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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
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中文网拓展
第...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 拓展参考文档
中文网拓展
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Android XML Percent Symbol
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The Android Asset Packaging Tool (aapt) has become very strict in its latest release and is no...
App Inventor 2 中文网原创内容 · App Inventor 2 中文网
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App Inventor 2 中文网原创内容
基础知识
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How do I specify local .gem files in my Gemfile?
... git protocol may be an issue. In such case try gem "foreman", :git => "https://github.com/pje/foreman.git"
– kode
Dec 11 '13 at 7:54
add a comment
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
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Using the data.table package, which is fast (useful for larger datasets)
https://github.com/Rdatatable/data.table/wiki
library(data.table)
df2 <- setDT(df1)[, lapply(.SD, sum), by=.(year, month), .SDcols=c("x1","x2")]
setDF(df2) # convert back to dataframe
Using the plyr package
require(pl...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
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Run an OLS regression with Pandas Data Frame
...efer to external packages like statsmodels, see some examples here: http://www.statsmodels.org/stable/regression.html
– javadba
Jan 25 '17 at 0:47
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App Inventor 2 Encrypt.Security 安全性扩展：MD5哈希，SHA1和SHA256哈希...
...程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索
App Inventor 2 Encrypt.Security 安全性扩展：MD5哈希，SHA1和SHA256哈希，AES加密/...
Android: View.setID(int id) programmatically - how to avoid ID conflicts?
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Yogu
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