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Determine the number of NA values in a column

...nt the number of NA values in a data frame column. Say my data frame is called df , and the name of the column I am considering is col . The way I have come up with is following: ...
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gulp globbing- how to watch everything below directory

This is a pretty dumb question, but I haven't really been able to find a satisfactory answer: How do I use gulp globbing to select all files in all subdirectories below a certain directory? ...
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Server.UrlEncode vs. HttpUtility.UrlEncode

... HttpServerUtility.UrlEncode will use HttpUtility.UrlEncode internally. There is no specific difference. The reason for existence of Server.UrlEncode is compatibility with classic ASP. share | ...
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How to set the UITableView Section title programmatically (iPhone/iPad)?

... answered May 8 '12 at 20:27 AlladinianAlladinian 31.3k44 gold badges7575 silver badges8181 bronze badges ...
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UnmodifiableMap (Java Collections) vs ImmutableMap (Google) [duplicate]

...// Will return "F". In contrast to that, the ImmutableMap of Guava is really immutable: It is a true copy of a given map, and nobody may modify this ImmutableMap in any way. Update: As pointed out in a comment, an immutable map can also be created with the standard API using Map<String, S...
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Is there a better way of writing v = (v == 0 ? 1 : 0); [closed]

... @Brian: not with that magic + sign! ¯\_(ツ)_/¯ – jAndy Aug 2 '11 at 11:33 ...
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Error - Unable to access the IIS metabase

After installing Visual Studio 2012 and opening my solution I get a series of errors in this form: 37 Answers ...
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How do I scale a stubborn SVG embedded with the tag?

...nd this information here: https://blueprints.launchpad.net/inkscape/+spec/allow-browser-resizing share | improve this answer | follow | ...
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Handling JSON Post Request in Go

...can't find an example of Go handling a POST request of JSON data. They are all form POSTs. 7 Answers ...
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How do I get the current date and time in PHP?

...e time would go by your server time. An easy workaround for this is to manually set the timezone by using date_default_timezone_set before the date() or time() functions are called to. I'm in Melbourne, Australia so I have something like this: date_default_timezone_set('Australia/Melbourne'); Or...