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How can I multiply and divide using only bit shifting and adding?
...ultiplication can be decomposed into adding and shifting and back again. This is also why multiplication takes longer than bit shifts or adding - it's O(n^2) rather than O(n) in the number of bits. Real computer systems (as opposed to theoretical computer systems) have a finite number of bits, so mu...
Generate colors between red and green for a power meter?
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This should work - just linearly scale the red and green values. Assuming your max red/green/blue value is 255, and n is in range 0 .. 100
R = (255 * n) / 100
G = (255 * (100 - n)) / 100
B = 0
(Amended for integer maths, ti...
How do I create a URL shortener?
...h. However, you will realize that your proposed algorithm fails if your ID is a prime and greater than 52.
Theoretical background
You need a Bijective Function f. This is necessary so that you can find a inverse function g('abc') = 123 for your f(123) = 'abc' function. This means:
There must be ...
Create a GUID in Java
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edited Jul 16 '15 at 21:11
Basil Bourque
186k5757 ...
Creating an R dataframe row-by-row
...ataframe row-by-row in R. I've done some searching, and all I came up with is the suggestion to create an empty list, keep a list index scalar, then each time add to the list a single-row dataframe and advance the list index by one. Finally, do.call(rbind,) on the list.
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Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied
... yet as root I cant access? I am running on ubuntu 12.04. No other mongo is running
28 Answers
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Disable ScrollView Programmatically?
I would like to enable ScrollView and disable it by a Button Click.
Disable means like if the ScrollView wasn't there.. and enable it returns the ScrollView.
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Correct file permissions for WordPress [closed]
...ve had a look over here but didn't find any details on the best file permissions. I also took a look at some of WordPress's form's questions over here too but anybody that suggests 777 obviously needs a little lesson in security.
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How to Reload ReCaptcha using JavaScript?
... form with AJAX so that I want to refresh Recaptcha image anytime an error is occured (i.e. username already in use).
10 An...
What are good message queue options for nodejs? [closed]
...with node.js. I looked at resque but not sure that's appropriate. The goal is to push notifications to clients based on backend and other client actions with socketio. I could do this with just socketio but I thought maybe a proper message queue would make this cleaner and I wouldn't have to reinven...