Pietro Battiston

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gvb

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gvb [2010/10/23 20:00] – modifica esterna 127.0.0.1gvb [2014/11/14 13:42] (versione attuale) – typo pietro
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 +{{:gvb:gvb-1.4.tar.gz|Click here to download version 1.4 of gvb.}}
 +
 +{{:gvb:gvb_1.4-1_all.deb|Click here for the Debian/Ubuntu package.}}
 +
 ==== What is GVB? ==== ==== What is GVB? ====
 GVB (Good ViBrations) is a small program to simulate vibrations in 1 and 2 dimensions, written by me (Pietro Battiston) in March 2008 as a university "homework". Here are some [[gvb:screenshots]]. GVB (Good ViBrations) is a small program to simulate vibrations in 1 and 2 dimensions, written by me (Pietro Battiston) in March 2008 as a university "homework". Here are some [[gvb:screenshots]].
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 It features several calculation, drawing methods and starting positions and the ability to dump frames to png (so that they can be used to build animations). It features several calculation, drawing methods and starting positions and the ability to dump frames to png (so that they can be used to build animations).
  
-It uses scipy for calculations, Gtk (pygtk) and Glade for the user interface and Cairo (pycairo) for graphics. +It uses scipy for calculations, Gtk (pygi) and Glade for the user interface and Cairo for graphics.
- +
  
 Gvb development is substantially finished, so don't expect big "spontaneous" improvements. However, in the remote case someone is interested in some particular feature (for example from the wishlist), I //could// actually implement it, and if someone spots a bug I will //probably// fix it, so feedback is welcome: me [at] pietrobattiston [dot] it. Gvb development is substantially finished, so don't expect big "spontaneous" improvements. However, in the remote case someone is interested in some particular feature (for example from the wishlist), I //could// actually implement it, and if someone spots a bug I will //probably// fix it, so feedback is welcome: me [at] pietrobattiston [dot] it.
  
  
-==== Where can I get GVB? ====+==== Where can I get it? ====
  
-On Launchpad.+You can always find the last version at the address http://pietrobattiston.it/gvb
  
-You can get last GVB release here: https://launchpad.net/gvb/trunk/+//OR// you can get last development GVB with git:
  
-//OR// you can get last development GVB with Bazaar: +   git clone git://pietrobattiston.it/gvb
- +
-   bzr checkout https://launchpad.net/~toobaz/gvb/trunk+
  
 //OR// if you use Debian (at least Lenny) or Ubuntu (at least Intrepid), just install it from the repositories, with synaptic or by giving the command: //OR// if you use Debian (at least Lenny) or Ubuntu (at least Intrepid), just install it from the repositories, with synaptic or by giving the command:
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   * **But Python is slow and GVB needs a lot of calculation!**   * **But Python is slow and GVB needs a lot of calculation!**
-GVB relies on scipy for the calculation, and scipy relies on Lapack and Blas, and Lapack and Blas **aren't** slow (and they are compiled C or Fortran, not Python). So don't worry. If GVB is slow, it's because the calculations to do //really// are hard (or eventually because I did a mistake). To spot the difference between "Python code" and "Python relying on scipy", see the performance improvements between "naif" (pure Python) and "matrix naif" (scipy) methods.+GVB relies on scipy for the calculation, and scipy relies on Lapack and Blas, and Lapack and Blas **aren't** slow (and they are compiled C or Fortran, not Python). So don't worry. If GVB is slow, it's because the calculations to do //really// are hard (or eventually because I did a mistake). To spot the difference between "Python code" and "Python relying on scipy", see the performance improvements between "naif" (pure Python) and "matrix" (scipy) methods.
  
   * **I need a start position not provided / I need a rectangular (non square) grid / I need to set start speeds, not only positions.**   * **I need a start position not provided / I need a rectangular (non square) grid / I need to set start speeds, not only positions.**
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   * **I dumped a lot of png frames. How do I create a movie with them?**   * **I dumped a lot of png frames. How do I create a movie with them?**
-If you have ffmpeg installed, move to the directory where the pngs are and (supposing there are only //those// png) give the following command: +If you have avconv installed, move to the directory where the pngs are and (supposing there are only //those// png) give the following command: 
-  ffmpeg -i %08d.png video.mp4+  avconv -i %08d.png video.mp4
  
  
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 Gueic is totally **GPLv3** Gueic is totally **GPLv3**
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   - The ability to apply masks (select a set of points in the 2D grid that are fixed) would allow observation of interesting (and, for example, more regular) vibrations.   - The ability to apply masks (select a set of points in the 2D grid that are fixed) would allow observation of interesting (and, for example, more regular) vibrations.
   - The possibility to highlight nodes (points that do not move) would be nice.   - The possibility to highlight nodes (points that do not move) would be nice.
-  - Some dampering could be allowed+  - Some dampening could be allowed
   - Elasticity and mass could vary from point to point   - Elasticity and mass could vary from point to point
   - At the moment, the editor allows the creation of nearly every conceivable 1D start position. Instead, something better could be implemented to create 2D start positions.   - At the moment, the editor allows the creation of nearly every conceivable 1D start position. Instead, something better could be implemented to create 2D start positions.
   - There should be the possibility to set rectangular (non square) grids.   - There should be the possibility to set rectangular (non square) grids.
   - Creation of start position and drawings could be optimized a lot.   - Creation of start position and drawings could be optimized a lot.
-  - When dumping to png, plotting to screen should still be enabled.+  - <del>When dumping to png, plotting to screen should still be enabled.</del>
   - The ability to output a .wav file to make you //hear// the vibration of a given point would be nice.   - The ability to output a .wav file to make you //hear// the vibration of a given point would be nice.
   - In the "eig" method, the operator matrix is very sparse. This could make the process of calculating its eigenvalues and eigenvectors much faster, but I'm not really sure and scipy released version still doesn't implement anything useful (as of March 2008)   - In the "eig" method, the operator matrix is very sparse. This could make the process of calculating its eigenvalues and eigenvectors much faster, but I'm not really sure and scipy released version still doesn't implement anything useful (as of March 2008)
gvb.1287864034.txt.gz · Ultima modifica: (modifica esterna)