When I replicated the timings given at the end of this chapter, their relative rankings were drastically different from what is shown in the essay, so I added the following note: *[Be aware that the relative timings may differ for different versions of J depending on code optimizations.] *
For anyone who is interested, the two sets of relative timings are: time each '9 comb 23';'9 comb2 23';'9 combi 23' NB. From Ch. 34 +--------+--------+--------+ │0.251543│0.173648│0.199808│ +--------+--------+--------+ (];~2%/\]) 0.251543 0.173648 0.199808 +----------------+--------------------------+ |1.44858 0.869074|0.251543 0.173648 0.199808| +----------------+--------------------------+ (];~2%/\]) >(10) time each '9 comb 23';'9 comb2 23';'9 combi 23' NB. On my machine +--------------+------------------------------+ |1.26964 425.37|0.108453 0.0854202 0.000200814| +--------------+------------------------------+ JVERSION Engine: j804/j64/windows Release: commercial/2015-12-21 16:18:48 Library: 8.04.15 Platform: Win 64 Installer: J804 install InstallPath: c:/users/devon_mccormick/j64-804 Contact: www.jsoftware.com -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
