R help - Mar 2007 - problem with throwing lines out of matrix

Dear all,

again i have a problem with special case of dropping lines out of a  
matrix.

i tried the following, where throwout is a vector of length 18 with  
simple id values that should be compared to any

for (k in 1:length(throwout))
{
mymatrix=matrix(mymatrix[-(forfact[k]),],ncol=4)	
	}


this didnt work and i tried the following to find the error:

mymatrix[,1][mymatrix[,1]==throwout[7]]
this returned me a nice value - everything fine...
but other same other values for throwout didnt work - because the  
throwout value simply is not in this matrix.
but i need the same throwout vector for different matrices - so i  
need to use it.

does anybody have an idea how i can throw out all lines in every of  
my 5 matrices that contain values of the throwout in their first  
column ?
and how to deal with the problem that not every matrix contains all  
throwout values in its first column...

maybe this might help:
in the end all matrices should have the same number of lines.



thx in advance, i´ll keep on trying ;)



	[[alternative HTML version deleted]]

You didn't' actually tell us what forfact is.  You could try something
like (untested)

My.matrix <- my.matrix[!(my.matrix[, 1] %in% remove.values), , drop = FALSE]

Also, reading some of the introductory R manuals you can find on CRAN in the
documentation section will really give you a leg up on some of these things.

Hope this helps.

Matt Wiener


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at
stat.math.ethz.ch] On Behalf Of bunny , lautloscrew.com
Sent: Thursday, March 01, 2007 2:09 PM
To: r-help at stat.math.ethz.ch
Subject: [R] problem with throwing lines out of matrix [Broadcast]

Dear all,

again i have a problem with special case of dropping lines out of a  
matrix.

i tried the following, where throwout is a vector of length 18 with  
simple id values that should be compared to any

for (k in 1:length(throwout))
{
mymatrix=matrix(mymatrix[-(forfact[k]),],ncol=4)	
	}


this didnt work and i tried the following to find the error:

mymatrix[,1][mymatrix[,1]==throwout[7]]
this returned me a nice value - everything fine...
but other same other values for throwout didnt work - because the  
throwout value simply is not in this matrix.
but i need the same throwout vector for different matrices - so i  
need to use it.

does anybody have an idea how i can throw out all lines in every of  
my 5 matrices that contain values of the throwout in their first  
column ?
and how to deal with the problem that not every matrix contains all  
throwout values in its first column...

maybe this might help:
in the end all matrices should have the same number of lines.



thx in advance, i?ll keep on trying ;)



	[[alternative HTML version deleted]]



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