[R] I had 1 problem with r

[정수빈]

Hi My name is SuBin-Jung from Korea.
 
I can't write english well. so, understand me please.
 
I used R Gui(64-bit) program.
 
And in program, I imported this csv file named "emp.csv"
 
emp.csv
---------------------------------------------
empno,ename,job,mgr,hiredate,sal,comm,deptno
7369,SMITH,CLERK,7902,1980-12-17,800,,20
7499,ALLEN,SALESMAN,7698,1981-02-20,1600,300,30
7521,WARD,SALESMAN,7698,1981-02-03,1250,500,30
7566,JONES,MANAGER,7839,1981-03-02,2975,,20
7654,MARTIN,SALESMAN,7698,1981-10-22,1250,1400,30
7698,BLAKE,MANAGER,7839,1981-05-01,2850,,30
7782,CLARK,MANAGER,7839,1981-09-06,2450,,10
7788,SCOTT,ANALYST,7566,1982-12-08,3000,,20
7839,KING,PRESIDENT,,1981-11-17,5000,,10
7844,TURNER,SALESMAN,7698,1984-10-08,1500,,30
7876,ADAMS,CLERK,7788,1983-01-12,1100,,20
7900,JAMES,CLERK,7698,1981-12-03,950,,30
7902,FORD,ANALYST,7566,1981-12-13,3000,,20
7934,MILLER,CLERK,7782,1982-01-25,1300,,10
----------------------------------------------
 
Then I used command "read.csv"  ==> read.csv("emp.csv")
 
And I tried to find emp$ename with first alphabet 'A'.
 
So I inserted this command on program :
 
> subset(emp, ename==grep("^A+",ename,value=TRUE), select=c("ename","sal")) 
 
But the result is not found.
 
After that I tried to other alphabets( B,S,W....)
 
> subset(emp, ename==grep("^S+",ename,value=TRUE), select=c("ename","sal"))
 
Then I can find two data.
 
  ename  sal
1 SMITH  800
8 SCOTT 3000


Why can't I find emp$ename with first alphavet 'A'??
I think this is error. 
Please give me answer, sir. 

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