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Get a pixel from HTML Canvas?
....getContext('2d');
// Get the CanvasPixelArray from the given coordinates and dimensions.
var imgd = context.getImageData(x, y, width, height);
var pix = imgd.data;
// Loop over each pixel and invert the color.
for (var i = 0, n = pix.length; i < n; i += 4) {
pix[i ] = 255 - pix[i ]; // r...
Stack smashing detected
...elated errors, but like a debugger, it may help you pin-point the location and reason for the crash.
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How to prevent a background process from being stopped after closing SSH client in Linux
...ought I could do that by starting the process in background (with an ampersand at the end of the command) and redirecting stdout to a file.
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Delete all data in SQL Server database
...e all records from all tables of my database? Can I do it with one SQL command or I need for one SQL command per one table?
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How to find the size of localStorage
...ript stores as UTF-16 (occupies 2 bytes)
P.P.S. Should work both in Chrome and Firefox.
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Regular expression for a hexadecimal number?
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@NiklasB. Your shorthand is only valid if using perl regex, if using POSIX regex, then Steven's solution is the shortest. Either way, Steven's solution works for both perl and POSIX regex.
– David M. Syzdek
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How to use git bisect?
...les saying that git bisect is awesome. However, I'm not a native speaker and I can't understand why it's awesome.
6 Answe...
surface plots in matplotlib
...ing projection='3d' in add_subplot
import matplotlib.pyplot as plt
import random
def fun(x, y):
return x**2 + y
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
x = y = np.arange(-3.0, 3.0, 0.05)
X, Y = np.meshgrid(x, y)
zs = np.array(fun(np.ravel(X), np.ravel(Y)))
Z = zs.reshape(...
Do try/catch blocks hurt performance when exceptions are not thrown?
...mployee we came across a large section of code inside a try{} block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only important sections should be checked. The Micr...
How to sum a variable by group
...umns. First column contains categories such as "First", "Second", "Third", and the second column has numbers that represent the number of times I saw the specific groups from "Category".
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