Jason Sundram jsundram
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| int step(int curr, int steps, const int n) | |
| { | |
| curr += steps; | |
| if (curr < n) | |
| return step(curr, 1, n) + step(curr, 2, n); | |
| if (curr == n) | |
| return 1; | |
| return 0; | |
| } |
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| // Here's what the linked list looks like. | |
| // I've assumed int values, so you can see that it works | |
| class Node | |
| { | |
| public: | |
| Node() : next(NULL), value(0) {} | |
| Node(int v) : next(NULL), value(v){} | |
| Node* next; | |
| int value; | |
| }; |
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| class Node | |
| { | |
| public: | |
| Node() : next(NULL), value(0) {} | |
| Node(int v) : next(NULL), value(v){} | |
| Node* next; | |
| int value; | |
| }; | |
| bool detect_loop(Node* head) |
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| float root(float n, float epsilon=.000001f) | |
| { | |
| if (n <= 0.0f) | |
| return 0.0f; | |
| float guess = n/2.1f; | |
| float error = n - guess*guess; | |
| while (epsilon < fabs(error)) | |
| { | |
| guess += error / 2; |
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| bool find(int* a, int n, int i) | |
| { | |
| int lo = 0; | |
| int hi = n-1; | |
| while (lo <= hi) | |
| { | |
| int mid = a[(hi + lo) / 2]; // TODO: Overflow | |
| printf("lo: %d, mid: %d, hi: %d\n", lo, mid, hi); | |
| if (mid == i) | |
| return true; |
jsundram
/ haversine.py
Created
April 14, 2011 17:38
simple haversine implementation from description on wikipedia
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| from math import pi, sin, cos, atan2, sqrt | |
| def haversine_distance(loc1, loc2): | |
| """Haversine formula - give coordinates as (lat_decimal, lon_decimal) tuples. Returns distance in miles""" | |
| earth_radius = 6371.0 # km | |
| to_radians = lambda x : x * pi / 180.0 | |
| lat1, lon1 = map(to_radians, loc1) | |
| lat2, lon2 = map(to_radians, loc2) |
jsundram
/ to_wordle.py
Created
May 3, 2011 17:08
Convert a hadoop output file to a format suitable for use by Wordle.net
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| import sys | |
| def to_wordle(s): | |
| f = open(s) | |
| g = open('wordle.txt', 'w') | |
| for line in f: | |
| token, count = line.strip().split('\t') | |
| g.write('%s: %s\n' % (token, count)) | |
| f.close() | |
| g.close() |
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| from matplotlib.colors import hex2color | |
| # color schemes Courtesy of the excellent mbostock's D3.js project | |
| d3_10 = ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd', '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf'] | |
| d3_20 = ['#1f77b4', '#aec7e8', '#ff7f0e', '#ffbb78', '#2ca02c', '#98df8a', '#d62728', '#ff9896', '#9467bd', '#c5b0d5', '#8c564b', '#c49c94', '#e377c2', '#f7b6d2', '#7f7f7f', '#c7c7c7', '#bcbd22', '#dbdb8d', '#17becf', '#9edae5'] | |
| d3_20b = ['#393b79', '#5254a3', '#6b6ecf', '#9c9ede', '#637939', '#8ca252', '#b5cf6b', '#cedb9c', '#8c6d31', '#bd9e39', '#e7ba52', '#e7cb94', '#843c39', '#ad494a', '#d6616b', '#e7969c', '#7b4173', '#a55194', '#ce6dbd', '#de9ed6'] | |
| d3_20c = ['#3182bd', '#6baed6', '#9ecae1', '#c6dbef', '#e6550d', '#fd8d3c', '#fdae6b', '#fdd0a2', '#31a354', '#74c476', '#a1d99b', '#c7e9c0', '#756bb1', '#9e9ac8', '#bcbddc', '#dadaeb', '#636363', '#969696', '#bdbdbd', '#d9d9d9'] |
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| # from http://en.wikipedia.org/wiki/Category:Shades_of_blue | |
| blues = {'Air Force': '#5D8AA8', | |
| 'Alice': '#F0F8FF', | |
| 'Ao': '#0000BB', | |
| 'Azure': '#007FFF', | |
| 'Baby': '#89CFF0', | |
| 'Bleu de France': '#318CE7', | |
| 'Blue': '#0000FF', | |
| 'Bondi': '#0095B6', | |
| 'Brandeis': '#0070FF', |
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| # http://en.wikipedia.org/wiki/Extreme_points_of_the_United_States#Westernmost | |
| top = 49.3457868 # north lat | |
| left = -124.7844079 # west long | |
| right = -66.9513812 # east long | |
| bottom = 24.7433195 # south lat | |
| def cull(latlngs): | |
| """ Accepts a list of lat/lng tuples. | |
| returns the list of tuples that are within the bounding box for the US. | |
| NB. THESE ARE NOT NECESSARILY WITHIN THE US BORDERS! |
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