大约有 16,000 项符合查询结果（耗时：0.0224秒） [XML]
Counting the number of elements with the values of x in a vector
... 1 1 1
Then you can subset it:
> a[names(a)==435]
435
3
Or convert it into a data.frame if you're more comfortable working with that:
> as.data.frame(table(numbers))
numbers Freq
1 4 2
2 5 1
3 23 2
4 34 2
...
...
Why do people say there is modulo bias when using a random number generator?
...
Yuck :-P converting to a double, then multiplying by MAX_UPPER_LIMIT/RAND_MAX is much cleaner and performs better.
– boycy
Jun 13 '12 at 7:59
...
Monad in plain English? (For the OOP programmer with no FP background)
...To clarify the kind of understanding I was looking for, let's say you were converting an FP application that had monads into an OOP application. What would you do to port the responsibilities of the monads into the OOP app?
Most OOP languages do not have a rich enough type system to represent the ...
How does the getView() method work when creating your own custom adapter?
...it can be used for one of the new Views appearing. This reused View is the convertView. If this is null it means that there is no recycled View and we have to create a new one, otherwise we should use it to avoid creating a new.
3: The parent is provided so you can inflate your view into that for p...
How did Google manage to do this? Slide ActionBar in Android application
... items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = act.getLayoutInflater();
rowView = inflater.inflate(R.layout.menu_listitem,...
Base64: What is the worst possible increase in space usage?
...f a server received a base64 string and wanted to check it's length before converting,, say it wanted to always permit the final byte array to be 16KB. How big could a 16KB byte array possibly become when converted to a Base64 string (assuming one byte per character)?
...
What is the definition of “interface” in object oriented programming
...or. However, Java 8 introduced lambda expressions so the C# example can be converted to Java very easily (Func<int> becomes java.util.function.IntSupplier and => becomes ->).
share
|
imp...
Compare if BigDecimal is greater than zero
...on input for this simple things, it may help for complex scenario. you are converting to intvalue again. so cost to convert, and this will fail for 0.33 as it will convert to int 0
– P Satish Patro
Aug 26 at 14:35
...
Purpose of Unions in C and C++
...inter which cannot be used as a pointer of its own type, but must first be converted back to a pointer to the enclosing type or a character type. Any remotely-workable compiler will extend the language by making more things work than...
– supercat
Jun 28 '16 a...
What's the difference between comma separated joins and join on syntax in MySQL? [duplicate]
...istakenly forget comma in comma-separated join, second table automatically convert to table alias for first table. Not in all cases, but there is chances for something like this
share
|
improve this...