Do you think it's possible to create a gambas module, similar to "gb.db.sqlite3" or "gb.cairo" but , lets say "gb.gsl" or "gb.math" ? These gb.moduls seems to be able to use C++ Libraries.
Ok, most of the people which are able to to this, usually do not have time to do it. I have time but no experience, maybe some help in beginnig might be sufficient - at least for some simple finctionality. But may be this requires too much experience and i might not be helpful at all. What do you think ? > Gambas had tools like GSL, Armadillo, PyLab, and Numpy On Monday, January 23, 2012 01:03:06 Randall Morgan wrote: > Wally, > > SG and RDP both would do a decent job for you since you need to preserve > your peaks. I don't have code for this but you can find psuedo code for it > on Wikipedia. The sudo code should be easy to convert into Gambas. It would > be nice if one Gambas had tools like GSL, Armadillo, PyLab, and Numpy. I > think it will get there but not anytime soon. Still RDP does not need any > external libraries. You can use the built in math functions. You don't need > a coefficients like you do with SG. SG will give better over-all > smoothing. But under Gambas would require a lot more work. > > As for porting GSL to Gambas that is not a trivial task. Not impossible but > it's not something you'll do in a few hours... I've ported much of the TIdy > Library to Gambas for use with data extraction and web crawling. But it > took me weeks to do only a portion of the library. > > Hope this helps > > On Mon, Jan 23, 2012 at 12:38 AM, Wally <[email protected]> wrote: > > The signal data i want to process comes from a HPLC detctor, which > > generates analog voltage outputs. e.g. every second one meqasurement. > > The data is typical chromatography data as generated by several > > spectroscopic methods. > > The time base can be set to different values but mostly i use 1 Hz. > > A 16bit ADc convert this analog data to digital float values > > So i get a list of "Y"values with constant time-delta. > > The data is noisy - so i uesed in 1st step Sawatzky-Golay smoothing. > > > > These data contains usually few peaks which i need to find. I need > > maximumvalue, time value of maximum, half-height-width and area of > > every single peak. Sometimes peaks are very close so area is > > overlapping. > > > > The fityk-package is doing all this jobs very simple but i can not use > > in > > gambas. Another candidate, which is suitable to use with ganbas is > > Gnu Scientific Library. There are a lot of numerical functions > > available, > > but accessing this functions, was so far, too difficult for me to code > > with > > gambas. I always mess up all the pointer stuff needed to declare and > > access this functionality. So i ask here to find a simple plain C > > library or Gambas-, even VB-code to do this jobs. > > > > wally > > > > On Monday, January 23, 2012 00:06:49 Randall Morgan wrote: > > > Most of the stuff I did in signal processing was on the 68000 and > > > Z80's.> > > So > > > > > I let most of that go a very long time ago. Besides, unless you know > > > what you are looking for in a smoothing algorithm, any code would > > > be useless. For example, the simplest algorithm for smoothing is > > > the moving average method. It's very simple to write in any > > > programming language. Simple decide on the number of data points > > > you are going to track and then> > > average > > > > > the value of that many points. That average becomes you first point. > > > > Slide > > > > > the window up one value (or more, as long as there is plenty of > > > overlap), allowing the low value(s) to fall out of the window, then > > > calculate the average again. and plot your next point. Continue > > > until you're out of> > > input > > > > > data. > > > > > > This issue with the moving average method is that you will flatten > > > your > > > data and loose your peaks. Since you have not said what your data is > > > > being > > > > > used for or how you are getting it, it is impossible to guess what > > > method of smoothing would be appropriate. So you need to ask > > > yourself, are my peaks important? Is my data timed? What am I doing > > > with it once I smooth> > > it > > > > > out? If you are displaying it, what information in your data is > > > important to convey to the viewer? Etc... Without details no one > > > can really help> > > you. > > > > > Give me specifics and perhaps I can be of more help. > > > > > > On Sun, Jan 22, 2012 at 11:44 PM, Wally <[email protected]> wrote: > > > > I assume you do not have a code example, right ? > > > > > > > > On Sunday, January 22, 2012 17:02:17 Randall Morgan wrote: > > > > > Just a thought, > > > > > > > > > > You could write a callable wrapper around numpy then call > > > > > that from > > > > > > > > Gambas. > > > > > > > > > Would give you all the power of the python numerical library > > > > > from > > > > > within Gambas. > > > > > > > > > > On Sun, Jan 22, 2012 at 2:18 AM, Randall Morgan > > > > > <[email protected]> > > > > > > > > wrote: > > > > > > Not with Gambas and it's been a long while. But if you > > > > > > understand the > > > > > > algorithms used and the type of curve fitting you desire > > > > > > for > > > > > > your > > > > > > problem > > > > > > domain then implementing it in Gambas is not a problem. > > > > > > > > > > > > You may want to google curve fitting algorithms. You > > > > > > need to > > > > > > know if > > > > > > > > you > > > > > > > > > > want a linear, polynomial, rational, cubic, or nonlinear > > > > > > fitting. Then find a C/C++/Python implementation and > > > > > > flow chart > > > > > > the algorithm. Then you can easily convert it to Gambas > > > > > > or any > > > > > > programming language.> > > > > > > > > > > > > > > On Sun, Jan 22, 2012 at 12:54 AM, Wally <[email protected]> wrote: > > > > > >> Does anyone have experience with curve fitting and/or > > > > > >> peakfinding > > > > > >> using gambas ? (e.g. example code) > > > > > >> > > > > > >> Is there a plain C library (Linux) known, suitable to > > > > > >> this > > > > > >> problem > > > > > >> and gambas ? > > > > > >> > > > > > >> Something like "fityk" (which is written in C++) but > > > > > >> written > > > > > >> in plain C > > > > > >> to use with "EXTERN" > > > > > >> > > > > > >> I might wrap the fityk C++ or try Gnu Scientific > > > > > >> Library, but > > > > > >> i'm > > > > > >> still > > > > > >> searching for alternatives. > > > > > >> > > > > > >> wally > > > > > >> > > > > > >> > > > > > >> > > > > > >> ------------------------------------------------------ > > > > > >> -------- > > > > > >> -------- -------- Try before you buy = See our experts > > > > > >> in > > > > > >> action! > > > > > >> The most comprehensive online learning library for > > > > > >> Microsoft > > > > > >> developers > > > > > >> is just $99.99! Visual Studio, SharePoint, SQL - plus > > > > > >> HTML5, > > > > > >> CSS3, > > > > > >> MVC3, > > > > > >> Metro Style Apps, more. Free future releases when you > > > > > >> subscribe now! > > > > > >> http://p.sf.net/sfu/learndevnow-dev2 > > > > > >> _______________________________________________ > > > > > >> Gambas-user mailing list > > > > > >> [email protected] > > > > > >> https://lists.sourceforge.net/lists/listinfo/gambas-us > > > > > >> er > > > > > > > > > > > > -- > > > > > > If you ask me if it can be done. The answer is YES, it > > > > > > can > > > > > > always be > > > > > > done. The correct questions however are... What will it > > > > > > cost, > > > > > > and how > > > > > > long will it take? > > > > ------------------------------------------------------------------------ > > > > > > ------ Try before you buy = See our experts in action! > > > > The most comprehensive online learning library for Microsoft > > > > developers is just $99.99! 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