大约有 30,000 项符合查询结果（耗时：0.0376秒） [XML]
How to convert a data frame column to numeric type?
... char_fac = factor(letters[1:5]),
num = 1:5, stringsAsFactors = FALSE)
Let us have a glance at data.frame
> d
char fake_char fac char_fac num
1 a 1 1 a 1
2 b 2 2 b 2
3 c 3 3 c 3
4 d 4 ...
Remove characters from C# string
How might I remove characters from a string? For example: "My name @is ,Wan.;'; Wan" .
21 Answers
...
How do I convert from BLOB to TEXT in MySQL?
...ROUP_CONCATs that convert your output to blobs and you really want them as strings. I had an issue similar to the OP's while using Node.JS with the node-mysql library - this fixed all group_concat issues.
– marksyzm
Jul 26 '13 at 13:53
...
How to print VARCHAR(MAX) using Print Statement?
...
I used print(substring(@script, @Counter * 8000, (@Counter + 1) * 8000)) to print my script.
– Lukas Thum
Oct 9 '18 at 12:24
...
Max length for client ip address [duplicate]
...er for details about IPv4-mapped IPv6 addresses. (The correct maximum IPv6 string length is 45 characters.)
share
|
improve this answer
|
follow
|
...
Efficient way to remove ALL whitespace from String?
...s to remove all whitespace (including newlines) and doing this (XML is the string received from the web request):
16 Answer...
Why does string::compare return an int?
Why does string::compare return an int instead of a smaller type like short or char ? My understanding is that this method only returns -1, 0 or 1.
...
What is the C# equivalent of NaN or IsNumeric?
What is the most efficient way of testing an input string whether it contains a numeric value (or conversely Not A Number)? I guess I can use Double.Parse or a regex (see below) but I was wondering if there is some built in way to do this, such as javascript's NaN() or IsNumeric() (was that VB...
NSLog the method name with Objective-C in iPhone
...
print(__FUNCTION__) // Swift
NSLog(@"%@", NSStringFromSelector(_cmd)); // Objective-C
Swift 3 and above
print(#function)
share
|
improve this answer
|
...
OS detecting makefile
...gwin/MinGW/MSYS/Windows. See his answer that looks like that:
ifeq '$(findstring ;,$(PATH))' ';'
detected_OS := Windows
else
detected_OS := $(shell uname 2>/dev/null || echo Unknown)
detected_OS := $(patsubst CYGWIN%,Cygwin,$(detected_OS))
detected_OS := $(patsubst MSYS%,MSYS,$(d...