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How to test if a string is JSON or not?
... look at examples of valid JSON texs containing only values tools.ietf.org/html/rfc8259#section-13 - RFC 8259 is designed to resolve possible ambiguities and confusions, just like this.
– Relequestual
Apr 19 '19 at 18:25
...
What's the status of multicore programming in Haskell?
...el Haskell
Google published their experience report on the use of Haskell (PDF)
Intel announced the Concurrent Collections for Haskell library, including scalability numbers -- scaling results for 32 and 48 cores
Sun/Oracle bought us a machine and funded work on improving parallel performance.
Recen...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...;a href="http://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html">
* Full VM options reference for Windows</a>
* @see <a href="http://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html">
* Full VM options reference for Linux, Mac OS X and Solaris<...
Exploitable PHP functions
...atime
filectime
filegroup
fileinode
filemtime
fileowner
fileperms
filesize
filetype
glob
is_dir
is_executable
is_file
is_link
is_readable
is_uploaded_file
is_writable
is_writeable
linkinfo
lstat
parse_ini_file
pathinfo
readfile
readlink
realpath
stat
gzfile
readgzfile
getimagesize
imagecreatefromgif...
How to fix the aspect ratio in ggplot?
...unding box.
(I also suggest you use ggsave to save your resulting plot to pdf/png/etc, rather than the pdf(); print(p); dev.off() sequence.)
library(ggplot2)
df <- data.frame(
x = runif(100, 0, 5),
y = runif(100, 0, 5))
ggplot(df, aes(x=x, y=y)) + geom_point() + coord_fixed()
...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...学的人一同学习之。
关于QR Code Specification，可参看这个PDF：http://raidenii.net/files/datasheets/misc/qr_code.pdf
基础知识
首先，我们先说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Ver...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...er guesses:
likelihood_of_red = stats.norm(red_mean_guess, red_std_guess).pdf(both_colours)
likelihood_of_blue = stats.norm(blue_mean_guess, blue_std_guess).pdf(both_colours)
Here, we have simply put each data point into the probability density function for a normal distribution using our current...
How to initialize a struct in accordance with C programming language standards
...ic storage duration." (https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html)
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What is the “assert” function?
...ndard draft
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf
19.3 Assertions
1 The header <cassert>, described in (Table 42), provides a macro for documenting C ++ program assertions
and a mechanism for disabling the assertion checks.
2 The contents are the same a...
How do I put two increment statements in a C++ 'for' loop?
... Ok. From open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2857.pdf section 6.5.3 the last part is an "expression". (Although 1.6 #2 defines an "expression-list" as a "list of expressions separated by commas", this construct does not appear in 6.5.3.). This means that when we write "++i,+...