Hi,
I have a data frame Y with the following information,

   ORF          spectra
1  YAL001C      2
2  YAL005C      21
3  YAL007C      2
4  YAL012W      8
5  YAL016W      24
6  YAL019W      3
7  YAL020C      2
8  YAL021C      7
9  YAL022C      3
10 YAL023C      6
11 YAL026C      2
12 YAL029C      1
13 YAL031C      1
14 YAL035W      48
15 YAL038W      173
16 YAL041W      4
17 YAL042W     4
18 YAL048C      1
19 YAL049C      1
20 YAL051W     1


In the other hand I have this object X with character elements as following

"YAL026C"
"YAL041W"
"YAL048C"
"YAL007C"
"YAL012W"
"YAL016W"

and I want to generate a new data frame exclusively with the elements from the 
object X and its respective spectra value from the data frame Y. how to do it?

I have tried to look into several functions, match, subset, command Y[ X, ], 
and I still can not get it


thanks in advance

Roberto










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