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How to calculate the angle between a line and the horizontal axis?

...2(deltaY, deltaX) * 180 / PI EDIT (Feb. 22, 2017): In general, however, calling atan2(deltaY,deltaX) just to get the proper angle for cos and sin may be inelegant. In those cases, you can often do the following instead: Treat (deltaX, deltaY) as a vector. Normalize that vector to a unit vector. ...
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Multiline strings in JSON

I'm writing some data files in JSON format and would like to have some really long string values split over multiple lines. Using python's JSON module I get a whole lot of errors, whether I use \ or \n as an escape. ...
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ERROR 2006 (HY000): MySQL server has gone away

... max_allowed_packet=64M Adding this line into my.cnf file solves my problem. This is useful when the columns have large values, which cause the issues, you can find the explanation here. On Windows this file is located at: ...
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Command prompt won't change directory to another drive

...| edited Jun 16 '12 at 17:32 answered Jun 16 '12 at 17:11 N...
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What is the difference between Serialization and Marshaling?

...d serialization are loosely synonymous in the context of remote procedure call, but semantically different as a matter of intent. In particular, marshaling is about getting parameters from here to there, while serialization is about copying structured data to or from a primitive form such as a byte...
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Convert one date format into another in PHP

...he y-m-d-h-i-s format. PHP 5.3 and up Use DateTime::createFromFormat. It allows you to specify an exact mask - using the date() syntax - to parse incoming string dates with. PHP 5.2 and lower You will have to parse the elements (year, month, day, hour, minute, second) manually using substr() and...
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What is the difference between a string and a byte string?

... @orety they do have to be encoded somehow internally for exactly that reason, but this isn't expos3s to you from Python code much like you don't have to care about how floating point numbers are stored. – lvc Nov 5 '17 at 22:43 ...
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Is it possible to specify a starting number for an ordered list?

... start="number" sucks because it doesn't automatically change based on the numbering before it. Another way to do this that may fit more complicated needs is to use counter-reset and counter-increment. Problem Say you wanted something like this: 1. Item one 2. Item two ...
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How to put the legend out of the plot

... You can make the legend text smaller by specifying set_size of FontProperties. Resources: Legend guide matplotlib.legend matplotlib.pyplot.legend matplotlib.font_manager set_size(self, size) Valid font size are xx-small, x-small, small, medium, large, x-...
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How to scroll to an element inside a div?

... This was really helpful! If you want to set the scroll multiple times you need to offset by your current scroll location. Here's how I did it in jQuery: $('#scrolling_div').scrollTop($('#scrolling_div').scrollTop() + $('#element_within_...