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How to initialize all members of an array to the same value?
...he corresponding elements will be initialized to 0), there's no easy way.
Don't overlook the obvious solution, though:
int myArray[10] = { 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 };
Elements with missing values will be initialized to 0:
int myArray[10] = { 1, 2 }; // initialize to 1,2,0,0,0...
So this w...
How to listen for changes to a MongoDB collection?
...nserts to a MongoDB collection before spawning workers to process the job? Do I need to poll every few seconds to see if there are any changes from last time, or is there a way my script can wait for inserts to occur? This is a PHP project that I am working on, but feel free to answer in Ruby or lan...
Error handling in Bash
... the code is already incompatible with POSIX removing the function keyword doesn't make it any more able to run under POSIX sh, but my main point was that you've (IMO) devalued the answer by weakening the recommendation to use set -e. Stackoverflow isn't about "your" code, it's about having the best...
Is there any downside for using a leading double slash to inherit the protocol in a URL? i.e. src=“/
I have a stylesheet that loads images from an external domain and I need it to load from https:// from secure order pages and http:// from other pages, based on the current URL. I found that starting the URL with a double slash inherits the current protocol. Do all browsers support this technique?...
What are the benefits of using C# vs F# or F# vs C#? [closed]
I work for a tech company that does more prototyping than product shipment. I just got asked what's the difference between C# and F#, why did MS create F# and what scenarios would it be better than C#.
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How to use Comparator in Java to sort
... @Esko: because of what polygenelubricants mentioned, I simply always do it like that, even though for an age (which will not become very large) the subtraction like you mention would do.
– Bart Kiers
May 15 '10 at 7:33
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C++ valarray vs. vector
...sors like the Crays.
For a vector processor, what you generally wanted to do was apply a single operation to an entire array, then apply the next operation to the entire array, and so on until you'd done everything you needed to do.
Unless you're dealing with fairly small arrays, however, that te...
Alter MySQL table to add comments on columns
I have been checking the MySQL Documentation for ALTER TABLE and it does not seem to include a way to add or modify a comment to a column. How can I do this?
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How to elegantly rename all keys in a hash in Ruby? [duplicate]
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I noticed that ages.map! doesn't seem to work... so had to do ages = Hash[ages.map {|k, v| [mappings[k] || k, v] }] to be able to call the variable again with the mapping.
– Chanpory
Nov 9 '10 at 20:32
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How can I convert an RGB image into grayscale in Python?
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How about doing it with Pillow:
from PIL import Image
img = Image.open('image.png').convert('LA')
img.save('greyscale.png')
Using matplotlib and the formula
Y' = 0.2989 R + 0.5870 G + 0.1140 B
you could do:
import numpy as np...