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How do I create an average from a Ruby array?
...r.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but you need to avoid integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only ma...
Split string to equal length substrings in Java
How to split the string "Thequickbrownfoxjumps" to substrings of equal size in Java.
Eg. "Thequickbrownfoxjumps" of 4 equal size should give the output.
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Using the star sign in grep
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The asterisk is just a repetition operator, but you need to tell it what you repeat. /*abc*/ matches a string containing ab and zero or more c's (because the second * is on the c; the first is meaningless because there's nothing for it to repeat). If yo...
Java's Virtual Machine and CLR
...etween MSIL and Java bytecode? , what is the (major) differences or similarity in how the Java Virtual Machine works versus how the .NET Framework Common Language Runtime (CLR) works?
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Is there a way to measure how sorted a list is?
...nversion of A.
The inversion number of a sequence is one common measure of its sortedness.Formally, the inversion number is defined to be the number of inversions, that is,
To make these definitions clearer, consider the example sequence 9, 5, 7, 6. This sequence has the inversions (0,1), (0,2), (...
How to change the button text of ?
I tried to modify the value , but it's not working. How to customize the button text?
21 Answers
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Truncating floats in Python
I want to remove digits from a float to have a fixed number of digits after the dot, like:
29 Answers
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How does Git handle symbolic links?
If I have a file or directory that is a symbolic link and I commit it to a Git repository, what happens to it?
4 Answers
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Defining a variable with or without export
...ss. You would use this for (say) loop variables, temporary variables etc.
It's important to note that exporting a variable doesn't make it available to parent processes. That is, specifying and exporting a variable in a spawned process doesn't make it available in the process that launched it.
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How do I force Postgres to use a particular index?
How do I force Postgres to use an index when it would otherwise insist on doing a sequential scan?
6 Answers
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