Hello,
I would like to please ask if someone would explain how r reads characters
and numbers differently. Using read.csv, I had a matrix that resembled the
following, only with many more ids and data:
ID
Visit
variable
2
1
5
2
1
3
2
3
4
2
41
1
2
42
34
2
5
54
2
9
1
2
10
3
2
12
5
5
1
54
5
2
9
5
3
3
5
41
54
5
41
2
5
5
235
5
9
4
5
10
2
5
12
2
I then tried to subset for Visit==3. However, subset == was not working
properly. This gave me zero rows. I printed the matrix/dataframe and
found that this was because r viewed the 3 as " 3" (space three). So, I
had to type subset == " 3" to select for the data instead. I think this
has to do with character, number and string properties, but I am quite a
novice. Would anyone be able to instruct me how one tells a
dafaframe/matrix to convert numbers such as " 3" to "3" so that I do not
get confused in the future? I guess another problem I have is that I am
still learning the differences between matrices and dataframes.
Thanks so much, Matt
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