I'm having trouble setting legend labels with either add or add_with_df. I just get 'scatter' or 'line' for each one. Is there an example somewhere?

Using time series values for X or Y axes would be very beneficial.

Here's an example:

@agarie @pjotrp @MohawkJohn

From my knowledge of nyaplot, currently to add a new diagram (scatter, line, etc.) to the same plot from a DataFrame, user needs to use the Plot#add_with_df function every time. From the surface I think the DataFrame is being duplicated every time.

It would be great if it would be possible to configure the add_with_df method such that the diagram types and their corresponding X and Y axis columns could be specified in one shot.

Or maybe some sort of a DSL which lets you configure these options in a block, so that the corresponding Nyaplot::Diagram objects can also be configured.

Currently line graphs use solid lines only. Being able to specify the type of line would be a great add-on.

For example dashes - - - or dots . . . or even asterisk * * *.

I'm having trouble with some longer plot labels being cut off. Below is an example. Is there some way to set margins around the plot?

Thanks for any guidance you can provide.

When using large values in one of the axis, the label is positioned in this way:

Matplotlib rewrites the ticks in scientific notation when they are very large or small (e.g. 1e7) and appears to adjust the label position when the values aren't so large. I only did some quick tests, though.

This would be really useful for quickly preparing plots. Of course I can fix them manually, but having some heuristics in place can be very useful.

This is in the code, but there should be a list of available shapes (the s in scatterplot.shape(s)) for scatterplots.

 $ ruby lib/correlation.rb 
/Users/tansaku/.rvm/gems/ruby-2.2.3/gems/iruby-0.2.7/lib/iruby/utils.rb:8:in `display': undefined method `session' for nil:NilClass (NoMethodError)
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/core.rb:45:in `init_iruby'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/core.rb:48:in `<module:Nyaplot>'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/core.rb:3:in `<top (required)>'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot.rb:4:in `require_relative'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot.rb:4:in `<top (required)>'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `rescue in require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:39:in `require'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/daru-0.1.1/lib/daru.rb:45:in `block in create_has_library'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/daru-0.1.1/lib/daru/plotting/vector.rb:39:in `<top (required)>'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/daru-0.1.1/lib/daru/vector.rb:5:in `<top (required)>'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/daru-0.1.1/lib/daru.rb:70:in `<top (required)>'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample.rb:25:in `<top (required)>'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `rescue in require'
    from /Users/tansaku/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:39:in `require'
    from lib/correlation.rb:2:in `<main>'

first two lines of the file:

``ruby
require 'iruby'
require 'statsample'

if I remove the nyaplot gem everything runs fine :-(

As far as I can see the x data labels for a boxplot default to 'data0', 'data1' etc. does anyone know how to change that?

http://nbviewer.ipython.org/github/SciRuby/sciruby-notebooks/blob/master/getting_started.ipynb

I think that #tooltips is a more natural name than #tooltip_contents (I've had to go back to the docs 3x to remember the correct name :P). Aliasing it shouldn't be a problem, I guess.

By the way, it accepts only Arrays, right? What do you think about accepting single symbols as well? This isn't a deal-breaker, but I've done this wrong a couple of times:

# data has rows with :x, :y and :name.
plot = Nyaplot::Plot.new
scatter = plot.add_with_df(data, :scatter, :x, :y)
scatter.tooltip_contents :name # oops

As I said, this would be a nice addition, but isn't critical.

Another thing that would be nice is a boolean parameter to select if the attribute's name will be printed or not. For example, if I did the above example correctly (with scatter.tooltip_contents [:name]), the tooltips would be filled with name:etc. This kind of control is very useful.

I was trying to do a 3D plot from a dataframe and realized the internal API is a bit different. Is Diagram3D still in the process of being updated to be similar to the API in Diagram, or will it always be different? Is it possible for me to generate a 3D plot from a dataframe?

Sorry to pester with all of the questions.

Hey Naoki,

I'm a little concerned with the lack of specs in your project. It's tough to tell how things should work when I'm making modifications without any specs — how do I know I haven't broken something?

Is this something you've simply forgotten to push?

cc @pjotrp

John

I do not see any plots by nyaplot on running any of the notebooks locally on my computer. Instead I get this weird output at the top:

(Click here if the image is not visible)

Notebook used: https://github.com/SciRuby/sciruby-notebooks/blob/master/Data%20Analysis/Usage%20of%20Vector.ipynb

I am running Ubuntu. I have tried running on Firefox and Chrome multiple times, the plots aren't visible.

I searched the documentation for some example, but I couldn't find how to generate something similar to the subplots of MATLAB or Matplotlib.

Is it possible right now? If not, this would be really useful.

My object looks like this:

=> #<Nyaplot::DataFrame:0x007fb7f12ce3f8
 @name="fc7a72cc-a5d9-42f2-b138-28aa75741e6c",
 @rows=
  [{:wavelength=>0.2051, :reflectance=>-1.23e+34, :standard_deviation=>0.090781},
   {:wavelength=>0.2131, :reflectance=>-1.23e+34, :standard_deviation=>0.01882},
   {:wavelength=>0.2211, :reflectance=>-1.23e+34, :standard_deviation=>0.005416},
   {:wavelength=>0.2291, :reflectance=>-1.23e+34, :standard_deviation=>0.002928},

If I do x.wavelength, I can get that as a series:

=> #<Nyaplot::Series:0x007fb7f4854b58
 @arr=
  [0.2051,
   0.2131,
   0.2211,
   0.2291,
   0.2361,

But if I do x.each or x.to_a, I get:

=> #<Nyaplot::Series:0x007fb7f4b90380
 @arr=
  [nil,
   nil,
   nil,
   nil,

The function I use to load my data produces a hash of hashes, which is fed directly in:

def read_asc filename
  Nyaplot::DataFrame.new(CSV.open(filename, 'r', col_sep: ' ', headers: [:wavelength, :reflectance, :standard_deviation], converters: :numeric).drop(16).map do |csv_row|
    csv_row.to_h.delete_if { |k,v| k.nil? }
  end)
end

I imagine it has something to do with the use of symbols for headers, but haven't had time to test it more extensively.

Hi

How do I add a label to a scatter plot point? I am doing something like:

plot = Nyaplot::Plot.new
plot.width(400)
plot.height(400)
plot.zoom(true)
points_x = [10,20,30,40]
points_y = [30,20,40,80]
plot.add(:scatter, points_x, points_y)
plot.show

I'd like each point to show something on it (eg: coordinate, name, etc).

Is this possible in the current version?

Nyaplot can only export to HTML currently (at least that's what I found looking at the source/rubydoc).

Being able to export to other formats, e.g. PNG (even if it would mean a static image instead of the cool dynamic plots), would be useful for reports and presentations, which are my use cases.

Hey Naoki,
I think it's good to add some comments on the codes. Specially some comments which describes what's in that particular files and classes stands for. Your variable naming is good. Comments will improve readability.

Hi

I am trying to add this gem to my project via gem install nyaplot and I get:

ERROR: Could not find a valid gem 'nyaplot' (>= 0) in any repository

I'm on Mavericks (Mac OS 10.9.4) with Ruby 2.1.0

Thanks

It would be great if an option for histograms would enable users to plot a normal distribution curve when creating a histogram.

Something like the graph in this example: http://nbviewer.ipython.org/github/SciRuby/sciruby-notebooks/blob/master/Visualization/Creating%20a%20Histogram.ipynb

Here's my use case:

I have a plot whose X co-ordinates exist only at integer co-ordinates (1,2,3,4,5,6), and I want to see the X axis show me only the integers at which the points exist, i.e. 1,2,3,4,5,6.

It so happens that nyaplot also displays in-between decimal numbers (0,0.5,1,1.5,2...). Having the ability to customize the step size between valid X co-ordinates would be great. OR maybe have the ability to display only the integer X co-ordinates.

Here's a picture of how the X axis looks as of now:

When running the examples in iruby. Plot.show in the browser generates the following:

=====>
Javascript error adding output!
TypeError: Cannot read property 'pane' of undefined
See your browser Javascript console for more details.
Out[3]:
["display_data", "<IDS|MSG>", "2921bf49eb70d9bd96b21c38215b195320e4956f4f9497a9bde353574446c444", "{"msg_type":"display_data","msg_id":"d804d835-4cdd-4601-a427-82cfbaff7477","username":"kernel","session":"51465e7f-83a7-46d4-ab54-cf115441e807","version":"5.0"}", "{"username":"username","version":"5.0","msg_id":"8F7E63E9D1A84CEE8B01C38B8F38E97B","msg_t ...
=====>

instead of displaying the plot. I also noticed on the terminal the following messages when I start iruby notebook at the examples folder:

=====>
/usr/local/lib/ruby/gems/2.2.0/gems/nyaplot-0.1.6/examples/notebook $ iruby notebook
Could not load bundler: iruby is missing from Gemfile. This might not work.
Add gem 'iruby' to your Gemfile to fix it.
[I 14:18:02.945 NotebookApp] Serving notebooks from local directory: /usr/local/lib/ruby/gems/2.2.0/gems/nyaplot-0.1.6/examples/notebook
[I 14:18:02.945 NotebookApp] 0 active kernels
[I 14:18:02.945 NotebookApp] The IPython Notebook is running at: http://localhost:8888/
[I 14:18:02.945 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[W 14:18:13.391 NotebookApp] Notebook 3DPlot.ipynb is not trusted
[I 14:18:13.746 NotebookApp] Kernel started: c2a15589-00b2-45a9-a7bc-7400cbcaa81a
W, [2016-02-16T14:18:14.585399 #4832] WARN -- : Could not load bundler: iruby is missing from Gemfile. This might not work.
Add gem 'iruby' to your Gemfile to fix it.
/usr/local/lib/ruby/gems/2.2.0/gems/iruby-0.2.8/lib/iruby/command.rb:108:in check_bundler' /usr/local/lib/ruby/gems/2.2.0/gems/iruby-0.2.8/lib/iruby/command.rb:67:inrun_kernel'
/usr/local/lib/ruby/gems/2.2.0/gems/iruby-0.2.8/lib/iruby/command.rb:34:in run' /usr/local/lib/ruby/gems/2.2.0/gems/iruby-0.2.8/bin/iruby:5:in<top (required)>'
/usr/local/bin/iruby:22:in load' /usr/local/bin/iruby:22:in

hope this helps.

P.S. note that arrows above are added by me for clarity. Thank you.

Currently when I pass a nil in an Array for plotting, nyaplot returns an error.

It would be great if it could handle nils properly by not plotting the points where they appear, like GNU plot.

Here's some example code:

require 'nyaplot'

p = Nyaplot::Plot.new
p.add(:scatter, [10,nil,30], [0,1,2])
p.show
#ArgumentError: comparison of NilClass with 10 failed

moved from #53

Few days ago I filed this issue #65 and it turns out that not even basic examples which do not involve iRuby are working for me. I am using the latest nyaplot gem installed via gem install nyaplot.

This is the example I ran and below is my IRB output:

?> require 'nyaplot'
=> true
>> 
?> # Bar chart
?> plot = Nyaplot::Plot.new
=> #<Nyaplot::Plot:0x0000000320edf8 @properties={:diagrams=>[], :options=>{}}>
>> plot.add(:bar, ['Persian', 'Maine Coon', 'American Shorthair'], [10,20,30])
=> #<Nyaplot::Diagram:0x00000003200c08 @properties={:type=>:bar, :options=>{:x=>"data0", :y=>"data1"}, :data=>"191ab013-5f74-456e-98d0-ed422c72700c"}, @xrange=["Persian", "Maine Coon", "American Shorthair"], @yrange=[0, 30]>
>> plot.x_label("Species")
=> #<Nyaplot::Plot:0x0000000320edf8 @properties={:diagrams=>[#<Nyaplot::Diagram:0x00000003200c08 @properties={:type=>:bar, :options=>{:x=>"data0", :y=>"data1"}, :data=>"191ab013-5f74-456e-98d0-ed422c72700c"}, @xrange=["Persian", "Maine Coon", "American Shorthair"], @yrange=[0, 30]>], :options=>{:x_label=>"Species"}}>
>> plot.y_label("Number")
=> #<Nyaplot::Plot:0x0000000320edf8 @properties={:diagrams=>[#<Nyaplot::Diagram:0x00000003200c08 @properties={:type=>:bar, :options=>{:x=>"data0", :y=>"data1"}, :data=>"191ab013-5f74-456e-98d0-ed422c72700c"}, @xrange=["Persian", "Maine Coon", "American Shorthair"], @yrange=[0, 30]>], :options=>{:x_label=>"Species", :y_label=>"Number"}}>
>> plot.export_html("bar.html")
=> 2245

When I open "bar.html" in Firefox or Chromium I get blank page with "Nyaplot" as title of the page.

Here is the output to "bar.html" file.

Any suggestions?

Hi Naoki,
I tried below to install your gem.
sudo rake nyaplot.gemspec
But it isn't installing the gem. Is this an issue? Am I doing it right?

Hi,
I got an error while trying to run the spec files.
rspec data_spec.rb

This is the error I'm getting:
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in require': cannot load such file -- spec_helper (LoadError) from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:inrequire'
from /home/lahiru/dump/nyaplot/spec/data_spec.rb:1:in <top (required)>' from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:inload'
from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in block in load_spec_files' from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:ineach'
from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in load_spec_files' from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:97:insetup'
from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:85:in run' from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:70:inrun'
from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:38:in invoke' from /var/lib/gems/1.9.1/gems/rspec-core-3.0.3/exe/rspec:4:in<top (required)>'
from /usr/local/bin/rspec:23:in load' from /usr/local/bin/rspec:23:in

I have a very strange issue with empty plots occuring depending on what other dependencies I load into my iRuby notebook session.

If I run this:

In [1]: require 'nyaplot'
Out[1]: true

In [2]: p = Nyaplot::Plot.new
        p.add(:bar, ['a','b','c'], [1,2,3])
        p.show

It works great:

However, if i then require 'mongoid', and try to run that line again, I get an empty plot:

Any help is appreciated! Thanks!

I've tried to do plot.zoom false but it still allows zooming.

I'm doing some boxplots and noticed that the tooltips with mean, max, etc values can hide one another. For example:

Maybe positioning these labels relative to each other instead of based on the values of the distribution could solve this problem. What do you think?

While making some tutorials for using daru as a visualization tool with nyaplot for my GSOC project, I came across quite a few instances where I realized that instead of first converting to nyaplot data types, it would be very convenient if users could simply use daru with nyaplot directly.

For example, scatter plots automatically update themselves when the corresponding data frame is updated, but this can only be done when it's a Nyaplot::DataFrame (or now a Mikon::DataFrame).

I think it will be in the best interests of both daru and nyaplot if we used daru with nyaplot.

Here are more reasons for my conviction:

• Daru will be the primary data library for all the statsample gems (time-series, glm, etc.). Making it simple to pass data between a stats library and nyaplot would make life much much easier for users of both our libraries. Currently I'm almost done with statsample integration and have also written detailed tutorials on using daru (more coming soon).
• Daru will soon support time series, plotting this data properly is very important and nyaplot has the right capabilities for the same.
• Daru supports single and hierarchical indexing and many table operations like join, merge, etc. Also pivot table and sorting when preserving indexing.
• Daru is quite capable of handling 'wild' data. It sports support for statistical analysis with missing data present and has a bunch of methods to deal with missing data. This will only get better with time.
• Burden on time and space will be greatly reduced if inter-conversion between daru and nyaplot data is avoided.
• Daru integrates very well with IRuby notebook.
• There will be a clear focus for Ruby scientific libraries (DataFrame and interactive plotting in this case).

Hey Naoki,

Is there some reason you choose to store the data frame column names as strings instead of symbols? Symbols would be more efficient.

FYI, I'm going to contribute some DataFrame code in a bit, but wondered about this.

John

I create a plot (the one below) and the label names in the X axis aren't distinct. If they could be displayed partially or without overlapping, that would be great.

It would be great if we could see a thin grey line denoting the mean or median in a bar graph or histogram.

Something on the lines of the graphs shown in this blog post:
http://flowingdata.com/2009/09/23/tv-size-over-the-past-8-years/

Hey Naoki,
I checked your specs and I saw there were specs only for 2 classes. It's easy to run and test your code if you add more specs. Again you may add some comments also in specs (maybe after the deadline). It's hard to understand the content of your test files.

I wasn't sure about this, but I think 'process' is what you mean. Proceed can't have a direct object in English. I didn't want to change it without checking.

After installing nyaplot I am seeing

[...]
You can also use nyaplot without IRuby like /path/to/nyaplot/examples/rb
or on your browser:
https://github.com/domitry/nyaplot/tree/master/examples/rb
[...]

What does this mean?

I just cloned this to check out your great work! I noted when trying to cd into the Nyaplot clone I made that it's actual name not following the familiar convention by starting with a capital letter. i.e

$ ls 
Nyaplot/                         method_source-0.8.2/             rdoc-4.1.1/
backports-3.6.0/                 multi_json-1.10.1/               rspec-3.0.0/
codeclimate-test-reporter-0.3.0/ multi_test-0.1.1/                rspec-core-3.0.2/
coderay-1.1.0/                   narray-0.6.0.9/                  rspec-expectations-3.0.2/
colorize-0.7.3/                  nmatrix/                         rspec-longrun-1.0.1/
cucumber-1.3.15/                 nmatrix-0.1.0.rc3/               rspec-mocks-3.0.2/
diff-lcs-1.2.5/                  packable-1.3.6/                  rspec-support-3.0.2/
docile-1.1.5/                    pry-0.10.0/                      sciruby.com/
ffi-1.9.3/                       rake-10.3.2/                     simplecov-0.8.2/
fftw/                            rake-compiler-0.8.3/             simplecov-html-0.8.0/
fftw-0.0.4.rc1/                  rake-compiler-0.9.2/             slop-3.5.0/
fftw3-0.3/                       rake_tasks-2.0.6/
gherkin-2.12.2/                  rb-gsl/

It's probably going to be easier for people to find your gem if you change the name to nyaplot

I've searched the docs and the examples but I can't find a way to implement tooltips for heatmaps.
Most simply, I'd just like to see the numeric value associated with the box.
Thanks

Hi,

I am currently trying to use the nyaplot plot generator for a project that I am working on. I able to successfully instantiate a plot object. I'm also able to successfully call the 'add' method to add a type (:bar), and the x and y array data, however, when I call 'show' I get a NoMethodError: undefined method `session' for nil:NilClass.

I am getting the error because Kernal.instance is nil when 'session' is called via the display method in the utils module.

Now, I am new to plotting using nyaplot so I assumed at first I could be doing something wrong, but I was able to recreate the issue outside my project using the steps shown below. Any help in either getting the issue resolved, suggesting a work around or in pointing me to what I could be doing wrong would be greatly appreciated.

Recreation...

$ irb
2.1.1 :001 > require 'nyaplot'
=> true
2.1.1 :002 > require 'iruby'
=> true
2.1.1 :003 > plot = Nyaplot::Plot.new
=> #<Nyaplot::Plot:0x00000101209c78 @properties={:diagrams=>[], :options=>{}}>
2.1.1 :004 > bar = plot.add(:bar, ['Test1', 'Test2', 'Test3'], [10,20,30])
=> #<Nyaplot::Diagram:0x0000010114a490 @properties={:type=>:bar, :options=>{:x=>"data0", :y=>"data1"}, :data=>"3dff1878-d3f2-4e2e-b132-51fb77c2cb1d"}, @xrange=["Test1", "Test2", "Test3"], @yrange=[0, 30]>
2.1.1 :005 > plot.show
NoMethodError: undefined method `session' for nil:NilClass

Another recreation…

$ irb
2.1.1 :001 > require 'iruby'
=> true
2.1.1 :002 > require 'nyaplot'
NoMethodError: undefined method `session' for nil:NilClass

Line graphs only show the line along which the data exists and are very limiting in nature for things like showing the temperature of a city on each day of the week.

It would be great if line graphs could display the Y co-ordinate values at the vertices. Adding tooltip_contents support like that in scatter plots would also be good.

Heres an example graph of what I'm saying:

array_of_values = [5..10]
plot1 = Nyaplot::Plot.new
b_plots = {}
array_of_values.each_with_index do |values, index|
  b = [0..5].map{|i| i*value}
  b_plots[values] = plot1.add(:line, truncate, b)
  b_plots[values].title("V = #{values}")
end

plot1.x_label("Test #")
plot1.y_label("number of occurrences")
plot1.legend(true)
plot1.bg_color("#FFF")
plot1.legend_options({title: 'test title', font_size: 34.0 })
plot1.export_html('info.html')

legend_options appears to be set correctly but it does not change what is displayed. No title or change in font size.

It seems like box plots only work with nominal data, but I'd like to make a candlestick plot where the independent variable is numeric and not distributed at a regular interval. Is there a way to accomplish this?

This is a very important feature for using Nyaplot in more contexts. Better labels also make graphs more readable.

This should be possible with MathJax, I think.

It'd be super cool if we could use the SQL-like features of ActiveRecord with DataFrame. I haven't given much thought to how this would look, except perhaps df.where(:my_column => 3). I think this could help us to generate some summary-type dataframes quickly. Let's say, for example, that you want the mean of some column, but only where another column is between 0 and 3.

When you rename a project on github you lose all existing issues!