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John Carmack's Unusual Fast Inverse Square Root (Quake III)
...s derived is something of a mystery.
To quote Gary Tarolli:
Which actually is doing a floating
point computation in integer - it took
a long time to figure out how and why
this works, and I can't remember the
details anymore.
A slightly better constant, developed by an expert mathemat...
Right way to reverse pandas.DataFrame?
...ich returns 6. Then it tries to call data[j - 1] for j in range(6, 0, -1), and the first call would be data[5]; but in pandas dataframe data[5] means column 5, and there is no column 5 so it will throw an exception. ( see docs )
...
Make a float only show two decimal places
...ored, it is a matter of how you are displaying it. When converting it to a string you must round to the desired precision, which in your case is two decimal places.
E.g.:
NSString* formattedNumber = [NSString stringWithFormat:@"%.02f", myFloat];
%.02f tells the formatter that you will be formatt...
How to check if std::map contains a key without doing insert?
...
Use my_map.count( key ); it can only return 0 or 1, which is essentially the Boolean result you want.
Alternately my_map.find( key ) != my_map.end() works too.
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What is the difference between null and undefined in JavaScript?
...alert() this value, you won't see anything. However, if you append a blank string to it then suddenly it'll appear:
var s;
WScript.Echo(s);
WScript.Echo("" + s);
You can declare a variable, set it to null, and the behavior is identical except that you'll see "null" printed out versus "undefined"....
How can I convert an Integer to localized month name in Java?
...
import java.text.DateFormatSymbols;
public String getMonth(int month) {
return new DateFormatSymbols().getMonths()[month-1];
}
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Can I use Class.newInstance() with constructor arguments?
...
MyClass.class.getDeclaredConstructor(String.class).newInstance("HERESMYARG");
or
obj.getClass().getDeclaredConstructor(String.class).newInstance("HERESMYARG");
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What's the difference of strings within single or double quotes in groovy?
...y difference? Or just like javascript to let's input ' and " easier in strings?
2 Answers
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When would I use Task.Yield()?
... a lot but have never been using Task.Yield() and to be honest even with all the explanations I do not understand why I would need this method.
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How to read a text file into a string variable and strip newlines?
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To join all lines into a string and remove new lines, I normally use :
with open('t.txt') as f:
s = " ".join([x.strip() for x in f])
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