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2009 Jun 18
3
merging data.frames of different length
hi,
I have two data.frames each with two columns;
x1
1 4
1 3
1 6
2 9
2 2
2 5
3 6
3 7
3 4
x2
1 -3
1 -7
2 -3
2 -2
2 -8
3 -1
3 -2
3 -1
now I want to merge this data.frames to one data.frame.
The problem is, that sometimes there is a different number of elements
per category.
(like above x1 has 3 values for the value 1 in the first row, but x2
has only 2 values for the value 1 in the
2006 Nov 20
4
how to use the switch statement
Good morning,
I am trying to recode the values of a column in a data frame and,
instead of using a long series of if/else statements I would like to use
a switch (as it is, for instance, in the C programming language).
I have a column of this type:
AT
BB
B1
B1
CC
CC
T6
B1
CC
BB
TT
AT
AT
AT
TT
BB
...
and I need to change this coding (if it's AT then it should be A1, if
it's BB then