R help - Dec 2013 - reply： Problems with intersections between two charcter vectors

Dec 04, 2013; 4:14pm Berend Hasselman"<bhh@xs4all.nl> wrote:
On 04-12-2013, at 07:52, snow <[hidden email]> wrote:
> I'm a beginner with R.
>
> I have two vectors in character format. I tried to get the intersection of
these two vectors using intersect（）. But there is no result. The process is
below:
>> a<-c("CREB2” ,“ELK1” ,“ELK4” ,“MYC” ,“NR4A1” ,“FOS” ,“SRF”
,“TAU” ,“STMN1” ,“CPLA2")> a[1] "CREB2” ,“ELK1” ,“ELK4” ,“MYC”
,“NR4A1” ,“FOS” ,“SRF” ,“TAU” ,“STMN1” ,“CPLA2">
b<-c("CAMK2”,“CPKC”,“CBL”,“STAT5A”,“FAK”,“ABL1”,“JUN”,“ELK1”,“MYC")>
b[1] "CAMK2”,“CPKC”,“CBL”,“STAT5A”,“FAK”,“ABL1”,“JUN”,“ELK1”,“MYC">
intersect(a,b)character(0)
> However when I tried intersect（）with another two vectors, it works. The
example is like this:
>> c<-c("a", "b", "e", "c",
"e", "f")> c[1] "a" "b" "e"
"c" "e" "f"> d<-c("a",
"g", "f", "b", "e")> d[1]
"a" "g" "f" "b" "e">
intersect(c,d)[1] "a" "b" "e" "f"
> I think something must be wrong in my way with first two vectors(a,b).
Could anyone give me a kind help to tell me the reason for that? Thank you very
much.
>
What is displayed in Apple Mail is a mess since you posted in html.

It seems that some of your double quotes “ have been converted somewhere to
typographic double quotes (or however they should be called).
Some of your output is weird: a[1] would display “CREB2” only and not what you
show in your mail.

Doing it like this using proper ascii double quotes:

a<-c("CREB2" ,"ELK1" ,"ELK4" ,"MYC"
,"NR4A1" ,"FOS" ,"SRF" ,"TAU"
,"STMN1" ,"CPLA2")
b<-c("CAMK2","CPKC","CBL","STAT5A","FAK","ABL1","JUN","ELK1","MYC")

intersect(a,b)

displays:

[1] "ELK1" “MYC"

which is what you expected?

Berend


Thank you very much, Berend. I have tried your way and it did work. I think that
something wrong in my word setting cause that probelm. I really appreciated the
warm hearted help from you and jholtman.
 
sincerely,
 
Hui Xue
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