I'm sure this is easy, but I'm stumped after trying all sorts of
variations with no success. Here's a demo setup:
t1=: '2009-09-04';'2009-09-03';'2009-09-02';'2009-09-01'
t2=: '9345.36';'9282.03';'9306.21';'9492.32'
t=: t1 ,: t2
+----------+----------+----------+----------+
|2009-09-04|2009-09-03|2009-09-02|2009-09-01|
+----------+----------+----------+----------+
|9345.36 |9282.03 |9306.21 |9492.32 |
+----------+----------+----------+----------+
mm=. 1 1 1 1 0 1 1 0 1 1 NB. yyyy-mm-dd --> yyyymmdd
In the real world, t1 and t2 (and several additional rows) have over
20,000 values of market data. What I'm trying (unsuccessfully) to do
is to apply mm as a mask to each of the values of row 0{t using the #
(copy) verb. For example:
0{0{t is '2009-09-04' and mm # > 0{0{t is '20090904'
1{0{t is '2009-09-03' and mm # > 1{0{t is '20090903'
and so on.
I can't figure out how to make # apply to all the values in the row at
once (I can't even figure out how to do it with a 'for' loop)--no
matter what I've tried, I keep getting (length, syntax, and limit)
error messages. I'd appreciate any help that y'all can offer. Thanks
in advance!
Harvey
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