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Moving average or running mean
...mylist = [1, 2, 3, 4, 5, 6, 7]
N = 3
cumsum, moving_aves = [0], []
for i, x in enumerate(mylist, 1):
cumsum.append(cumsum[i-1] + x)
if i>=N:
moving_ave = (cumsum[i] - cumsum[i-N])/N
#can do stuff with moving_ave here
moving_aves.append(moving_ave)
...
How do you set, clear, and toggle a single bit?
...y more than the width of a long. The same applies to all the rest of the examples.
Clearing a bit
Use the bitwise AND operator (&) to clear a bit.
number &= ~(1UL << n);
That will clear the nth bit of number. You must invert the bit string with the bitwise NOT operator (~), then AND ...
How to create a HashMap with two keys (Key-Pair, Value)?
...Map. But I want to access the elements from the HashMap based on Array Index. Something like:
12 Answers
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Minimizing NExpectation for a custom distribution in Mathematica
...magic.
First let's see what the MeanResidualLife is, as you defined it. NExpectation or Expectation compute the expected value.
For the expected value, we only need the PDF of your distribution. Let's extract it from your definition above into simple functions:
pdf[a_, b_, m_, s_, x_] := (1/(2*(a...
How to find list of possible words from a letter matrix [Boggle Solver]
...know this game as Boggle. Essentially, when the game starts you get a matrix of letters like so:
35 Answers
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Why use apparently meaningless do-while and if-else statements in macros?
...macro wrapped in what seems like a meaningless do while loop. Here are examples.
9 Answers
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How to validate an Email in PHP?
...ER_VALIDATE_EMAIL) !== false;
}
Note: For other uses (where you need Regex), the deprecated ereg function family (POSIX Regex Functions) should be replaced by the preg family (PCRE Regex Functions). There are a small amount of differences, reading the Manual should suffice.
Update 1: As pointed o...
Does the ternary operator exist in R?
...s the latest evaluation, if-else is equivalent to ?:.
> a <- 1
> x <- if(a==1) 1 else 2
> x
[1] 1
> x <- if(a==2) 1 else 2
> x
[1] 2
The power of R is vectorization. The vectorization of the ternary operator is ifelse:
> a <- c(1, 2, 1)
> x <- ifelse(a==1, 1, ...
Preserving signatures of decorated functions
Suppose I have written a decorator that does something very generic. For example, it might convert all arguments to a specific type, perform logging, implement memoization, etc.
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How to trim a file extension from a String in JavaScript?
For example, assuming that x = filename.jpg , I want to get filename , where filename could be any file name (Let's assume the file name only contains [a-zA-Z0-9-_] to simplify.).
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