Hello R experts,
  I want to add some extra words to number to existing column header. Can
anybody tell me how to do that.

e.g. if I have a data.frame
      Height.1 Height.2 Height.6 Height.8 Height.10 Height.11 Height.17
Height.20 Height.22 Height.31
MBR1        74       72        0      104         0       250       144
    0         0         0
MBR2         0       94        0      150         0       250       158
    0         0         0
MBR3        93      167        0      199         0       250       208
    0         0         0
MBR4       146      106        0      165         0       250       135
    0         0         0
MBR5       149      106        0        0         0       250       141
    0         0         0
MBR6       120        0        0       97         0       250       175
    0         0         0
MBR7       120        0        0       76       145       250       130
    0         0        79
MBR8        89       70        0      114         0       250       211
    0         0         0

I want to rename the heading as

      Height.1.D1 Height.2.D1 Height.6.D1 Height.8.D1 Height.10.D1
Height.11.D1 Height.17.D1 Height.20.D1 Height.22.D1 Height.31.D1
MBR1        74       72        0      104         0       250       144
    0         0         0
MBR2         0       94        0      150         0       250       158
    0         0         0
MBR3        93      167        0      199         0       250       208
    0         0         0
MBR4       146      106        0      165         0       250       135
    0         0         0
MBR5       149      106        0        0         0       250       141
    0         0         0
MBR6       120        0        0       97         0       250       175
    0         0         0
MBR7       120        0        0       76       145       250       130
    0         0        79
MBR8        89       70        0      114         0       250       211
    0         0         0
MBR9       168        0        0        0         0       250       137
    0         0         0
MBR11       78       68        0      117         0       250       161
    0        49         0

Any help will be really great.
Thanks,
Mitra

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