[R] Problem with Freq function {prettyR}

James W. MacDonald jmacdon at med.umich.edu
Fri Jun 13 16:12:27 CEST 2008

Since this is a contributed package, you should be contacting the 
maintainer (as mentioned in the posting guide).

Anyway, the problem occurs because in the second case you have a factor 
in the first column and numeric in the second. This part of the code 
will illustrate what I mean:

for (i in 1:nfreq) {
         if (display.na)
             nna <- sum(is.na(x[[i]]))
         else nna <- 0
         xt <- na.omit(x[[i]])
         if (is.null(levels))
             levels <- unique(xt)
         if (is.numeric(x[[i]]))
             xt <- factor(xt, levels = levels)

So the first time through this loop the levels variable is set to 
c("m","f"). On the second time levels is no longer NULL, so when the xt 
variable is created it is essentially this:

xt <- factor(xt, levels = c("m","f"))

and since xt contains only numbers you get

[1] <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
Levels: m f



ukoenig at med.uni-marburg.de wrote:
> Does someone have an idea?
> Thanks a lot!
> Udo
> Quoting Udo <ukoenig at med.uni-marburg.de>:
>> Dear list,
>> I have a problem with freq from prettyR.
>> Please have a look at my syntax with a litte example:
>> library(prettyR)
>> #Version 1
>> test.df<-data.frame(q1=sample(1:4,8,TRUE), gender=sample(c("f","m"),8,TRUE))
>> test.df
>> freq(test.df) #No error message
>> #Version 2
>> test.df<-data.frame(gender=sample(c("f","m"),8,TRUE), q1=sample(1:4,8,TRUE))
>> test.df
>> freq(test.df)
>> Error message: "Error in vector("integer", length) : Vector size can´t be NA"
>> Can someone tell me, why an error message occurs in version two? I am
>> helpless...
>> Thanks in advance!
>> Udo K ö n i g
>> --------------------------------------------
>> Clinic for Child an Adolescent Psychiatry
>> Philipps University of Marburg / Germany
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James W. MacDonald, M.S.
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

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