Search found 164 matches

by ijabbott
Thu Jul 04, 2019 11:32 pm
Forum: Usage tips, tricks and problem reports
Topic: Solver and Integrator: Program questions
Replies: 10
Views: 1407

Re: Solver and Integrator: Program questions

With something like a solver, the algorithm is everything. Whether you code it in assembly language, SysRPL, or C, is just an implementation detail. I bet the HP Solve algorithm has evolved since the 34C. It would be interesting to see the commented source code for the various implementations over ...
by ijabbott
Wed Jul 03, 2019 8:31 pm
Forum: Usage tips, tricks and problem reports
Topic: Solver and Integrator: Program questions
Replies: 10
Views: 1407

Re: Solver and Integrator: Program questions

The solver and integrator are probably implemented in some pre-HP48 version of System RPL (SysRPL), or possibly Saturn assembly language for speed. ... I assume the basic procedures are older since they were implemented on HP-34C and -15C before the rise of RPL already. I don't think HP did redesig...
by ijabbott
Wed Jul 03, 2019 7:55 am
Forum: Usage tips, tricks and problem reports
Topic: Solver and Integrator: Program questions
Replies: 10
Views: 1407

Re: Solver and Integrator: Program questions

I had hoped, that there would be an alternative implementation of the Solver/Integrator in FOCAL out there "in the wild" ... but I didn't find some, too. The solver and integrator are probably implemented in some pre-HP48 version of System RPL (SysRPL), or possibly Saturn assembly language for spee...
by ijabbott
Fri Jun 28, 2019 8:10 pm
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

The perhaps only remaining concern might also be typographical, that these arrows don't seem to be easily represented in HTML (so that the community can contribute docs and examples), e,g, like HTML entities. The f and g do, of course. ... I just found the ↰ and ↱ HTML entities, seemingly e...
by ijabbott
Sun Jun 09, 2019 8:41 pm
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

Ian Abbott wrote elsewhere: It would be nice if the WP-43S could support [Re⇄Im] on any number type, not just the complex types. There are various other functions on the CPX menu that could be changed to work on non-complex types too. What shall this function do then? What "various other functions"...
by ijabbott
Wed May 29, 2019 11:59 am
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

I don't know about the rest of the world, but there is also "Czech notation" which is like American/English notation but replaces square brackets with angle brackets. I learnt <-π, π] (in Norway). So that's four different notations so far. ISO 80000-2 only lists the (] and ]] styles (hooky scanned ...
by ijabbott
Wed May 29, 2019 7:48 am
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

You might also see it written as: ]-π, π], but I think (-π, π] is the more common style. Not where I learned maths :) I always learned it as ]-π, π] and had never seen (-π, π] until this discussion cropped up. I find the former notation more intuitive and indicative of its meaning. I think "]-π, π]...
by ijabbott
Tue May 28, 2019 11:28 pm
Forum: Discuss!
Topic: Another 43S poll
Replies: 10
Views: 1981

Re: Another 43S poll

It took me ages to twig why XEQ was so labelled on HP calculators!
by ijabbott
Tue May 28, 2019 11:18 pm
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

ϑ ∈ (-π, π] is equivalent to -π < ϑ ≤ π. Thank you for explaining. I never knew. You might also see it written as: ]-π, π], but I think (-π, π] is the more common style. The round bracket (parenthesis), or reversed square bracket means the value given at that end of the range is excluded from the i...
by ijabbott
Mon May 27, 2019 7:59 am
Forum: Discuss!
Topic: 43S News
Replies: 513
Views: 73135

Re: 43S News

5. Well, the names are similar. Thus, if you spend a prefix key [HYP] then it's a no-brainer to combine it with the trig keys. But that's all. If, however, the public would be roaring for the hyperbolics going into TRI , I might do though frowning... In a way, the normal trig functions are also exp...