大约有 40,000 项符合查询结果（耗时：0.0597秒） [XML]
How to create GUID / UUID?
...
Actually, the RFC allows for UUIDs that are created from random numbers. You just have to twiddle a couple of bits to identify it as such. See section 4.4. Algorithms for Creating a UUID from Truly Random or Pseudo-Random Numbers: rfc-archive.org/getrfc.php?rfc=4122
...
Breadth First Vs Depth First
... Container
While (there are nodes in Container)
N = Get the "next" node from Container
Store all the children of N in Container
Do some work on N
The difference between the two traversal orders lies in the choice of Container.
For depth first use a stack. (The recursive implementation ...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
... if the execution of the program went good or bad. It's a sort of heredity from older programming languages where it's useful to know if something went wrong and what went wrong.
Exit code is
0 when execution went fine;
1, -1, whatever != 0 when some error occurred, you can use different values f...
Add a common Legend for combined ggplots
...
You may also use ggarrange from ggpubr package and set "common.legend = TRUE":
library(ggpubr)
dsamp <- diamonds[sample(nrow(diamonds), 1000), ]
p1 <- qplot(carat, price, data = dsamp, colour = clarity)
p2 <- qplot(cut, price, data = dsamp, ...
Manifest merger failed : uses-sdk:minSdkVersion 14
...
What about a library compiled from Maven ? How to exclude the "old" dependancy ?
– Arnaud
Jun 26 '14 at 19:41
4
...
Could not load file or assembly 'System.Net.Http.Formatting' or one of its dependencies. The system
...ystem.Web.Http to the new one installed by the above command... ie it went from <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0"/> to <bindingRedirect oldVersion="0.0.0.0-4.0.30319" newVersion="4.0.30319"/>
– Serj Sagan
Dec 3 '18 a...
Android and setting alpha for (image) view alpha
...ew ImageView(this);
myImageView.setAlpha(xxx);
In pre-API 11:
range is from 0 to 255 (inclusive), 0 being transparent and 255 being opaque.
In API 11+:
range is from 0f to 1f (inclusive), 0f being transparent and 1f being opaque.
...
Floating point vs integer calculations on modern hardware
...
Alas, I can only give you an "it depends" answer...
From my experience, there are many, many variables to performance...especially between integer & floating point math. It varies strongly from processor to processor (even within the same family such as x86) because diffe...
Is there a difference between using a dict literal and a dict constructor?
...
I think you have pointed out the most obvious difference. Apart from that,
the first doesn't need to lookup dict which should make it a tiny bit faster
the second looks up dict in locals() and then globals() and the finds the builtin, so you can switch the behaviour by defining a loca...
How do I resize an image using PIL and maintain its aspect ratio?
...ethod to do this: the method Image.thumbnail.
Below is an (edited) example from the PIL documentation.
import os, sys
import Image
size = 128, 128
for infile in sys.argv[1:]:
outfile = os.path.splitext(infile)[0] + ".thumbnail"
if infile != outfile:
try:
im = Image.ope...