[R] How to calculate min of a dataset that contains empty column

[timholland]

Presumably there is no reason to attempt plotting an empty column, so best
approach is probably to remove the columns that contain no values.  

Try
> f.temp<-f[,-which(apply(f,2,function(x)all(is.na(x))))]

and then run your script for f.temp instead of the original f.  

Also, you may find you have to use
> min(x, na.rm=T) 
instead of just
> min(x)
for any other columns that contain NA values as well as real values.  





Chris Li wrote:
> 
> Hi all,
> 
> I have got a dataset like the following:
> 
> a  b  c
> 1      5
> 2
> 3      7
> 
> I am taking the minimum of each column and use it as the minimum of the
> y-axis of my graphs. My scripts (simplified version) are like the
> following:
> 
> f<-array
> f[1]=a
> f[2]=b
> f[3]=c
> for i in 1:3
> name=f[i]
> ymin<-min(dataset$f[i])
> plot(x,y,ylim=c(ymin,100))
> 
> The script stops at b, because the min function returns inf value. What
> can I do to overcome it?
> 
> Many thanks,
> Chris
> 

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