大约有 41,411 项符合查询结果（耗时：0.0369秒） [XML]
Are lists thread-safe?
... Thomas WoutersThomas Wouters
111k2121 gold badges136136 silver badges116116 bronze badges
1
...
Counting the number of elements with the values of x in a vector
...an just use table():
> a <- table(numbers)
> a
numbers
4 5 23 34 43 54 56 65 67 324 435 453 456 567 657
2 1 2 2 1 1 2 1 2 1 3 1 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 comfor...
Error handling principles for Node.js + Express.js applications?
...
3 Answers
3
Active
...
In Matlab, when is it optimal to use bsxfun?
... bsxfun with R2012b on my decently fast laptop.
For me, bsxfun is about 3 times faster than repmat. The difference becomes more pronounced if the arrays get larger
The jump in runtime of repmat happens around an array size of 1Mb, which could have something to do with the size of my processor ...
Are parallel calls to send/recv on the same socket valid?
...
3 Answers
3
Active
...
ThreadStatic v.s. ThreadLocal: is generic better than attribute?
...
3 Answers
3
Active
...
Android Studio says “cannot resolve symbol” but project compiles
...
237
No idea if this will work or not but my only thought so far: right click the jar file in file t...
How do I resize a Google Map with JavaScript after it has loaded?
...
answered Apr 13 '09 at 7:36
SingleNegationEliminationSingleNegationElimination
131k2424 gold badges238238 silver badges280280 bronze badges
...
What is the proper #include for the function 'sleep()'?
...
answered Feb 11 '13 at 18:03
simoncsimonc
39.2k99 gold badges7676 silver badges9999 bronze badges
...