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Adding a column to a data.frame

I have the data.frame below. I want to add a column that classifies my data according to column 1 ( h_no ) in that way that the first series of h_no 1,2,3,4 is class 1, the second series of h_no (1 to 7) is class 2 etc. such as indicated in the last column. ...
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How do I apply CSS3 transition to all properties except background-position?

I'd like to apply a CSS transition to all properties apart from background-position. I tried to do it this way: 6 Answers ...
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Custom HTTP headers : naming conventions

Several of our users have asked us to include data relative to their account in the HTTP headers of requests we send them, or even responses they get from our API. What is the general convention to add custom HTTP headers, in terms of naming , format ... etc. ...
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GitHub Error Message - Permission denied (publickey)

Anybody seen this error and know what to do? 36 Answers 36 ...
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How can I find the latitude and longitude from address?

I want to show the location of an address in Google Maps. 8 Answers 8 ...
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log4net hierarchy and logging levels

This site says 7 Answers 7 ...
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Convert XML to JSON (and back) using Javascript

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Cross-Domain Cookies

I have two webapps WebApp1 and WebApp2 in two different domains. 14 Answers 14 ...
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Difficulty with ng-model, ng-repeat, and inputs

I am trying to allow the user to edit a list of items by using ngRepeat and ngModel . ( See this fiddle .) However, both approaches I've tried lead to bizarre behavior: one doesn't update the model, and the other blurs the form on each keydown. ...
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Run certain code every n seconds [duplicate]

Is there a way to, for example, print Hello World! every n seconds? For example, the program would go through whatever code I had, then once it had been 5 seconds (with time.sleep() ) it would execute that code. I would be using this to update a file though, not print Hello World. ...