[R] Simple:: usage of stem() and hist()?

[Peter Dalgaard BSA]

Alan Davis <adavis at saipan.com> writes:

> I must apologize in advance for asking a simple question.  I am sure that a clue will be sufficient to get this show on the road.  I am trying to graph tide prediction data in various ways.  I haven't been able to answer this question after pouring over TFM.  
> 
> I read the datafile
>       theight <- read.table("tides",header=TRUE)
> 
> I do get a summary() or fivenum() 
>       summary(theight)
>       fivenum(theight)
> 
> But when I run
>       stem(theight), I receive CONSISTENTLY the following message, no matter when I have done: 
> 
>       > stem(theight)
>       Error in stem(theight) : stem: x must be numeric
> 
> The file looks like this:
>  Height
>  0.225970
>  0.141066
>  0.058758
>  -0.020346
>  -0.095795
>  -0.167275
>  -0.234242
>  -0.296408
>  -0.353290
>  -0.404554
>  -0.450036
>  -0.489219
>  -0.521996
>  -0.548133
>  -0.567431
>  ... 
>  etc
> 
> Perhaps there is some manipulation necessary to make the data into a vector, but it isn't obvious to me what to do. 
> 
> Thank you for any clue whatsoever.  


Try stem(theight$Height)

(read.table() returns a data frame. It could have multiple columns.)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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