if statement - R: How to use IF correctly? -

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i have 2 columns of values this:

>bb           gdis      bdis              1   12.291488  8.009909       2   11.283319 13.625103      3   6.674549  8.629232      4   13.493121 17.175888      5   9.550731  9.867878      6   9.193895  9.785301      7   10.541702 10.941371      8   9.849527  9.496284       9   8.682287  8.133774       10  8.439381  4.335260

i need add column , call index calculates ratio gdis/bdis if gdis bigger, , bdis/gdis if bdis bigger.

how do that?

try

 transform(bb, index=ifelse(gdis>bdis, gdis/bdis, bdis/gdis))  #        gdis      bdis      adn  #1  12.291488  8.009909 1.534535  #2  11.283319 13.625103 1.207544  #3   6.674549  8.629232 1.292856  #4  13.493121 17.175888 1.272937  #5   9.550731  9.867878 1.033207  #6   9.193895  9.785301 1.064326  #7  10.541702 10.941371 1.037913  #8   9.849527  9.496284 1.037198  #9   8.682287  8.133774 1.067436  #10  8.439381  4.335260 1.946684

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