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sed or awk: delete n lines following a pattern
... A clever (albeit GNU-Sed-specific) solution, but few people will benefit from it, unless you add an explanation. pattern_number.txt is a 2-column file containing the pattern to match in the 1st column, and in the 2nd the number of lines to skip. The first sed command transforms the file into a se...
The tilde operator in Python
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It is a unary operator (taking a single argument) that is borrowed from C, where all data types are just different ways of interpreting bytes. It is the "invert" or "complement" operation, in which all the bits of the input data are reversed.
In Python, for integers, the bits of the twos-c...
How to try convert a string to a Guid [duplicate]
...er something by Guid (since its primary key in a table) what will you send from the front in a request? Most likely a string in URL, but on back in the controller you would most like wanna use it as Guid. As for speed comparison: stackoverflow.com/questions/713109/…
– DanteTh...
The way to check a HDFS directory's size?
...iles. Without the -s option, the calculation is done by going 1-level deep from the given path.
The -h option will format file sizes in a human-readable fashion (e.g 64.0m instead of 67108864)
The -v option will display the names of columns as a header line.
The -x option will exclude snapshots from...
Why does changing 0.1f to 0 slow down performance by 10x?
...amplitude (not audible) DC or or square wave signal to jitter numbers away from denormality.
– Russell Borogove
Feb 17 '12 at 0:12
16
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HTML5 Pre-resize images before uploading
...rough most of the process. For reference here's the assembled source code from the blog post:
// from an input element
var filesToUpload = input.files;
var file = filesToUpload[0];
var img = document.createElement("img");
var reader = new FileReader();
reader.onload = function(e) {img.src = e.t...
How to normalize an array in NumPy?
...kit-learn you can use sklearn.preprocessing.normalize:
import numpy as np
from sklearn.preprocessing import normalize
x = np.random.rand(1000)*10
norm1 = x / np.linalg.norm(x)
norm2 = normalize(x[:,np.newaxis], axis=0).ravel()
print np.all(norm1 == norm2)
# True
...
Removing elements by class name?
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Brett - are you aware that getElementyByClassName support from IE 5.5 to 8 is not there according to quirksmode?. You would be better off following this pattern if you care about cross-browser compatibility:
Get container element by ID.
Get needed child elements by tag name.
Itera...
Coloring white space in git-diff's output
...r.diff or color.ui set to auto since you say that you see coloured patches from git diff anyway.)
If you want to fine tune the type of whitespace errors that are highlighted in red, you can then change core.whitespace, but blank-at-eol is enabled by default so you probably won't need to change that...
How to convert Set to Array?
...ndeed, there are several ways to convert a Set to an Array:
using Array.from
let array = Array.from(mySet);
Simply spreading the Set out in an array
let array = [...mySet];
The old fashion way, iterating and pushing to a new array (Sets do have forEach)
let array = [];
mySet.forEach(v =>...