hi, 

I'm trying out matrices (without typed racket, though I read the performance 
caveat -- I'm not worried about performance at the moment) and am trying to 
find the best idioms for a small function I'd like to build.

Q1: is there an elegant away to assemble a matrix column-wise? (my first draft 
solution is to read one col-matrix and write cell by cell into a destination 
(mutable) matrix); my preference would be to use immutable items, but that's 
secondary to elegance at this point.

cheers,

Tim

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