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What does .SD stand for in data.table in R
...ttps://sashat.me/2017/01/11/list-of-20-simple-distinct-colors/
col16 = c('#e6194b', '#3cb44b', '#ffe119', '#0082c8', '#f58231', '#911eb4',
'#46f0f0', '#f032e6', '#d2f53c', '#fabebe', '#008080', '#e6beff',
'#aa6e28', '#fffac8', '#800000', '#aaffc3')
par(oma = c(2, 0, 0, 0))
sappl...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
..., "age" : 20, "name" : "kobe" }
{ "_id" : ObjectId("5031144a50f2481577ea81e6"), "classid" : 1, "age" : 23, "name" : "nash" }
{ "_id" : ObjectId("5031145a50f2481577ea81e7"), "classid" : 2, "age" : 18, "name" : "james" }
{ "_id" : ObjectId("5031146a50f2481577ea81e8"), "classid" : 2, "age" : 19, "na...
推荐引擎easyrec半天学习分享 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
....getJSON(
"/easyrec-web/api/1.0/json/otherusersalsoviewed?apikey=32b0c25e6bc63bf1627dc7e877f81b3d&tenantid=EASYREC_DEMO&itemid=43",
function(transport) {
var json = eval(transport);
var items = json.recommendeditems.item;
if( "undefined" == typeof(items.length) ) {
items = new Arr...
IE无法设置短域名下Cookie - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的人有帮助。
原文链接：http://www.imkevinyang.com/2010/09/ie%E6%97%A0%E6%B3%95%E8%AE%BE%E7%BD%AE%E7%9F%AD%E5%9F%9F%E5%90%8D%E4%B8%8Bcookie.html
短域名 Cookie
xunsearch主键重复、搜索结果重复 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...认已升级成功，请参考：https://fun123.cn/?q=%E5%A6%82%E4%BD%95%E6%9F%A5%E7%9C%8B+xunsearch+%E7%89%88%E6%9C%AC&x=0&y=0xunsearch 主键重复
微数据库功能求助 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...tps://www.fun123.cn/reference/creative/screen_communication.html#%E5%BE%AE%E6%95%B0%E6%8D%AE%E5%BA%93%E4%BC%A0%E5%80%BC
What does the git index contain EXACTLY?
...ription adjusts to the recent SHA-256 work.
See commit 8afa50a, commit 0756e61, commit 123712b, commit 5b6422a (15 Aug 2020) by Martin Ågren (none).
(Merged by Junio C Hamano -- gitster -- in commit 74a395c, 19 Aug 2020)
index-format.txt: document SHA-256 index format
Signed-off-by: Martin Ågren
...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...faster than drop:
%%timeit
test = pd.DataFrame({'x': np.random.randn(int(1e6))})
test = test[test.x < 0]
# 54.5 ms ± 2.02 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
%%timeit
test = pd.DataFrame({'x': np.random.randn(int(1e6))})
test.drop(test[test.x > 0].index, inplace=True)
#...
How to debug Lock wait timeout exceeded on MySQL?
...x 36646234376337652d376630302d303030312d353166322d3431326132346664656366352e6d7033; asc 6db47c7e-7f00-0001-51f2-412a24fdecf5.mp3;; 7: len 21; hex 416e67656c73204e6f7720436f6e666572656e6365; asc Angels Now Conference;; 8: len 34; hex 416e67656c73204e6f7720436f6e666572656e6365204a756c7920392c203230313...
Convert a timedelta to days, hours and minutes
...t to take into account fractions of a second
seconds += td.microseconds / 1e6
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