大约有 1,200 项符合查询结果（耗时：0.0224秒） [XML]
Create an empty data.frame
...ames)
Alternatively specifying the col.names as a string:
df <- read.csv(text="Date,File,User", colClasses = colClasses)
Thanks to Richard Scriven for the improvement
share
|
improve this an...
How can I transform string to UTF-8 in C#?
...
Use the below code snippet to get bytes from csv file
protected byte[] GetCSVFileContent(string fileName)
{
StringBuilder sb = new StringBuilder();
using (StreamReader sr = new StreamReader(fileName, Encoding.Default, true))
{
St...
Include headers when using SELECT INTO OUTFILE?
...ment with lucek's answer and export dynamically table with columns name in CSV :
--If your table has too many columns
SET GLOBAL group_concat_max_len = 100000000;
--Prepared statement
SET @SQL = ( select CONCAT('SELECT * INTO OUTFILE \'YOUR_PATH\' FIELDS TERMINATED BY \',\' OPTIONALLY ENCLOSED BY \...
Stock ticker symbol lookup API [closed]
...ymbols, names, quotes, and all sorts of other data. Data is returned as a .CSV so you can request multiple symbols in one query.
So if you send:
http://finance.yahoo.com/d/quotes.csv?s=MSFT+F+ATT&f=sn
You'll get back something like:
"MSFT","Microsoft Corp"
"F","FORD MOTOR CO"
"ATT","AT&...
如何将 excel 中数据按坐标读取并显示到其他屏幕？ - App Inventor 2 中文...
...有excel操作相关功能，也没有现成的拓展。 目前只能处理csv(不带样式的excel)或txt纯文本数据，可考虑将excel保存为csv文件，将csv文件导入“数据文件”组件，从组件中获取相关数据。
其中，数据结构的设计是关键，得好好考...
Compress files while reading data from STDIN
...ad data as input and redirect the compressed to output file i.e.
cat test.csv | gzip > test.csv.gz
cat test.csv will send the data as stdout and using pipe-sign gzip will read that data as stdin. Make sure to redirect the gzip output to some file as compressed data will not be written to the t...
How to find where a method is defined at runtime?
...#crime>
If you're on Ruby 1.9+, you can use source_location
require 'csv'
p CSV.new('string').method(:flock)
# => #<Method: CSV#flock>
CSV.new('string').method(:flock).source_location
# => ["/path/to/ruby/1.9.2-p290/lib/ruby/1.9.1/forwardable.rb", 180]
Note that this won't work...
Principal component analysis in Python
..............................
if __name__ == "__main__":
import sys
csv = "iris4.csv" # wikipedia Iris_flower_data_set
# 5.1,3.5,1.4,0.2 # ,Iris-setosa ...
N = 1000
K = 20
fraction = .90
seed = 1
exec "\n".join( sys.argv[1:] ) # N= ...
np.random.seed(seed)
...
Warning message: In `…` : invalid factor level, NA generated
...
If you are reading directly from CSV file then do like this.
myDataFrame <- read.csv("path/to/file.csv", header = TRUE, stringsAsFactors = FALSE)
share
|
...
How can I get stock quotes using Google Finance API?
... very simple and useful.
For instance:
http://finance.yahoo.com/d/quotes.csv?s=GOOG+AAPL&f=snl1
Full details here:
http://www.gummy-stuff.org/Yahoo-data.htm
share
|
improve this answer
...