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Generating Random Passwords
...
throw new ArgumentNullException("characterSet");
var characterArray = characterSet.Distinct().ToArray();
if (characterArray.Length == 0)
throw new ArgumentException("characterSet must not be empty", "characterSet");
var bytes = new byte[length * 8];
new RNGCryptoSer...
techniques for obscuring sensitive strings in C++
...y with XOR
For instance, you could use XOR to split the key into two byte arrays:
key = key1 XOR key2
If you create key1 with the same byte-length as key you can use (completely) random byte values and then compute key2:
key1[n] = crypto_grade_random_number(0..255)
key2[n] = key[n] XOR key1[n]
...
Xcode stuck on Indexing
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I had this exact problem, it was caused by a 20 item array literal. Had to switch to different syntax. Pretty silly.
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Find element's index in pandas Series
...1,1,2,2,3,4]).get_loc(2)
Out[5]: slice(2, 4, None)
Will return a boolean array if non-contiguous returns
In [6]: Index([1,1,2,1,3,2,4]).get_loc(2)
Out[6]: array([False, False, True, False, False, True, False], dtype=bool)
Uses a hashtable internally, so fast
In [7]: s = Series(randint(0,10,1...
Get a pixel from HTML Canvas?
...cument.getElementById('myCanvas').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) {
...
How to compute the similarity between two text documents?
... elements in Compressed Sparse Row format>
You can convert the sparse array to a NumPy array via .toarray() or .A:
>>> pairwise_similarity.toarray() ...
How to perform element-wise multiplication of two lists?
...e you're already using numpy, it makes sense to store your data in a numpy array rather than a list. Once you do this, you get things like element-wise products for free:
In [1]: import numpy as np
In [2]: a = np.array([1,2,3,4])
In [3]: b = np.array([2,3,4,5])
In [4]: a * b
Out[4]: array([ 2, ...
Converting Stream to String and back…what are we missing?
...e.
string test = "Testing 1-2-3";
// convert string to stream
byte[] byteArray = Encoding.ASCII.GetBytes(test);
MemoryStream stream = new MemoryStream(byteArray);
// convert stream to string
StreamReader reader = new StreamReader(stream);
string text = reader.ReadToEnd();
If stream has already ...
Set Locale programmatically
... set.add(all.get(i)); } Locale[] locales = set.toArray(new Locale[0]); configuration.setLocales(new LocaleList(locales)); inside @TargetApi(Build.VERSION_CODES.N) updateResourcesLocale()
– Vojtech Pohl
Jan 29 at 22:35
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How to efficiently count the number of keys/properties of an object in JavaScript?
...ld) This not only iterates through the object but also creates a whole new array with all its keys, so it completely fails at answering the question.
– GetFree
Jun 22 '12 at 14:28
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