have a matrix of over 40000 line and about 30 columns.
For my analysis I would like to add another column with ascending numbers
(column header should be "order", and than 1,2,3,4 ....the end of the
matrix).
During my analysis I reorder them ( due to merge commands by a different
column).
How do I add such a column in an ascending order (or descending for what it
2010 Oct 15
0
nomianl response model
...ail.org>
To: li li <hannah.hlx at gmail.com>, r-help <r-help at r-project.org>
Subject: Re: [R] extract rows of a matrix
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> newmat <- oldmat[ c(rep(FALSE,19),TRUE), ]
Or
> newmat <- oldmat[ seq(20, nrow(oldmat), 20), ]
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111
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