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Overgauss
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13 Sep 2006
Hey guys I just wanted to let you know that Frink has had a few updates, open up dialogue and hear your opinions on the topic.
A recent update has: Improved the Historical U.S. Price Data conversions to look up conversion rates in a static file (distributed with Frink). This means you don't have to connect to the internet to see how much 13 dollars was worth in 1898 for example. It needs JVM and I'm using Jeode. The author suggests that Java 1.5 version 2 be used. Is there an appropriate JVM released as an ipk that meets those requirements? Like I said I'm using Jeode but I haven't gotten into the meat of Frink yet and may be possibly missing something. IRn00b. Recently posted on the Frink Yahoo group. QUOTE XXXX wrote:
> how flexible is the 'standard' units file that comes with frink? I'd > like to add other units (mostly to do with energy densities, masses > of materials, etc). The standard units file is quite flexible. Hopefully, you shouldn't have to modify the units in there (unless you're, say, a surveyor and you want the "foot" to mean the "surveyfoot" .) It's rather easy to make your own list of additional definitions that will complement the standard distribution. You can then load this file using the -k [filename] switch from the command line, or using the "use file" menu option from the interactive GUI. I'd be happy to add or distribute libraries that you might build. > so.. what are the limits on the standard unit set? There are very few limits. You can even add new base dimensions at runtime. So, if you're working on warp drive physics, and you need to add "cochranes" as a measure of subspace distortion, you can do it. On the other hand, Frink runs on a variety of handheld devices, and one of the things that contributes most to its startup time and memory usage is the size of the standard data file, so I have to consider what units get added somewhat carefully. > And is there a > possibility of having standard distribution 'libraries' which contain > more detailed units for a given subject (ie: physics, chemistry, etc) > that you could require on demand? Absolutely. I recently added the ability to have libraries distributed within the standard distribution. At the moment, there aren't any, but I'll add them as they get good enough (and if they're not too big.) For the moment, I just have them downloadable from the web site. Some of the big questions are: 1.) Do these get written in an object-oriented fashion? For example, if we want to store the properties of Carbon, it might have a density, a number of protons and neutrons, etc., all of which may vary. (They may vary by isotope, or by temperature and pressure, or by allotropic form such as graphite or diamonds or buckyballs. Getting properties of these objects might have to be represented by functions.) Do we do this as new units such as "uraniumdensity" or as properties of an object like Uranium which is an instance of ... uh... what class? What should the inheritance hierarchy look like, if there is one? Since I haven't fully implemented inheritance, there's necessarily some delay in doing that. ![]() 2.) How stable and good do the libraries have to be to be allowed into the standard distribution? 3.) Should we have an external repository of libraries and a tool to download these files like Perl's CPAN or yum or apt-get? Should these be downloaded on a user-by-user basis or for the whole machine? Should they be downloaded on first request? Sometimes I look at the whole CRC Handbook of Chemistry and Physics and despair at how much effort it'll take to get all of that into Frink, but hopefully it'll happen someday. If someone has libraries to contribute, or would like some help in designing them, please let me know! |
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