amarvutha’s gists

amarvutha / inverse_transform_probability_distribution.py

Created August 21, 2018 01:05

Fast Python implementation of Inverse Transform Sampling for an arbitrary probability distribution

	import numpy as np
	from numpy.random import random
	from scipy import interpolate
	import matplotlib.pyplot as plt
	import cProfile

	def f(x):
	# does not need to be normalized
	return np.exp(-x*2) np.cos(3x)2 (x-1)*4/np.cosh(1x)

amarvutha / gaussian_beams.ipynb

Created June 14, 2018 20:30

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amarvutha / monitor_and_plot.py

Last active August 29, 2015 14:26

	# Monitor and plot

	from __future__ import division, print_function
	import numpy as np
	from numpy import sin, cos, random
	from scipy.constants import c,e,h,hbar,u,pi
	import matplotlib.pyplot as plt
	import matplotlib.animation as animation
	import time

amarvutha / sine_fitting - known frequency.py

Last active August 29, 2015 14:04

Extraction of a sine wave's parameters (especially phase) with a known frequency. A demonstration of linear least squares.

	# Least squares fitting
	# IEEE algorithm version for known frequency

	from __future__ import division
	import numpy as np
	from numpy import pi
	from numpy import fft
	from numpy import linalg as lg
	import pylab as plt
	import matplotlib.gridspec as gridspec

amarvutha / sine_test.ino

Last active August 29, 2015 14:02

	// Arduino Due simple synthesizer
	// arbitrary waveforms on DAC0
	// using Timer library to run off internal clock

	#include <DueTimer.h>

	int led = 13;
	int sensorPin = A0;
	int triggerPin = 4;
	int outputValue = 0;

amarvutha / characteristicImpedanceTEM.py

Last active August 29, 2015 14:01

Characteristic impedance & field pattern in arbitrary transmission lines

	# Transmission line characteristic impedance
	# Amar, 12 July 2012
	# version 3

	# All lengths in cm, E-fields in V/cm, time in ns
	import pylab as plt
	import numpy as np
	from numpy import pi
	from scipy.weave import blitz
	import cPickle, time

amarvutha / beamCamera.py

Last active August 29, 2015 14:00

Acquiring a webcam image and slicing it, for an atomic beam camera

	# Display webcam image from beamline monitor
	# version 3, 2014-04-25
	# Amar


	import numpy as np
	import cv2
	import matplotlib.animation as animation
	import matplotlib.pyplot as plt
	import matplotlib.cm as cm

amarvutha / oscillatorAnimation.py

Last active August 29, 2015 13:59

Oscillator animation

	# Animation of harmonic oscillator, with Verlet integration

	from __future__ import division
	import numpy as np
	from numpy import sin, cos
	from scipy.constants import c,e,h,hbar,u,pi
	import matplotlib.animation as animation

	delta = 1e-2 # spatial discretization
	x = np.arange(-2,2,delta)

amarvutha / fourier-ellipse.py

Created April 3, 2014 18:51

Animated reconstruction of a random ellipse from fourier coefficients

	# Fourier reconstruction of random ellipse
	# Amar Vutha
	# 2014-04-03

	import pylab as plt
	import numpy as np
	from numpy import pi
	import matplotlib.pyplot as plt
	import matplotlib.animation as animation

amarvutha / rigolScope-spectrumAnalyzer.py

Last active August 29, 2015 13:56

Spectrum analyzer with Rigol scope

	# Get waveforms from Rigol scope and do spectrum analysis, fast version
	# Amar Vutha
	# version 1, 2013-12-30

	from __future__ import division
	import pylab as plt
	import numpy as np
	from scipy import signal
	from scipy.constants import e
	import os