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How do I change the background color of a plot made with ggplot2

... To change the panel's background color, use the following code: myplot + theme(panel.background = element_rect(fill = 'green', colour = 'red')) To change the color of the plot (but not the color of the panel), you can do: myplot + theme(plot.background = element_rect(fill = 'green', co...
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When to use window.opener / window.parent / window.top

... refers to the window that called window.open( ... ) to open the window from which it's called window.parent refers to the parent of a window in a <frame> or <iframe> window.top refers to the top-most window from a window nested in one or more layers of <iframe> sub-windows Those...
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What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?

What are the precise rules for when you can omit (omit) parentheses, dots, braces, = (functions), etc.? 6 Answers ...
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Releasing memory in Python

I have a few related questions regarding memory usage in the following example. 4 Answers ...
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How to check if an object is a certain type

I am passing various objects to a subroutine to run the same process but using a different object each time. For example, in one case I am using a ListView and in another case I am passing a DropDownList. ...
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Should enums in C# have their own file? [closed]

I have a class which uses an enumeration, the enum is currently in its own file which seems wasteful. 15 Answers ...
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Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?

I've started to use the IPython Notebook and am enjoying it. Sometimes, I write buggy code that takes massive memory requirements or has an infinite loop. I find the "interrupt kernel" option sluggish or unreliable, and sometimes I have to restart the kernel, losing everything in memory. ...
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Difference between fold and reduce?

...t confused when trying to distinguish between fold and reduce . Fold seems to do the same thing but takes an extra parameter. Is there a legitimate reason for these two functions to exist or they are there to accommodate people with different backgrounds? (E.g.: String and string in C#) ...
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How to redirect cin and cout to files?

... Here is an working example of what you want to do. Read the comments to know what each line in the code does. I've tested it on my pc with gcc 4.6.1; it works fine. #include <iostream> #include <fstream> #include <string> void ...
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Find unused code [closed]

...functions that are never used. How can I check for unused code, so I can remove all the unused functions? 9 Answers ...