[R] Choosing rows

[oslo]

Hi all;
I have a big data set (a small part is given below) and V1 column has repeated info in it. That is rs941873, rs12307687... are repeating many times. I need choose only one SNP (in first column named rs) which has the smallest  Pvalue withing V1 column. That is I need choose only one SNP for repeated names in V1 which has the smallest Pvalue.
Your helps are truly appreciated,Oslo

|  rs  | n0 | Pvalue | V1 |
|   rs941873  | 81139462 | 1.52E-07 | rs941873 |
|   rs634552  | 75282052 | 1.08E-01 | rs941873 |
|   rs11107175  | 94161719 | 2.85E-02 | rs941873  |
|   rs12307687  | 47175866 | 1.23E-01 | rs12307687 |
|   rs3917155  | 76444685 | 6.80E-01 | rs941873  |
|   rs1600640  | 84603034 | 2.75E-04 | rs12307687 |
|   rs2871865  | 99194896 | 7.09E-02 | rs12307687 |
|   rs2955250  | 61959740 | 3.17E-02 | rs12307687 |
|   rs228758  | 42148205 | 7.72E-02 | rs12307687 |
|   rs224333  | 34023962 | 2.10E-02 | rs10071837 |
|   rs4681725  | 56692321 | 4.45E-04 | rs10071837 |
|   rs7652177  | 171969077 | 6.34E-04 | rs10071837 |
|   rs925098  | 17919811 | 5.55E-09 | rs925098 |
|   rs1662837  | 82168889 | 8.66E-05 | rs925098  |
|   rs10071837  | 33381581 | 5.74E-04 | rs925098  |


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