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count_by = function(collection,field) { | |
return collection.aggregate({ | |
$group: { | |
_id: "$" + field, | |
count: { $sum: 1 } | |
} | |
}) | |
} | |
count_by(db.vid10,'char'); |
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[alias] | |
lgb = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset%n' --abbrev-commit --date=relative --branches |
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function add_rand_field(collection) { | |
collection.find().forEach(function(data) { | |
collection.update({_id:data._id}, { | |
$set:{rand:Math.random()} | |
}); | |
}); | |
collection.ensureIndex({rand:1},{background:true}) | |
} |
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import copy | |
import math | |
import logging | |
def balance_cnt(n): | |
"""Considering all nxn matrices consisting entirely of 0s and 1s, | |
return the number of matrices which have exactly n/2 ones in each column and each row. | |
Solution using dynamic programming as outlined here: | |
https://en.wikipedia.org/wiki/Dynamic_programming#A_type_of_balanced_0.E2.80.931_matrix | |
Produces answers in this sequence (for n/2) https://oeis.org/A058527 |
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# | |
# Cookbook Name:: imgmuck | |
# Recipe:: default | |
# | |
# Copyright 2012, Scaled Recognition, all rights reserved | |
# | |
include_recipe "git" | |
include_recipe "python" | |
include_recipe "application" |
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set -o vi # Switch bash to vi mode |
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