other way of making a table?

Use factors?
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Sent from my phone. Please excuse my brevity.

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?