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Global and local variables in R
...anual/R-devel/library/base/html/get.html
Here you have a small example:
test.env <- new.env()
assign('var', 100, envir=test.env)
# or simply
test.env$var <- 100
get('var') # var cannot be found since it is not defined in this environment
get('var', envir=test.env) # now it can be found
...
Linux automake自动编译全攻略 - C/C++ - 清泛网 - 专注C/C++及内核技术
...图示如下：
核心配置如下：
configure.in：
AC_INIT([test], [1.0.0], [bugreport.test.com])
#指定项目名称和版本号
AM_INIT_AUTOMAKE(test, 1.0.0)
#检查编译器
AC_PROG_CC
AC_PROG_LIBTOOL
#输出Makefile文件
AC_CONFIG_FILES([
Makefile
lib/M...
Linux automake自动编译全攻略 - 脚本技术 - 清泛IT社区，为创新赋能！
...流程图示如下：
核心配置如下：
configure.in：
AC_INIT([test], [1.0.0], [bugreport.test.com])
#指定项目名称和版本号
AM_INIT_AUTOMAKE(test, 1.0.0)
#检查编译器
AC_PROG_CC
AC_PROG_LIBTOOL
#输出Makefile文件
AC_CONFIG_FILES([
 ...
how to split the ng-repeat data with three columns using bootstrap
... the filter in a memoize function. lodash has a memoize function and the latest version of lodash also includes a chunk function, so we can create this filter very simply using npm modules and compiling the script with browserify or webpack.
Remember: display only! Filter in the controller if you'r...
How to measure elapsed time in Python?
...
Given a function you'd like to time,
test.py:
def foo():
# print "hello"
return "hello"
the easiest way to use timeit is to call it from the command line:
% python -mtimeit -s'import test' 'test.foo()'
1000000 loops, best of 3: 0.254 usec per loo...
Changing the selected option of an HTML Select element
.... I used post-increment instead of pre-increment, and then I added another test which is slightly faster than your 3rd test.
– kzh
Nov 4 '13 at 14:03
1
...
C# loop - break vs. continue
...s here just use the standard for loop, but will this work for pre and post tested while loops? The goto notation leads me to believe so, but need some verification.
– Daniel Park
Aug 8 '13 at 3:02
...
Find object by id in an array of JavaScript objects
...irst value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
If you want to find its index instead, use findIndex():
myArray.findIndex(x => x.id === '45');
From MDN:
The findIndex() method returns the index of the first e...
BackgroundWorker vs background Thread
...
Only use CancelAsync (and test for CancellationPending if your thread will be polling on short intervals, if you want to have an exception raised instead, use a System.Threading.Thread.Abort() which raises an exception within the thread block itself, ...
JavaScript math, round to two decimal places [duplicate]
...stackoverflow.com/a/32605063/1726511 Which seems to work well with all the tests I've tried.
There is one minor modification required though, the function in the answer linked above returns whole numbers when it rounds to one, so for example 99.004 will return 99 instead of 99.00 which isn't ideal f...