jia ding wrote:
> Then, I use command:
> score<- read.csv('file.csv', header = FALSE,sep = ",")
> hist(score, main = "score")
>
> it gives error msg:
> Error in hist.default("score", main = "score") :
> 'x' must be numeric
>
> Can any of you know about it explain me why?
Have a look at 'score' in R first. You might get this:
> score
V1
1 31.8450
2 24.5980
3 29.1223
4 24.7150
5 23.1847
6 24.2321
7 25.2995
8 23.4261
9 30.7873
- read.csv reads things in into "data frames" - a bit like a matrix.
You've read your data into a data frame with one column, so you can do:
hist(score$V1)
since V1 is the name of the column.
If your data is just one column, then you could do:
score = scan("file.csv")
and then
hist(score)
since scan() has read it into a single vector, not a data frame.
Barry
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