Subset a dataframe by multiple factor levels

Question

How can I avoid using a loop to subset a dataframe based on multiple factor levels     In the following example my desired output is a dataframe   The dataframe should contain the rows of the original dataframe where the value in  Code  equals one of the values in  selected    Working example      sample data Code lt -c  A   B   C   D   C   D   A   A   Value lt -c 1  2  3  4  1  2  3  4  data lt -data frame cbind Code  Value    selected lt -c  A   B    want rows that contain A and B   Begin subsetting result lt -data which data Code  selected 1     s1 lt -2 while s1 lt length selected  1      result lt -rbind result data which data Code  selected s1        s1 lt -s1 1     This is a toy example of a much larger dataset  so  selected  may contain a great number of elements and the data a great number of rows   Therefore I would like to avoid the loop

User · Answer

Here s another   data data Code     A    data Code     B       It s also worth mentioning that the subsetting factor doesn t have to be part of the data frame if it matches the data frame rows in length and order  In this case we made our data frame from this factor anyway  So   data Code     A    Code     B       also works  which is one of the really useful things about R

User · Answer

Try this    gt  data match as character data Code   selected  nomatch   FALSE         Code Value 1      A     1 2      B     2 1 1    A     1 1 2    A     1

User · Answer

You can use  in     data data Code  in  selected     Code Value 1    A     1 2    B     2 7    A     3 8    A     4

[r] Subset a dataframe by multiple factor levels

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