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How to make rounded percentages add up to 100%
...function foo(l, target) {
var off = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0);
return _.chain(l).
sortBy(function(x) { return Math.round(x) - x }).
map(function(x, i) { return Math.round(x) + (off > i) - (i >= (l.length + off)) })....
How can one see content of stack with GDB?
...rame info
To read the memory at given addresses you should take a look at x
x/x $esp for hex x/d $esp for signed x/u $esp for unsigned etc. x uses the format syntax, you could also take a look at the current instruction via x/i $eip etc.
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Why does Double.NaN==Double.NaN return false?
... returns false and any != comparison involving NaN returns true, including x!=x when x is NaN.
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join list of lists in python [duplicate]
Is the a short syntax for joining a list of lists into a single list( or iterator) in python?
15 Answers
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Why does this method print 4?
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I think the others have done a good job at explaining why cnt > 0, but there's not enough details regarding why cnt = 4, and why cnt varies so widely among different settings. I will attempt to fill that void here.
Let
X be the total stack size
M be the stack sp...
What are the differences between NP, NP-Complete and NP-Hard?
...lem: A problem with a yes or no answer.
Now, let us define those complexity classes.
P
P is a complexity class that represents the set of all decision problems that can be solved in polynomial time.
That is, given an instance of the problem, the answer yes or no can be decided in polynomial t...
Ruby's ||= (or equals) in JavaScript?
I love Ruby's ||= mechanism. If a variable doesn't exist or is nil , then create it and set it equal to something:
6 Ans...
What's the @ in front of a string in C#?
...ored.
So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"
There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @"""" evaluates to ".
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What does 'predicate' mean in the context of computer science? [duplicate]
Specifically I've seen it used in the context of text filtering. As if "predicate" == "filter criteria".
7 Answers
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Determine the number of NA values in a column
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Thank you for this. To expand this a little bit. In counting amount of arbitrary value, other than NA is writing a boolean function is.value and then using sum(is.value(df$col)) the way to go or is there a more concise direct syntax for this?
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