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[patch] Support many columns in model.matrix

Karl Millar 
Generating a model matrix with very large numbers of columns overflows
the stack and/or runs very slowly, due to the implementation of
TrimRepeats().

This patch modifies it to use Rf_duplicated() to find the duplicates.
This makes the running time linear in the number of columns and
eliminates the recursive function calls.

Thanks
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Thread (3 messages)

Karl Millar Support many columns in model.matrix Feb 26 Martin Maechler Support many columns in model.matrix Feb 29 Karl Millar Support many columns in model.matrix Feb 29