I'm having difficulty using Under where it seems that it should be
natural to do so. I vaguely recall this difficulty being discussed
here before, but I don't recall the answer.
load 'dates'
]now=: <.6!:0''
2009 3 9 11 14 34
NB. I can accomplish the desired program as shown below.
wf=: ([: todate (7*[) + todayno@(3&{...@])) , 3&}...@]
5 wf now
2009 4 13 11 14 34
NB. What I can't do is rely on this relationship
dn =: todayno :. todate
NB. to rely on Under along these lines:
weeksfrom=: ((7*[) (+[)&....@] 3&{...@]) , 3&}...@]
NB. However, the left parameter (result of (7*[)) is obscured by the
use of &. (i.e. inaccessible when the addition is to occur)
Can Under be used in a circumstance like this?
Tracy
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