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How to check if object (variable) is defined in R?
I'd like to check if some variable is defined in R - without getting an error. How can I do this?
6 Answers
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CSV in Python adding an extra carriage return, on Windows
It generates a file, test.csv , with an extra \r at each row, like so:
7 Answers
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java.lang.IllegalStateException: The specified child already has a parent
I am using fragments, when I instantiate a fragment the first time it it. but the second time I got this exception. I couldn't find the line where I got the error?
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Android Studio Project Structure (v.s. Eclipse Project Structure)
I'm trying to learn android development and I am initially confused by the different project structures between Eclipse and Android Studio. This makes it difficult to follow tutorials designed for Eclipse. Could anyone let me know why these differences exist? Should they exist?
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Storing R.drawable IDs in XML array
I would like to store drawable resources' ID in the form of R.drawable.* inside an array using an XML values file, and then retrieve the array in my activity.
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Outlook autocleaning my line breaks and screwing up my email format
I'm sending an email using the dotnet framework. Here is the template that I'm using to create the message:
11 Answers
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How do I grep recursively?
How do I recursively grep all directories and subdirectories?
25 Answers
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How can I handle R CMD check “no visible binding for global variable” notes when my ggplot2 syntax i
EDIT: Hadley Wickham points out that I misspoke. R CMD check is throwing NOTES, not Warnings. I'm terribly sorry for the confusion. It was my oversight.
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Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
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本文將介紹如何取得觸碰點的 RGB 參數之後透過 BLE 送給 Arduino 101 來點亮 RGB LED。
App InventorDesigner使用 Canvas 來取得觸碰點座標。兩個連線斷線用的按鈕：Btn_Connect / Btn_DisConnect三個用來呈現RGB值...
Group by with multiple columns using lambda
How can I group by with multiple columns using lambda?
5 Answers
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