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How do I get a UTC Timestamp in JavaScript?

While writing a web application, it makes sense to store (server side) all datetimes in the DB as UTC timestamps. 16 Answ...
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JSONP with ASP.NET Web API

...ms to be ok, but because the service exists on a separate site, trying to call it with JQuery errors with the "Not Allowed". So, this is clearly a case where I need to use JSONP. ...
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Call static method with reflection

... I prefer simplicity... private void _InvokeNamespaceClassesStaticMethod(string namespaceName, string methodName, params object[] parameters) { foreach(var _a in AppDomain.CurrentDomain.GetAssemblies()) { foreach(var _t in _a.GetTypes()) { ...
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Input and output numpy arrays to h5py

I have a Python code whose output is a sized matrix, whose entries are all of the type float . If I save it with the extension .dat the file size is of the order of 500 MB. I read that using h5py reduces the file size considerably. So, let's say I have the 2D numpy array named A . How do I ...
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Why is string concatenation faster than array join?

...ring concatenation. Beginning with version 1.0, the array technique is actually slower than using the plus operator in all cases. Other browsers have also optimized string concatenation, so Safari, Opera, Chrome, and Internet Explorer 8 also show better performance using the plus operator. Internet ...
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How do I output coloured text to a Linux terminal?

... You need to output ANSI colour codes. Note that not all terminals support this; if colour sequences are not supported, garbage will show up. Example: cout << "\033[1;31mbold red text\033[0m\n"; Here, \033 is the ESC character, ASCII 27. It is followed by [, then zero o...
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Can dplyr package be used for conditional mutating?

...and the conditions (except for the default value of NA at the end) are mutually exclusive, as is the case in the question, then we can use an arithmetic expression such that each term is multiplied by the desired result using na_if at the end to replace 0 with NA. df %>% mutate(g = 2 * (a == 2 ...
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Are PHP include paths relative to the file or the calling code?

...e location of A.PHP? That is, does it matter which file the include is called from, or only what the current working directory is- and what determines the current working directory? ...
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Compare two DataFrames and output their differences side-by-side

...original question The first step is to concatenate the DataFrames horizontally with the concat function and distinguish each frame with the keys parameter: df_all = pd.concat([df.set_index('id'), df2.set_index('id')], axis='columns', keys=['First', 'Second']) df_all It's pr...
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How do I output an ISO 8601 formatted string in JavaScript?

... There is already a function called toISOString(): var date = new Date(); date.toISOString(); //"2011-12-19T15:28:46.493Z" If, somehow, you're on a browser that doesn't support it, I've got you covered: if ( !Date.prototype.toISOString ) { ( functi...