Netmeta in R

Question

[ren]

This is my database:

id<-c(1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15,15,16,16,17,17,18,18,19,19,19,20,20,21,21)
r<-c(71,57,68,53,53,17,25,5,58,9,34,12,17,3,27,1,43,12,32,10,40,25,24,19,16,8,35,57,6,5,5,25,15,11,16,37,9,80,58,101,41,21,48,49)
n<-c(331,329,215,209,218,73,65,25,225,74,159,166,67,23,83,25,127,58,220,148,209,207,33,30,21,21,59,77,26,32,26,36,22,15,18,94,47,169,170,169,57,56,63,63)
t<-c("certolizumab","Placebo","certolizumab","Placebo","certolizumab","Placebo","adalimumab","Placebo","adalimumab","Placebo","adalimumab","Placebo","infliximab","Placebo","vedolizumab","Placebo","vedolizumab","Placebo","vedolizumab","Placebo","aziothioprine/6MP","Placebo","aziothioprine/6MP","Placebo","aziothioprine/6MP","Placebo","Placebo","aziothioprine/6MP","methotrexate","aziothioprine/6MP","Placebo","methotrexate","Placebo","methotrexate","Placebo","infliximab","aziothioprine/6MP","infliximab+aziothioprine","infliximab+aziothioprine","aziothioprine/6MP","infliximab+methotrexate","infliximab")

Then I try to run pairwise with this code:

antiplatelet=pairwise(treat=t,event=r,n,studlab=id,sm="OR")

and I get an error saying:

Error in table(as.character(studlab), as.character(treat)) : 
  all arguments must have the same length

Does anyone know why?

[WouterDeCoster]

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Answer 1

[WouterDeCoster]

The error is exceptionally clear on what is wrong:

Error in table(as.character(studlab), as.character(treat)) :
all arguments must have the same length

If I check the length(id) I get 44, while length(t) is 42.