大约有 46,000 项符合查询结果（耗时：0.0532秒） [XML]
Weighted random numbers
...r greater and is less than the sum of the weights
3) go through the items one at a time, subtracting their weight from your random number, until you get the item where the random number is less than that item's weight
Pseudo-code illustrating this:
int sum_of_weight = 0;
for(int i=0; i<num_cho...
Difference between core and processor
...utation unit of the CPU - it can run a single program context (or multiple ones if it supports hardware threads such as hyperthreading on Intel CPUs), maintaining the correct program state, registers, and correct execution order, and performing the operations through ALUs. For optimization purposes,...
Test whether string is a valid integer
...t in a shell script. If the user provided a valid integer, the script does one thing, and if not valid, it does something else. Trouble is, I haven't found an easy (and reasonably elegant) way of doing this - I don't want to have to pick it apart char by char.
...
CharSequence VS String in Java?
...ce is an interface.
Several classes implement this interface.
String is one such class, a concrete implementation of CharSequence.
You said:
converting from one to another
There is no converting from String.
Every String object is a CharSequence.
Every CharSequence can produce a Strin...
xkcd style graphs in MATLAB
...,[0.8 0.65],...
'string',sprintf('text%shere',char(10)),'headStyle','none','lineWidth',1.5,...
'fontName','Comic Sans MS','fontSize',14,'verticalAlignment','middle','horizontalAlignment','left')
%# capture with export_fig
im = export_fig('-nocrop',fh);
%# add a bit of border to avoid bla...
Cleaning up the iPhone simulator
...clean up the directory where xcode deploys an app when building for the iPhone simulator? I have a sqlite database that gets copied into the Documents folder on startup if necessary. The problem is that I might change my schema, but the new database won't get copied, because one already exists.
...
Ignoring time zones altogether in Rails and PostgreSQL
...
The data type timestamptz is the short name for timestamp with time zone.
The other option timestamp is short for timestamp without time zone.
timestamptz is the preferred type in the date/time family, literally. It has typispreferred set in pg_type, which can be relevant:
Generating time ser...
When should I use a List vs a LinkedList
...
There is one benefit to LinkedList over List (this is .net specific): since the List is backed by an internal array, it is allocated in one contiguous block. If that allocated block exceeds 85000 bytes in size, it will be allocated on...
Set every cell in matrix to 0 if that row or column contains a 0
...esets 1st line/col depending on l and c.
I doubt strongly that I can be done in 1 pass as squares in the beginning depend on squares in the end. Maybe my 2nd pass can be made more efficient...
import pprint
m = [[1, 0, 1, 1, 0],
[0, 1, 1, 1, 0],
[1, 1, 1, 1, 1],
[1, 0, 1, 1, 1],
...
Difference between CR LF, LF and CR line break types?
...floppy disk space were at a premium, some OS designers decided to only use one of the characters, they just didn't communicate very well with one another ;-)
Most modern text editors and text-oriented applications offer options/settings etc. that allow the automatic detection of the file's end-of-l...