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What is the purpose of the : (colon) GNU Bash builtin?
...r than true for portability to ancient Bourne-derived shells. As a simple example, consider having neither the ! pipeline operator nor the || list operator (as was the case for some ancient Bourne shells). This leaves the else clause of the if statement as the only means for branching based on exit ...
Numpy - add row to array
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What is X? If it is a 2D-array, how can you then compare its row to a number: i < 3?
EDIT after OP's comment:
A = array([[0, 1, 2], [0, 2, 0]])
X = array([[0, 1, 2], [1, 2, 0], [2, 1, 2], [3, 2, 0]])
add to A all rows from X w...
In Python, how do I create a string of n characters in one line of code?
...haracters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
...
asp.net mvc: why is Html.CheckBox generating an additional hidden input
I just noticed that Html.CheckBox("foo") generates 2 inputs instead of one, anybody knows why is this so ?
10 Answers
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What's the point of map in Haskell, when there is fmap?
...ical purposes has been part of the Haskell community since before Haskell existed, cf. A History of Haskell, so the comment in question is not in any way second-hand hearsay!
– C. A. McCann
Jul 26 '11 at 21:37
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.NET console application as Windows service
...t which could run as console application or as windows service if run for example from command line using switches.
10 Ans...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
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What is the most efficient way to concatenate N arrays?
...e way to go for convenience and likely performance.
var a = [1, 2], b = ["x", "y"], c = [true, false];
var d = a.concat(b, c);
console.log(d); // [1, 2, "x", "y", true, false];
For concatenating just two arrays, the fact that push accepts multiple arguments consisting of elements to add to the ar...
Android Camera Preview Stretched
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Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
...
How to save all the variables in the current python session?
...ew
for key in dir():
try:
my_shelf[key] = globals()[key]
except TypeError:
#
# __builtins__, my_shelf, and imported modules can not be shelved.
#
print('ERROR shelving: {0}'.format(key))
my_shelf.close()
To restore:
my_shelf = shelve.open(filename)...