大约有 3,000 项符合查询结果（耗时：0.0260秒） [XML]
How can I convert comma separated string into a List
...ad of throwing an exception), here's something that uses TryParse:
string csv = "1,2,3,4,a,5";
int mos = 0;
var intList = csv.Split(',')
.Select(m => { int.TryParse(m, out mos); return mos; })
.Where(m => m != 0)
.ToList();
//return...
java中的缓存技术该如何实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...一般的划分方法是从技术上划分,可以分成几种,内存,硬盘文件.数据库.
(1) 内存.将缓存放在内存中是最快的选择,任何程序直接操作内存都比操作硬盘要快的多,但是如果你的数据要考虑到break down的问题,因为放在内存中的数据我...
MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术
...CpropertyPage继承；然后在要添加该对话框为 属性页的类(头文件)里创建CpropertySheet类的一 [page]属性页的添加[/page]1．属性页的添加：
创建对话框的类，该类要从CpropertyPage继承；然后在要添加该对话框为 属性页的类(头文件)里...
Convert floats to ints in Pandas?
I've been working with data imported from a CSV. Pandas changed some columns to float, so now the numbers in these columns get displayed as floating points! However, I need them to be displayed as integers, or, without comma. Is there a way to convert them to integers or not display the comma?
...
Way to read first few lines for pandas dataframe
Is there a built-in way to use read_csv to read only the first n lines of a file without knowing the length of the lines ahead of time? I have a large file that takes a long time to read, and occasionally only want to use the first, say, 20 lines to get a sample of it (and prefer not to load the...
数据挖掘——分词入门 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...匹配上了就赋值
matchPos = matchPosTmp; //同时保存好匹配位置
}
i++;
}
if (!matchWord.isEmpty()) {
//有匹配结果就输出最大长度匹配字符串
j = matchPos;
...
Converting Select results into Insert script - SQL Server [closed]
... part i
--have used below variable
------@CSV_COLUMN-------
values(Col1 data in quote, Col2..quote,..Col5..quote)
-- To achieve this part
-- i.e column data in
--quote i have used
--below variable
----@QUOTED_DATA---
C)To get above data from existing
table ...
Good reasons NOT to use a relational database?
..., but with a bit more ability to validate the structure.
Spreadsheet / CSV file
Very easy model for business users to understand
Subversion (or similar disk based version control system)
Very good support for versioning of data
Berkeley DB (Basically, a disk based hashtable)
Very s...
python pandas remove duplicate columns
...probably with the duplicate column titles.
For a sample table file 'dummy.csv' I made up:
Time H1 N2 Time N2 Time Relative
3 13 13 3 13 0
1 15 15 1 15 14
14 19 19 14 19 14
19 5 5 19 5 1
using read_table gives unique columns and works properly:
In [151]: df2 =...
Alternative to google finance api [closed]
...hoo Finance API posted on
Google Code.
For beginners, you can generate a CSV with a simple API call:
http://finance.yahoo.com/d/quotes.csv?s=AAPL+GOOG+MSFT&f=sb2b3jk
(This will generate and save a CSV for AAPL, GOOG, and MSFT)
Note that you must append the format to the query string (f=..)...