The Frustrating Magical Aspect

That’s a pretty neat library! Since you seem to know your way around the graphical libraries in Ruby, are there any pure-Ruby libraries you recommend for generating pretty graphs of data?

I liked your post on Processing but don’t have the time to get cracking with JRuby at the moment.

Anything else than sudo gem install xrvg i need to get ‘require “xrvg”’ to work in irb? O_o

This could be useful for prototyping crop circles.

Seb: Well, if we can get the gem to work, you could use XRVG to create graphs. It generates an SVG file, which is just an image format.

But, since I imagine you’re asking for business purposes, I think a lot of people use libraries like Gruff or Scruffy or RMagick, all of which generate the good old formats for the web. PNG and JPEG .

magiker: Sure enough, I can’t seem to find a version that works either. ﾐ◎_◎彡,,/)

I get LoadError: no such file to load — attributable when I try to use it after installing the gem.

@magiker do you get “LoadError: no such file to load — attributable” like I do?

After a bit of detective work, it turns out attributable.rb was last seen in xrvg-0.0.3. I don’t know how it got removed from later versions, but it’s in there. I made a pastie of it so you can print it out and show to your grandma: http://pastie.org/331502

At least that’s what I’m doing with my print copy.

I get the attributable error like those above.

I downloaded and unpacked several old version of the library and attributable.rb was still not present.. so I went back all the way to 0.1 and it’s in there. I’ve put it up at http://pastie.org/331530

I added that to the latest version of xrvg and.. then I get a different error:

uninitialized constant XRVG ::Samplable (NameError)

..

This is just a experimental beta – hold out until the developer releases a version that works :)

I guess this shows the value of refreshing before posting. seydar’s approach and mine match – although it still doesn’t work for me :)

@_why: yeah, the gem not working is kind of a deal-breaker at the moment. :P

And you’re right, I was asking on a business note, but they like pretty graphics where I work, so I thought it was worth asking. Thank you for the links!

WOW !

At first I didn’t really get all the nodebox/processing/fractal enthusiasm on here, but it is definitely growing on me.

I’m also getting the attributable error and then the uninitialized constant XRVG ::Samplable after install the suggested pastie. Think I’ll drop a bug in Rubyforge about it.

Hello everyone, I’m afraid I am the author of the XRVG library :-)
First my apologizes about problems encountered with the XRVG gem, I actually didn’t test gem building and installation carefully (mainly because I prefer drawing something than making an install :-(.
Second, I am very pleased to notice interest here, so I will try to release a next version usable very soon so that you may play with it for the WE.
Last, thanks a lot “why” for your article.

Awesome, thanks Julien! I’m really looking forward to checking this out.

I’ve got the gem working after some help from Julien:

http://rubyforge.org/tracker/?func=detail&atid=20126&aid=23113&group_id=5206

Add the attached attributable.rb to the xrvg gem lib directory, then add:

require ‘forwardable’

to lib/spiral.rb

Works for me.

I installed the gem, followed those instructions, but..

“LoadError: no such file to load — xrvg”

Anyone?

now the gem works perfectly and I’m already in love with it.
Checking the implementation details and I definitely like the work done on ranges.

off to fractalize some reality now!

As Onigiri wrote it (by the way, thanks a lot for your message), XRVG gem must be usable now (I added attribute.rb, and remove (for the moment) dependancy on Forwardable). Note however that the example in README is broken :-(: you must add a “include XRVG ” line after “require”, as XRVG had been packed in a namespace.
If you “read” through fractalyze blog, you may have noticed that for the last six months, I actually rewrote XRVG into C++ (CVG), to gain efficiency. As a consequence, XRVG developpment has been frozen since :-(.
Anyway, I hope XRVG would be useful whatever your purpose, and be sure to check tutorials page (http://xrvg.rubyforge.org/XRVGTutorials.html) to ease your learning curve. Wish you a nice hacking :-)

This was probably obvious to you guys, but it didn’t work for me until I added: include 'rubygems', which is not included the sample or tutorial files.

“on making it work …”, well, no, it is absolutely not obvious to me but weird that you need to include rubygems to use XRVG . I cannot write about XRVG gem (as I us e code straightforward instead of gem), but for other gems I downloaded, I never needed to do such a thing. Furthermore, Onigiri did not seem to have problem … Maybe something wrong with your ruby install ? Anyone else got this problem, and solved it ?

on making it work…: A lot of people have the RUBYOPT environment variable set so that RubyGems is automatically loaded. See the end of this page.

http://lolinator.com/lol/hackety.org/2008/12/04/theFrustratingMagicalAspect.html

Because lolcats are coming back in a big way.

Thank you Julien and Why: this post sparked an idea for unstructured grid generation as used in Computational Fluid Dynamics. I’ll be sure to pass along results if the idea pans out. Thanks again!

Bil
Be sure to share your progress, I am very interested in (once I used to do a lot of fluid mechanic, but I switched to softdev :-).

It seems that my idea has already been developed—see Bubble Meshing and the man behind it, Kenji Shimada.