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How to test if list element exists?
... to check that the name is actually defined in the list:
foo <- list(a=42, b=NULL)
foo
is.null(foo[["a"]]) # FALSE
is.null(foo[["b"]]) # TRUE, but the element "exists"...
is.null(foo[["c"]]) # TRUE
"a" %in% names(foo) # TRUE
"b" %in% names(foo) # TRUE
"c" %in% names(foo) # FALSE
...and foo[[...
Pandas groupby: How to get a union of strings
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In [4]: df = read_csv(StringIO(data),sep='\s+')
In [5]: df
Out[5]:
A B C
0 1 0.749065 This
1 2 0.301084 is
2 3 0.463468 a
3 4 0.643961 random
4 1 0.866521 string
5 2 0.120737 !...
How to decode Unicode escape sequences like “\u00ed” to proper UTF-8 encoded characters?
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Try this:
$str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) {
return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
}, $str);
In case it's UTF-16 based C/C++/Java/Json-style:
$str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', funct...
Vagrant reverse port forwarding?
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134
When you run vagrant ssh, it's actually using this underlying command:
ssh -p 2222 -o UserKnown...
Get class that defined method
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edited Jun 20 '14 at 19:44
Aaron Hall♦
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Why is a combiner needed for reduce method that converts type in java 8
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4 Answers
4
Active
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How to serialize an object to XML without getting xmlns=“…”?
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143
Ahh... nevermind. It's always the search after the question is posed that yields the answer. ...
DataSet panel (Report Data) in SSRS designer is gone
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340
With a report (rdl) file selected in your solution, select View and then Report Data.
It is a ...
What is the difference between `sorted(list)` vs `list.sort()`?
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edited Sep 25 '16 at 8:34
answered Mar 16 '14 at 20:21
Ma...
Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
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+++ b/DbConnector
@@ -0,0 +1 @@
+Subproject commit c3f01dc8862123d317dd46284b05b6892c7b29bc
虽然 DbConnector 是工作目录中的一个子目录，但 Git 还是会将它视作一个子模块。当你不在那个目录中时，Git 并不会跟踪它的内容， 而是将它看作子模...