[R] how to change automatically 0=no and 1=yes

[Marc Schwartz]

On Wed, 2005-06-15 at 15:58 +0200, Muhammad Subianto wrote:
> Dear R-helpers,
> I have dataset (data.frame) like below,
>    x1  x2  x3   x4   x5  x6  x7  x8  x9 ... x1200
>     0    0    0    1    1    0    0    1    1
>     1    0    0    1    1    0    0    1    1
>     0    1    0    1    1    0    0    1    1
>     1    1    0    1    1    0    0    1    1
> ...
> How can I change automatically 0=no and 1=yes.
> 
> Thank you very much in advance.
> Kindly regards,
> Muhammad Subianto

The easiest might be to use the following, presuming that your data
frame is called 'df' and all entries are 0/1:

> df
   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1   1  0  1  1  1  1  0  1  1   0
2   1  0  1  0  0  0  1  1  0   0
3   0  0  1  0  1  1  1  1  1   0
4   0  0  0  0  1  1  0  1  0   0
5   1  1  1  1  0  1  0  1  1   0
6   1  0  1  1  1  1  0  1  1   1
7   0  1  1  1  0  0  1  0  1   0
8   1  1  1  1  0  0  1  1  0   0
9   1  0  1  1  1  0  1  0  1   0
10  1  0  0  1  1  1  1  1  0   1

# Use ifelse(). By default that will return a
# character matrix, so coerce back to a data
# frame. Note that the entries are "factors"

> as.data.frame(ifelse(df == 0, "No", "Yes"))
    V1  V2  V3  V4  V5  V6  V7  V8  V9 V10
1  Yes  No Yes Yes Yes Yes  No Yes Yes  No
2  Yes  No Yes  No  No  No Yes Yes  No  No
3   No  No Yes  No Yes Yes Yes Yes Yes  No
4   No  No  No  No Yes Yes  No Yes  No  No
5  Yes Yes Yes Yes  No Yes  No Yes Yes  No
6  Yes  No Yes Yes Yes Yes  No Yes Yes Yes
7   No Yes Yes Yes  No  No Yes  No Yes  No
8  Yes Yes Yes Yes  No  No Yes Yes  No  No
9  Yes  No Yes Yes Yes  No Yes  No Yes  No
10 Yes  No  No Yes Yes Yes Yes Yes  No Yes

See ?ifelse for more information.

HTH,

Marc Schwartz