You are right. J does it the efficient way. The result is AS IF it
started with the largest, but it actually builds the result back-to-front.
Note that u/\ can't do this. Except for special values of u that are
known to be associative, u/\ has to evaluate each prefix in its entirety.
From your previous post: u/\. does combine u/ and u\. . The result for
each suffix is stored into the result for u/\. and then forwarded to the
next execution of u .
Henry Rich
On 2/20/2018 11:18 AM, Arnab Chakraborty wrote:
Hi,
I am curious about HOW the following is handled by J:
+/\. i.10
As the dict says, +/ is applied to all the suffixes *starting with* the
entire i.10
and working down to just 9. The efficient way is of course the other way
around.
So what does J actually do?
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