R help - Oct 2012 - other way of making a table?

I'm making tables for prediction results of classifiers (2 classes) that
show the usual numbers, true positives, false positives, etc

I used the command

table(predictedLabels,realLabels)

to make those.

I just had a case though ,where one of the label vectors had only one class in
it. This will result in only half a table.

Compare:
x<-c(1,1,1,0,0)
y<-c(1,1,1,0,1)
table(x,y)

to 

x<-c(1,1,1,0,0)
y<-c(1,1,1,1,1)
table(x,y)

I want the second one to still have all 4 cases (second column all zeros then).

Any easy solutions?

Use factors?
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Jessica Streicher <j.streicher at micromata.de> wrote:
>I'm making tables for prediction results of classifiers (2 classes)
>that show the usual numbers, true positives, false positives, etc
>
>I used the command
>
>table(predictedLabels,realLabels)
>
>to make those.
>
>I just had a case though ,where one of the label vectors had only one
>class in it. This will result in only half a table.
>
>Compare:
>x<-c(1,1,1,0,0)
>y<-c(1,1,1,0,1)
>table(x,y)
>
>to 
>
>x<-c(1,1,1,0,0)
>y<-c(1,1,1,1,1)
>table(x,y)
>
>I want the second one to still have all 4 cases (second column all
>zeros then).
>
>Any easy solutions?
>
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