[R] Warnings by functions mean(), median()

[Kjetil Brinchmann Halvorsen]

mailpuls at gmx.net wrote:

> Hello,
>
> following functions doesnt work correct with my data: median(), 
> geo.mean().
>
> My datafiles contain more than 10.000 lines and six columns from a 
> flow-cytometer-measurment. I need the arithmetic and geometric mean 
> and median. For the calculation of the geometric mean i wrote 
> following function:
>
>     fix(geo.mean)
>
>     function(x)
>     {
>         n<-length(x)
>         gm<-prod(x)^(1/n)

This is probably what gives the NaN below.

exp(mean(log(x)))

would be more to the point.

Kjetil

>         return(gm)
>     }
>
> The function median() error tells me "need numeric data". The data are 
> numeric. The function geo.mean() gave out "[1] NaN". What are the 
> reasons and what are the solutions?
>
> I'am a newbie and need urgently information.
> Thanks.
>
> Here is an short output with the results:
>
> 9997   385.42   68.54   9.82  124.09  23.93  138.24
> 9998   342.89   73.65 133.35 1134.19 345.99 1876.88
> 9999   316.23   76.35  48.26  421.70 129.80  873.79
> 10000  291.64  103.66   6.85  107.46  26.42  189.38
> 10001    0.00    0.00   0.00    0.00   0.00    0.00
> > mean(data)
>       FSC       SSC       FL1       FL2      FL32       FL4
> 375.94880  73.76219  50.73413 434.42837 110.06393 637.34980
> > geo.mean(data)
> [1] NaN
> > median(data)
> Error in median(data) : need numeric data
> >
>
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-- 

Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
               --  Mahdi Elmandjra




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