So, I'm delving into the PREDICT operations in the RPN, and have found something unexpected.
There are two ways of specifying the shift offsets - as a (positive) count of shifts and a list; or as a negative count and a base shift. CDEF:predict1=172800,86400,0,3,3600,x,PREDICT CDEF:predict2=86400,-3,3600,x,PREDICT My tests (using 1.4.trunk) indicate that the two above have identical behaviour. My question is, is this intended? In particular, when giving a negative shift count, should the resulting list of shifts be based at 0? Given this: CDEF:predict=s,-3,w,x,PREDICT I had expected to get shifts of s, 2s and 3s. Instead I get 0, s and 2s. Is this intentional, or a feature? As a corollary, it means that these two lines are also equal for ANY value of s CDEF:predict1=s,-1,3600,x,PREDICT CDEF:predict2=x,3600,TRENDNAN Thanks, Steve Steve Shipway University of Auckland UNIX Systems Design Team Lead s.ship...@auckland.ac.nz +64 (9) 3737 599 ext 86487
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