大约有 43,000 项符合查询结果（耗时：0.0261秒） [XML]
What's the better (cleaner) way to ignore output in PowerShell? [closed]
...d some tests of the four options that I know about.
Measure-Command {$(1..1000) | Out-Null}
TotalMilliseconds : 76.211
Measure-Command {[Void]$(1..1000)}
TotalMilliseconds : 0.217
Measure-Command {$(1..1000) > $null}
TotalMilliseconds : 0.2478
Measure-Command {$null = $(1..1000)}
TotalMil...
Force R not to use exponential notation (e.g. e+10)?
... than ‘scipen’ digits wider.
Example:
R> ran2 <- c(1.810032e+09, 4)
R> options("scipen"=-100, "digits"=4)
R> ran2
[1] 1.81e+09 4.00e+00
R> options("scipen"=100, "digits"=4)
R> ran2
[1] 1810032000 4
That said, I still find it fudgeworthy. The most direct w...
Implementing slicing in __getitem__
...turn lists instead of new range objects (as it does):
>>> range(1,100, 4)[::-1]
range(97, -3, -4)
We can't subclass range because of internal limitations, but we can delegate to it:
class Range:
"""like builtin range, but when sliced gives a list"""
__slots__ = "_range"
def __i...
How to deal with persistent storage (e.g. databases) in Docker
...
In Docker release v1.0, binding a mount of a file or directory on the host machine can be done by the given command:
$ docker run -v /host:/container ...
The above volume could be used as a persistent storage on the host running Docker.
...
What is time_t ultimately a typedef to?
... another subject.
To answer paxdiablo's query, I'd say that it printed "19100" because the program was written this way (and I admit I did this myself in the '80's):
time_t now;
struct tm local_date_time;
now = time(NULL);
// convert, then copy internal object to our object
memcpy (&local_date...
Strange out of memory issue while loading an image to a Bitmap object
... load a bitmap of arbitrarily large size into an ImageView that displays a 100x100 pixel thumbnail, as shown in the following example code:
mImageView.setImageBitmap(
decodeSampledBitmapFromResource(getResources(), R.id.myimage, 100, 100));
You can follow a similar process to decode bitmaps f...
How to detect shake event with android?
...g curTime = System.currentTimeMillis();
// only allow one update every 100ms.
if ((curTime - lastUpdate) > 100) {
long diffTime = (curTime - lastUpdate);
lastUpdate = curTime;
x = values[SensorManager.DATA_X];
y = values[SensorManager.DATA_Y];
z = values[Sen...
How can I generate a unique ID in Python? [duplicate]
...)
id3 = next(unique_sequence)
ids = list(itertools.islice(unique_sequence, 1000))
no two returned id is the same (Unique) and this is based on a randomized seed value
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...
How to resize an image with OpenCV2.0 and Python2.6
...ze(image, (0,0), fx=0.5, fy=0.5)
and this will resize the image to have 100 cols (width) and 50 rows (height):
resized_image = cv2.resize(image, (100, 50))
Another option is to use scipy module, by using:
small = scipy.misc.imresize(image, 0.5)
There are obviously more options you can read...
Passing parameters to addTarget:action:forControlEvents
...[myButton buttonWithType:UIButtonTypeCustom];
[bt setFrame:CGRectMake(0,0, 100, 100)];
[bt setExclusiveTouch:NO];
[bt setUserData:**(insert user data here)**];
[bt addTarget:self action:@selector(touchUpHandler:) forControlEvents:UIControlEventTouchUpInside];
[view addSubview:bt];
Recieving func...