[R] how to read file & append at specified positon

[sagarnikam123]

i have one file as
> munnabhai<-read.table(hyphen[1],skip=1)
> munnabhai
     V1     V2  V3 V4         V5           V6 V7
1     1 12AS_A   4  A    0.00000  157.8994119  2
2     2 12AS_A   5  Y  -41.61818  -56.8011795  1
3     3 12AS_A   6  I  -55.47021  -51.1328352  1
4     4 12AS_A   7  A  -54.43085  -58.3428366  1
5     5 12AS_A   8  K  -54.31525  -39.2709474  1
6     6 12AS_A   9  Q  -61.37700  -33.5304490  1
7     7 12AS_A  10  R  -86.14173  -32.3448242  1
8     8 12AS_A  11  Q  -52.88589  -57.2830246  1

want to read v7 vector & add V8,
& edit it as in the same file

     V1     V2  V3 V4         V5           V6 V7	V8
1     1 12AS_A   4  A    0.00000  157.8994119  2	2.3  
2     2 12AS_A   5  Y  -41.61818  -56.8011795  1	45.5
3     3 12AS_A   6  I  -55.47021  -51.1328352  1	78.5	
4     4 12AS_A   7  A  -54.43085  -58.3428366  1	7.3
5     5 12AS_A   8  K  -54.31525  -39.2709474  1	8.9
6     6 12AS_A   9  Q  -61.37700  -33.5304490  1	4.5	
7     7 12AS_A  10  R  -86.14173  -32.3448242  1	7.3	
8     8 12AS_A  11  Q  -52.88589  -57.2830246  1	1.0


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