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How to create a sub array from another array in Java?
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You can use
JDK > 1.5
Arrays.copyOfRange(Object[] src, int from, int to)
Javadoc
JDK <= 1.5
System.arraycopy(Object[] src, int srcStartIndex, Object[] dest, int dstStartIndex, int lengthOfCopiedIndices);
Javadoc
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How are zlib, gzip and zip related? What do they have in common and how are they different?
...s of wrapping around the deflate streams. Those are: no wrapping at all ("raw" deflate), zlib wrapping, which is used in the PNG format data blocks, and gzip wrapping, to provide gzip routines for the programmer. The main difference between zlib and gzip wrapping is that the zlib wrapping is more ...
python pandas remove duplicate columns
...values()
ks = dcols.keys()
lvs = len(vs)
for i in range(lvs):
for j in range(i+1,lvs):
if vs[i] == vs[j]:
dups.append(ks[i])
break
return dups
Use it like this:
dups = duplicate_columns(frame...
Vim delete blank lines
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@soulmerge what about adding range 1,$/^\s$/d or using tags 'a,'b/^\s$/d? This does not work for me
– Alexander Cska
Jul 6 at 20:21
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc内存管理ptmalloc...
from list of integers, get number closest to a given value
...imeit -s "
from closest import take_closest
from random import randint
a = range(-1000, 1000, 10)" "take_closest(a, randint(-1100, 1100))"
100000 loops, best of 3: 2.22 usec per loop
$ python -m timeit -s "
from closest import with_min
from random import randint
a = range(-1000, 1000, 10)" "with_m...
How to remove items from a list while iterating?
...for tup in somelist[:]:
etc....
An example:
>>> somelist = range(10)
>>> for x in somelist:
... somelist.remove(x)
>>> somelist
[1, 3, 5, 7, 9]
>>> somelist = range(10)
>>> for x in somelist[:]:
... somelist.remove(x)
>>> somelist...
How to get the element clicked (for the whole document)?
...'div').on('click', function(){
var node = jQuery(this).get(0);
var range = document.createRange();
range.selectNodeContents( node );
window.getSelection().removeAllRanges();
window.getSelection().addRange( range );
});
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Best way of returning a random boolean value
...t; 0.5 is more technically correct. rand returns a result in the half-open range [0,1), so using < leads to equal odds of half-open ranges [0,0.5) and [0.5,1). Using > would lead to UNEQUAL odds of the closed range [0,0.5] and open range (.5,1).
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Javascript seconds to minutes and seconds
...umber s to the string (converting it to String as well)
}
Note: Negative range could be added by prepending (0>s?(s=-s,'-'):'')+ to the return expression (actually, (0>s?(s=-s,'-'):0)+ would work as well).
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