cpatdowling’s gists

cpatdowling / blockface_geo_distance_example.py

Created February 15, 2022 01:15

This is an example of using sklearn's haversine distance to compute pairwise distances between lat-long pairs. This is then used to find locations or in this instance blockfaces at incremental distances away from each known location

	### compute pairwise distnances

	from sklearn.metrics.pairwise import haversine_distances
	import numpy as np

	#here we make up a bunch of random coordinates
	lats = np.random.uniform(45,47,size=(100,))
	longs = np.random.uniform(-120,-100,size=(100,))
	coords = list(zip(lats, longs))

cpatdowling / linear_transition_kernel.py

Last active April 27, 2021 00:50

A linear transition kernel akin to continuous voting for a multi-agent MDP

	import numpy as np

	def return_linear_pdf(n):
	#n is the number of dimensions/players in the joint action
	#this describes a n-dimensional linear surface defined from [0,1] that integrates to 1
	P = lambda x: (2.0/float(n))*np.sum(x)
	return(P)

	def return_linear_cdf(n):
	#cummulative distribution function for linear PDF

cpatdowling / date_to_feature.py

Last active May 26, 2022 20:34

This (inefficient) function accepts a python datetime and shows how to transform repeating features (day of the year, weekday, hour) on the numberline into continuous features, (ie days 1 and 365 are topologically close to one another at the top of a circle)

	from datetime import datetime as dt
	import calendar
	import numpy as np

	def num_to_circle(z):
	#this functions accepts a number between 0 and 1 and projects it onto x, y coordinates on the unit circle
	x = np.cos(2np.piz)
	y = np.sin(2np.piz)
	return((x, y))

cpatdowling / dynamic_function_generation_for_tkinter_buttons.py

Last active October 21, 2020 21:03

An abuse of python globals() method to dynamically generate sequentially named functions; this was used to automatically populate buttons in a passive, same-thread GUI using tkinter

	#credit to StackOverflow user yann-vernier for means of abuse of globals()
	#https://stackoverflow.com/questions/49631178/using-for-loop-to-define-multiple-functions-python

	import time
	import tkinter as tk
	from types import FunctionType
	from copy import copy

	#The GUI will print filenames and some filename feature when button presses are passively detected

cpatdowling / tkinter_while_loop_switch.py

Last active October 20, 2020 18:49

Basic structure for a switch condition triggered by a GUI button, designed to change variable values within a while loop performing some set of instructions without the need for a dedicated tkinter window thread at the cost of strict concurrency of action

	import tkinter as tk

	flag = False # Global flag
	idx = 0 # loop index

	def switch():
	"""Enable scanning by setting the global flag to True."""
	global flag
	flag = True

cpatdowling / jupyter_header.txt

Last active November 6, 2020 20:00

Personal header for Jupyter Notebooks:

	#cells will fill entire width of the browser
	from IPython.display import display, HTML

	display(HTML(data="""
	<style>
	div#notebook-container { width: 95%; }
	div#menubar-container { width: 65%; }
	div#maintoolbar-container { width: 99%; }
	</style>
	"""))

cpatdowling / help_for_sean.py

Last active October 14, 2018 01:12

Demonstrating a global reference variable in action for a friend

	import copy
	import random

	global market_ref
	market_ref = {'item_1': 100.0,
	'item_2': 200.0,
	'item_3': 100.0}

	def market_shift():
	#updates the global market baseline

cpatdowling / matlab_to_np_txt_array.py

Created May 17, 2017 22:50

Read a Matlab text array into NumPy array

	def read_matlab_float(strin):
	strin = strin.strip()
	tokens = strin.split("e")
	sign_ = tokens[1][0]
	if sign_ == "-":
	sign = -1.0
	else:
	sign = 1.0
	p = float(tokens[1][1:].strip())
	mant = float(tokens[0])

cpatdowling / send_notif_email.py

Last active June 23, 2017 23:30

Python 2.7+ class for sending failure notifications via gmail to oneself; can be nice emails too, I'm not your boss.

	#Requires google application password generation if using 2-factor authentication
	#https://support.google.com/accounts/answer/185833?hl=en

	#Update credential storage method in __init__ method

	#Example usage:
	"""
	from send_notif_email import *

	try:

cpatdowling / mapoverlay.py

Created April 5, 2017 20:16

A native python 2.7+ class that projects WSG84 latitude/longitude coordinates to pixel positions in a Web Mercator map image with known coordination.

	#Example usage
	"""
	upleft = [47.6197793,-122.3592749] Upper left coordinate of map image
	bttmright = [47.607274, -122.334786] Lower right coordinate of map image
	imgsize = [1135,864] Pixel size of map image

	mp = MapOverlay(upleft, bttmright, imgsize)

	#then given a list of latitude/longitude pairs , we can get their relative positions on the image of the map, note
	#that image pixel positions start with (0,0) at the top left of the image, so plotting will require inverting the y-axis

Chase Dowling cpatdowling