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

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.
 
 
 
Hui Xue
	[[alternative HTML version deleted]]

the vectors in you first example look like a long character string since I only
see quote marks at the beginning and end and notbon the individual objects, but
it is hard to tell since it appears to be in HTML.

Sent from my iPad

On Dec 4, 2013, at 1:52, "snow" <7146781 at qq.com> 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.
> 
> 
> 
> Hui Xue
>    [[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

On 04-12-2013, at 07:52, snow <7146781 at qq.com> 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

> 
> Hui Xue
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.