model.matrix(.) and all that

[Martin Maechler]

Maybe just a minor thing,
but since we are aiming for  S compatibility, here :

       R> x_ 1:5
       R> model.matrix(x ~ x)
       Error: length of namelist must equal dims

whereas in  S,

	model.matrix(x ~ x)  ===  model.matrix(x ~ 1)
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
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