With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.
– John von Neumann
With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.
– John von Neumann
“There are nine and sixty ways of constructing tribal lays, and every one of them is right.”
– Richard Kipling
Used in:
“All happy families are alike; each unhappy family is unhappy in its own way.”
– Leo Tolstoy in Anna Karenina
Anna Karenina on Project Gutenberg
I think, therefore I am.
– René Descartes
Used in:
Chuck Severance, clinical professor at the University of Michigan’s School of Information, recently published a new textbook in 11 days because he was able to remix an existing textbook. The book, Python for Informatics: Exploring Information, is currently being used in his winter semester Networked Computing course. The textbook is based on the openly licensed book Think Python: How to Think like a Computer Scientist by Allen B. Downey. Students are able to take advantage of the University Library’s Espresso Book Machine to print on-demand copies for approximately $10. Python for Informatics is available under a CC BY-SA license.
Severance explains, “the book is a cool example of a situation where I’ve finally got to the ‘remixing’ bit of the Open promise.” The first 10 chapters are done and eight more are planned for completion by April 2010. Read more of Chuck’s thoughts about remixing an open book.
Creating this open textbook was a part of a larger effort by Chuck to support his course with openly licensed content, and current versions of lecture slides and videos are published via the PythonLearn website. In a past iteration of the course, Chuck went through the dScribe process developed by Open.Michigan to create an OER version of SI 502, available under a CC BY license.
Civilization advances by extending the number of important operations which we can perform without thinking about them.
– Alfred North Whitehead from An Introduction to Mathematics (1911) Chapter 5
Quoted in:
The grand aim of all science is to cover the greatest number of empirical facts by logical deduction from the smallest number of hypotheses or axioms.
– Albert Einstein
Quoted in:
GitHub
Hacker News
Medium
Blogs
% Load and display an image
img = imread(‘filename.jpg’)
imshow(img)
% Image size
disp(size(img));
% Image class (data type):
disp(class(img));
% At a given location (row, col):
disp(img(50, 100));
% For an entire row:
disp(img(50, :));
plot(img(50, :));
% A slice of an image
img(101:103, 201:203))
% Crop an image
cropped = img(110:310, 10:160)
Note: Matlab indexes begin at 1 not 0
% Get the red layer (RGB)
img_red = img(:, :, 1);
% Get the green layer (RGB)
img_green = img(:, :, 2);
% Get the blue layer (RGB)
img_blue = img(:, :, 3);
% Add two images
summed = img_1 + img_2
% Average of two images
average = img_1 / 2 + img_2 / 2
% Multiply by a scalar
0.5 * img
% Blend two images
result = 0.75 * img_1 + 0.25 * img_2
% Image difference
diff = img_1 – img_2
diff = img_2 – img_1
% Absolute image difference
imabsdiff(img_1, img_2)
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