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The tensor product of two arrays is notionally an outer product of the arrays collapsed in specific extents by summing along the appropriate diagonals.
Package details 


Author  Jonathan Rougier <j.c.rougier@bristol.ac.uk> 
Date of publication  20120505 06:18:31 
Maintainer  Jonathan Rougier <j.c.rougier@bristol.ac.uk> 
License  GPL (>= 2) 
Version  1.5 
Package repository  View on CRAN 
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