[R] resizing data
arun
smartpink111 at yahoo.com
Sat Jan 26 00:18:08 CET 2013
Hi,
Inline:
----- Original Message -----
From: emorway <emorway at usgs.gov>
To: r-help at r-project.org
Cc:
Sent: Friday, January 25, 2013 5:29 PM
Subject: Re: [R] resizing data
I played around with your example on the smaller dataset, and it seemed like
it was doing what I wanted. However, applying it to the larger problem, I
didn't get a resized 2D dataset that preserved the order I was hoping for.
Hopefully the following illustrates the larger problem:
x<-matrix(0,nrow=29328,ncol=7)
# Now set the 70,000th element to 1 to find out where it ends up?
# Iterating on columns first, then rows, the 70,000th element is
# at index [10000,7]
x[10000,7]<-1
y<-t(matrix(x,nrow=546))
It should be:
x2<-unlist(x)
which(x2==1)
#[1] 185968
29328*6+10000
#[1] 185968
If it was transposed:
x3<-unlist(t(x))
which(x3==1)
#[1] 70000
A.K.
dim(y)
# [1] 376 546
# Does 1 appear at index [129,112] as I expect
# (128 complete rows x 546 cols = 69888 + 112 = 70,000) thus, row 129, col
112
y[129,112]
# [1] 0
# No, so where is it?
grep(1,y)
# [1] 123293
Where is that?
--
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