[R] modify a data frame by values in the columns

[Jason024]

I have a data frame like this:

    col1 col2
r1     2    1
r2     4    3
r3     6    5
r4     8    7
r5    10    9
r6    12   11
r7    14   13
r8    16   15
r9    18   17
r10   20   19

I want to modify this data frame, for example, assign every row in column
col1 and col2 to -1 if the values in col1 is less than 12 and values in col2
is greater than 10. The result should look like this:
    col1 col2
r1     -1    1
r2     -1    3
r3     -1    5
r4     -1    7
r5     -1    9
r6    12   -1
r7    14   -1
r8    16   -1
r9    18   -1
r10  20   -1

I have been struggling to make it to work. Any help is appreciated!

Jason


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