Re: [Bug-apl] Problem with modulo arithmetic on Gaussian integers redux

[Juergen Sauermann]

Hi Jay, Fred, thanks a lot, Jay, for figuring this out. Fred, I made the change proposed by Jay. Please let me know if the problem persists. SVN 958. /// Jürgen On 06/14/2017 03:13 PM, Jay Foad wrote: It got broken in r939. The problem is in Cell.icc: //----------------------------------------------------------------------------- inline bool Cell::integral_within(APL_Complex A, APL_Float B) { const APL_Complex C = -A;    return tolerant_floor(C, B) == tolerant_floor(A, B); } //----------------------------------------------------------------------------- You're missing a minus sign before the second "tolerant_floor". Jay. On 14 June 2017 at 13:04, Juergen Sauermann <juergen.sauerm...@t-online.de> wrote: Hi Fred, not sure what to do about that. On my machine I am getting:       1J3 ∣ 8J4 0 and your TGI0.apl program seems not to output anything. Best Regqrds, Jürgen Sauermann On 06/14/2017 05:52 AM, Frederick Pitts wrote: Juergen, I'm seeing errors with the mod (∣) operator applied to Gaussian integers again. With svn 896, the mod operator yields a nonzero residual result while the division operator yields an exact Gaussian integer quotient result as follows       1J3 ∣ 8J4 1J3       8J4 ÷ 1J3 2J¯2       1J3 × 2J¯2 8J4 I'm running Fedora 25, 64 bit, on an Intel Core i7-6700 4 core CPU with 16 Gbyte memory. The attached TGI0.apl generates many more failure examples if needed. Regards, Fred