After a few months of hiatus, we finally get a chance to clean up the site, make the download page more accessible, and also to release some new information. Give us a few hours while we are at it. 🙂
Survey program listing for CASIO FX-880P. Forum: Search: FAQs: Links: MVPs: Menu. Survey program listing for CASIO FX-880P survey program listing for CASIO FX-880P SirYui (Marine/Ocean) (OP) 30 Jan 02 03:09. This website is designed to provide fully working and tested graphics calculator programs to increase the functionality of the fx-9860G series calculators from Casio. What sets this website apart from other sites is programs that are non-working, password protected or pointless are filtered out to bring you only the best software to help with. Casio FX-880P Pdf User Manuals. View online or download Casio FX-880P Owner's Manual. Using Data Bank Data in Programs. Conditional Search. Out of the box, the Casio FX-850P/FX-880P supports ten BASIC programs P0 to P9 and one MEMO databank. Research on the internals led to the insight that the pocket computer is capable of handling more than 10 programs, which can easily be accessed using the scientific library function. These programs can be.
The site re-organisation is needed for 2 main reasons: Many visitors come here for the free downloads and also the links to other Casio surveying site, so we need to have the download page more prominently placed. Secondly, we are releasing the old InSight code again, plus the programs passwords, and releasing InSight 1.3 soon (finally), which shall come with a few updates and 3 new programs. A good development of InSight is that we shall release it under a GNU-like license, which means the code will again be shared, and the full program is available for download here as soon as it is ready.
Another exciting development for us is that we shall begin offering Casio calculator here, but in limited amount only. Specifically we shall begin by offering FX-7400G+ and FX-9860G, at a price you will find reasonable. For FX-7400G+ we shall install InSightfor free before shipping it, while owner of FX-9860G can easily download it here and load the program with the USB cable which comes with the calculator.
In addition, we scrap the idea of writing programs for FX-5800P, mainly due to its slow processing speed (hey I did not know you guys work in the hot sun for that long!) and also for CFX-series since it is confirmed that Casio will phase out the CFX-series as soon as this year. As we speak now, it is virtually impossible to source for CFX-9850GB+. Not to worry, the FX-9860G is a well qualified and great replacement.
It happens that I quite like scientific calculators, and lately I’ve been adding a few to my collection. Several calculators are CAS (“Computer Algebra System”)-capable, meaning they are powerful enough to do symbolic / algebraic processing, and thus are able to understand and manipulate algebraic expressions containing any mix of unknowns, operators and numbers, and simplify, expand, and solve those in a general form. They normally can also do symbolic differentiation and integration, computing the general derivative/integral “function” from a expression first, before you can evaluate them at given points, if desired.
But I’ve always found quite fascinating that some less advanced calculators still offer the possibility of doing numerical integration and differentiation. They don’t know for instance that the derivative function of 3⋅x² is 6⋅x, but they can still tell you that when x = 2 the derivative of 3⋅x² is 12.
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Before you ask; I got into this rabbit hole because numerical differentiation and integration are kinda standard features nowadays of any decent calculator. It doesn’t need to be a high end or an expensive calc. In fact, I noticed that even my fx-570MS “entry level” scientific calculator I purchased like 10 years ago can do both operations, while three of my “high end” vintage programmable Casio calculators can’t. As they were “programmable” I think Casio kinda expected users to write their own programs for whatever “advanced” feature they needed. So I started wondering what is the method/algorithm used by current scientific calculators to compute these functions, so I could add the same functionality to my vintage calcs.
Now, I’ll focus on differentiation here because it’s way easier to deconstruct and understand how that works. A post about integration may follow, if this doesn’t turn out to be a massive borefest.
The concept of derivative
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So if you go back to the formal definition of a derivative;
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You’ll see that it basically attempts to find the “slope” of the function f(x) at a point x by evaluating the expression at x and (x+h) (as you would do with a straight line), and trying to reduce the difference in the X-axis between those two points (h) to a tiny fraction. In fact, it uses the concept of limit to find out where that expression converges when h approaches 0 (It never really gets there though, because the whole expression becomes a division by zero at that point). Read More