Statistics + IRB. This offers a series of useful tools that a console should probably have, if your goal is to crunch a few numbers. It includes all the packages that I use, if you have them. Statisticus will have a standard library of statistical methods that you may want to have access to, so it’s probably worth loading that gem as well.
Sirb has a set of rather useful functions setup:
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max
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min
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sum
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mean
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median
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range
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variance (also var)
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standard_deviation (also std)
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sort
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rank
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order
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quantile
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cumulative_sum (also cum_sum)
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cumulative_product (also cum_prod)
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cumulative_max (also cum_max)
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cumulative_min (also cum_min)
For comparing lists, you can use:
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correlation (also cor)
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p_max
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p_min
For other things, you can use:
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max
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min
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product
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to_pairs
Right now, Sirb attempts to load the following libraries (when available):
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NArray
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RGL
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matrix
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set
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RNum
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Statisticus
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RBTree
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mathn
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This library
As you work, you can choose to store a procedure and use it between sessions. I do this with pstore (part of Ruby’s standard library) and some code I found on Ruby Quiz by Florian Groß. The storage process is a little draconian, so in the short-term, you can call sirb with -w (sirb -w) and this feature is taken away from the runtime.
This is a very useful tool to have if you have some R code that you tend to use often, say, or some other functions that you discover while working with some data.
From command line:
sirb
>> @a = [3,2,6,7,14]
=> [3, 2, 6, 7, 14]
>> @b = [4,6,2,1,19]
=> [4, 6, 2, 1, 19]
>> @a.max
=> 14
>> @a.min
=> 2
>> @a.sum
=> 32.0
>> # Most methods have meaningful block semantics
?> @a.sum {|x| x ** x}
=> 1.11120068264282e+16
>> @a.mean
=> 6.4
>> @a.median
=> 6
>> @a.range
=> [2, 14]
>> @a.var
=> 22.3
>> @a.std
=> 4.72228758124704
>> @a.sort
=> [2, 3, 6, 7, 14]
>> @a.rank
=> [2, 1, 3, 4, 5]
>> @a.order
=> [2, 1, 3, 4, 5]
>> @a.quantile
=> [2, 3, 6, 7, 14]
>> @a.cum_sum
=> [3.0, 5.0, 11.0, 18.0, 32.0]
>> @a.cum_prod
=> [3.0, 6.0, 36.0, 252.0, 3528.0]
>> @a.cum_max
=> [3, 3, 6, 7, 14]
>> @a.cum_min
=> [3, 2, 2, 2, 2]
>> # And some methods between lists
?> cor(@a,@b)
=> 0.755599551729267
>> # This is the max of each pair (or set)
?> p_max(@a,@b)
=> [4, 6, 6, 7, 19]
>> # These take an arbitrary sized list
?> p_max(@a,@b, [1,2,3,4,5])
=> [4, 6, 6, 7, 19]
>> # And the min
?> p_min(@a,@b)
=> [3, 2, 2, 1, 14]
>> p_min(@a,@b, [1,2,3,4,5])
=> [1, 2, 2, 1, 5]
>> # Finally, some methods out in the wild for general use:
?> max(1,2,3,4,5)
=> 5
>> min(1,2,3,4,5)
=> 1
>> product(1,2,3,4,5)
=> 120.0
>> to_pairs(@a,@b) { |a, b| a * b }
=> [12, 12, 12, 7, 266]
>> sum_pairs(@a,@b) { |a, b| a * b }
=> 309.0
[sirb]$: bin/sirb
Loading sirb (Statistics + Irb: 0.6.3)
>> set :add, lambda {|x,y| x + y}, "This is my general-use adder, that adds a set of numbers"
=> "add added"
>> add 1, 2, 3
=> 6
>> sirb_help :add
* add (takes 2 arguments, returns a single value--reduce function)
This is my general-use adder, that adds a set of numbers
Source: |x,y| x + y
=> nil
>> sirb_help
This is Irb, with some extra libraries and commands loaded.
You have loaded the following libraries:
narray
rgl
matrix
rnum
set
statisticus
rbtree
rubygems
command runner
enumerable statistics
general statistics
mathn
You have setup the following commands:
* add (takes 2 arguments, returns a single value--reduce function)
This is my general-use adder, that adds a set of numbers
Source: |x,y| x + y
You can store a command like this:
set :command_name, lambda{|list params| command }, "Optional description"
>> commands
=> [:add]
>> remove_command :add
=> #<Sirb::Runner:0x23df728 @block=proc {|x,y| x + y}, @name="add", @description="This is my general-use adder, that adds a set of numbers">
>> commands
=> []
Sometimes it is useful to have a bit of functional flair when implementing equations. I’ve slurped up a bit of that and included it:
.... Fill these in
I’m generally dissatisfied with quantile, which I think matches the way that R does their quantile. However, R is inconsistent, and the community has inconsistent interpretations of how to handle that, so I just used R as the standard for today.
I only mix this into Array right now. I need to work through the various other classes that I use, and see if this will mix into all of those: Vector, Matrix, Hash, RBTree, etc.
I am a little uncomfortable with my stored procedures library. I want to review it, because it so aggressively walk on Proc. There are other ideas out there that I will want to review when I get the chance.
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All the libraries are optional, but every time you log in, you will get a list of libraries that you may want to install.
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sudo gem install davidrichards-sirb
(The MIT License)
Copyright © 2009 David Richards
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