samstewart

% make a grid from [0, 2] x [0, 2]
[x, y] = meshgrid(0:.1:2, 0:.1:2);

% now we construct the vector field
u = -y;
v = x;

% why do they call it quiver?
quiver(x,y,u,v)

samstewart

% The linspace command in matlab has spacing which is strange (x2 - x1)/(n-1). This is incorrect for the Fourier commands. This command fixes the problem.

function x = fourier_linspace(x1, x2, N)
	% we can use the matlab linspace command and just ignore the right endpoint.
	x = linspace(x1, x2, N + 1);
	x = x(1:end - 1);
end

samstewart

% simple script that allows one to plot the Fourier modes.  % The modes should be given in Terry Tao's notation so that
% u = \sum_{i = 1}^N exp(2 \pi n xi) \hat{u}_n
% For example, cos would be given as [0 1/2]
function plot_fourier_modes(K, modes)
	plot(fourier_linspace(0, 2*pi, 2*K + 1), ifft(full_fourier_spectrum(K, modes))); grid on;
end

samstewart

% generate a simple heatmap in matlab
  
colormap('hot');

% randomly generate some noise
data = rand(100, 100);

% plot "image with scaled color".
imagesc(data)

samstewart

% simple command that converts a vector to a multidimensional index given the size of the array
% you should ignore any singleton dimensions (don't provide an element of the vector)
% TODO turn this into a Gist 
% size_of_matrix: vector of dimensions of the matrix (can include singleton dimensions)
% vec_index: a vector whose nth component corresponds to the nth index.  
function indx = vec2ind(size_of_matrix, vec_index)
        % We convert this to a linear index. Not that matlab takes the full n dimensional integer
        % lattice and converts it to a one dimensional integer lattice by reading off successive columns.
        % the formula (really bijection between countable sets) between Z^n_1 x Z^n_2 x Z^n_3 --- Z^n_k is given by 
        % (a_0, a_1, ..., a_n) -> a_0 + (b_0)(a_1 - 1) + (b_0 b_1) (a_2 - 1) + (b_0 b_1 b_2) (a_3 - 1) + ....

samstewart

# A simple makefile for java programs

JCC = javac
LIBS = /usr/bin/apache-commons.jar:/usr/bin/pdfbox.jar

JFLAGS = -g -cp $(LIBS):.

# we clear any default suffixes
.SUFFIXES: .java .class

samstewart

#!/usr/bin/python
# awesome python script that takes all files from the camera and archives them.
# it imports from the temp directory and builds a large archive in the Photo folders.
# The current iteration is quite functional in an effort for conciseness.

import os, time, shutil, calendar, subprocess, sys, fnmatch, shutil, re
from os import path

class PhotoArchiver:

samstewart

# g++ -mmacosx-version-min=10.8 -o bin/kepler kepler.cpp image_compare.cpp s3_conn.cpp report_parser.cpp `GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs` -L 'reference source/jsoncpp-src-0.5.0/libs/linux-gcc-4.2.1' -ljson -I 'reference source/jsoncpp-src-0.5.0/include/json' -L 'reference source/libs3-2.0/build/lib' -I 'reference source/libs3-2.0/inc' -I include -lcurl -lxml2 -lz -ls3 

GMLINKER=`GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs`

IDIR = include
CC = g++
CFLAGS =-I$(IDIR) -mmacosx-version-min=10.8 -Wall -I/usr/local/include/GraphicsMagick -g

ODIR = bin
LDIR =../lib

samstewart

[
	
	{
		"description" : "",
		"elements" : 
		[
			
			{
				"description" : "",

samstewart

(function() {

  var root = (typeof exports == 'undefined' ? window : exports);

  var config = {
    // Ensure Content-Type is an image before trying to load @2x image
    // https://github.com/imulus/retinajs/pull/45)
    check_mime_type: true
  };