[R] merge function

[Michael Dewey]

On 01/06/2015 14:46, carol white via R-help wrote:
> Hi,By default the merge function should take the intersection of column names

  (if this is understood from by = intersect(names(x), names(y)),

Dear Carol
The by parameter specifies which columns are used to merge by. Did you 
understand it to be which columns are retained in the result?

Just a hunch, and if not then you need to give us a toy example.



  but it takes all columns. How to specify the intersection of column names?
>   Thanks
> Carol
>
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Michael
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