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How to convert ‘false’ to 0 and ‘true’ to 1 in Python
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@AlbertChen: no, because numpy arrays broadcast comparisons and don't produce a boolean value. Instead, comparisons produce an array of boolean values. I'm not sure what you expect from an arrayvalue == 'true' comparison, the question I answered here is sp...
Logical operator in a handlebars.js {{#if}} conditional
... <= v2,
gte: (v1, v2) => v1 >= v2,
and() {
return Array.prototype.every.call(arguments, Boolean);
},
or() {
return Array.prototype.slice.call(arguments, 0, -1).some(Boolean);
}
});
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Multiple linear regression in Python
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The reg_m function is unnecessarily complicated. x = np.array(x).T, x = sm.add_constant(x) and results = sm.OLS(endog=y, exog=x).fit() is enough.
– cd98
Nov 14 '14 at 23:26
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How to find a hash key containing a matching value
...; [["orange", {"client_id"=>"2180"}]]
Note that the result will be an array of all the matching values, where each is an array of the key and value.
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Deserialize JSON to ArrayList using Jackson
... compiled, but I get a run time exception when attempting to print out the arrayList.toString() about a NullPointerException. I'm guessing that this could be because my POJO does not conform to the right naming conventions for its properties, that is, the whole issue is that the web service returns ...
Generating Random Passwords
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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...
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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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]
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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) {
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