On Jul 1, 2011, at 12:14 PM, Trying To learn again wrote:
Hi all,
I want to create a new matrix based on a previous matrix.
You see, If my "data" matrix accomplises this:
if(rowSums(data[i,])>16|rowSums(data[i,])<28)
data[i,]= data[i,]
'if' is not the right command.
# if sum of rows is more than 16 and less 28 I conservate the row
#but How I say if else "remove" the line (I tried this) but doesn´t
works...I´m really a asn
Use logical indexing. (Using 'dat' because 'data' is bad practice as
an object name.)
dat2 <- dat[ rowSums(dat) >16 | rowSums(dat) < 28 , ]
else if(data[i,]=data[-i,])
The i- else construct only works on scalars. If you give them vectors
they only use the first value and then they warn. You can use ifelse
on vectors.
You see imagine my data matrix is 10x4 and only 3 rows passes the
condition...the resulting matrix will be 3x4
I tried also to save the new matrix as csv like this
write.csv(data, file = "input1.csv")
How should I proceed to save as a txt?
Many thanks I really like this problems but I feel my mind is
restricted to
more easy things¡¡¡jajaj
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David Winsemius, MD
West Hartford, CT
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