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How to repeat a string a variable number of times in C++?
...s in C++ equivalent to the * operator in Python or the x operator in Perl. If you're repeating a single character, the two-argument constructor (as suggested by previous answers) works well:
std::string(5, '.')
This is a contrived example of how you might use an ostringstream to repeat a string n...
Find and replace with sed in directory and sub directories
...the empty braces '{}', because fish automatically expands the empty braces if not quoted.
– Kevin Cherepski
Apr 5 '18 at 16:47
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Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
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I like that approach! If someone likes keep things close to processing dictionaries, one could also use update() instead of +=: for c in counters[1:]: res.update(c).
– Dr. Jan-Philip Gehrcke
Jan 22 '15 at 21:...
Unique combination of all elements from two (or more) vectors
...trying to create a unique combination of all elements from two vectors of different size in R.
5 Answers
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How can I grep hidden files?
...pt hidden ones and .* will match only hidden files. However this will fail if there are either no non-hidden files or no hidden files in a given directory. You could of course explicitly add .git instead of .*.
However, if you simply want to search in a given directory, do it like this:
grep -r se...
What is float in Java?
...ess precise than a double, the conversion cannot be performed implicitly.
If you want to create a float, you should end your number with f (i.e.: 3.6f).
For more explanation, see the primitive data types definition of the Java tutorial.
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Vim - how to run a command immediately when starting vim?
...plugins*
5. Set 'shellpipe' and 'shellredir'
6. Set 'updatecount' to zero, if "-n" command argument used
7. Set binary options
8. Perform GUI initializations
9. Read the viminfo file
10. Read the quickfix file
11. Open all windows
12. Execute startup commands
As you can see, your .vimrc will be lo...
Expanding a parent to the height of its children
...mendeth An overflow-value called "overlay" does not exist. What is working if the child divs are floated is declaring overflow:hidden.
– Christoph
Jul 11 '12 at 10:17
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how to read all files inside particular folder
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using System.IO;
//...
string[] files;
if (Directory.Exists(Path)) {
files = Directory.GetFiles(Path, @"*.xml", SearchOption.TopDirectoryOnly);
//...
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Best way to extract a subvector from a vector?
...egRogers: It doesn't make sense to use the big-O notation where N is a specific number. Big-O communicates the rate of growth with respect to how N changes. Johann: It's best not to use one variable name in two ways. We'd normally say either O(Y-X), or we'd say O(Z) where Z=Y-X.
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