Looks like you have problems with indexing. In your code, fc is a
vector of length 2, pv is a scalar(it only keeps the last value of the
loop), then you try to cbind different lengths of vectors
(row.names(y1), fc and pv). cbind only works for vectors with the same
length.
I don't know what you wa
thanks for the replies so, i remove the indices pv[i] and
fc[i]..but when i run it like this:
===
fc=0
pv=0
for (i in 1:nrow(data))
{
v1= c(y1[i,1], y1[i,2])
v2= c(y2[i,1], y2[1,2])
fc=v1-v2
w=t.test(v1,v2)
pv=w$p.value
}
results =
In your loop, you assign, for example, pv twice
pv=w$p.value # pv is scalar
pv[i]= w[2] # pv is a vector
give an example for the point
pv=1
pv[5]=2
pv
[1] 1 NA NA NA 2
This may not be what you want.
Weidong
On Thu, Oct 27, 2011 at 7:40 AM, Seb wrote:
> y1,y2 were designed as follow,from t
y1,y2 were designed as follow,from the original data file :
y1=data[,1:2]
y2=data[,3:4]
...I am a bit confused with what "redesign the whole vector again" and
"specify indices twice " actually mean?...could u point it out in the
script?
Thanks so much I really appreciate it!!
Sent from my -DROID
If you provide an example data (y1 and y2 in the loop), you might have
got specific helps already. A few things in your loop seem suspicious.
fc and pv are vectors, and in each loop you redesigned the whole
vectors and specific indices twice. That may cause your problems.
Weidong Gu
On Wed, Oct
"affy" is a bioconductor package. You should be asking this question
on the bioc mailing list.
--
David.
On Oct 26, 2011, at 4:56 PM, Seb wrote:
hi all
i started recently using R and i found myself stuck when i try to
analyze microarray data.
i use the "affy" package to obtain the intensit
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