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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
I have a data.frame that looks like this.
6 Answers
6
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REST URI convention - Singular or plural name of resource while creating it
I'm new to REST and I've observed that in some RESTful services they use different resource URI for update/get/delete and Create. Such as
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Favourite performance tuning tricks [closed]
When you have a query or stored procedure that needs performance tuning, what are some of the first things you try?
29 Answ...
Append a dictionary to a dictionary [duplicate]
I have two existing dictionaries, and I wish to 'append' one of them to the other. By that I mean that the key,values of the other dictionary should be made into the first dictionary. For example:
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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?
Recently I've been thinking about securing some of my code. I'm curious how one could make sure an object can never be created directly, but only via some method of a factory class. Let us say I have some "business object" class and I want to make sure any instance of this class will have a valid in...
How do I put an already-running process under nohup?
I have a process that is already running for a long time and don't want to end it.
11 Answers
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File changed listener in Java
I'd like to be notified when a file has been changed in the file system. I have found nothing but a thread that polls the lastModified File property and clearly this solution is not optimal.
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The modulo operation on negative numbers in Python
I've found some strange behaviour in Python regarding negative numbers:
8 Answers
8
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How to debug Ruby scripts [closed]
I copied the following Ruby code from the Internet and made a few changes but it doesn't work.
17 Answers
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What does the Java assert keyword do, and when should it be used?
What are some real life examples to understand the key role of assertions?
18 Answers
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