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How do I calculate the normal vector of a line segment?
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if we define dx=x2-x1 and dy=y2-y1, then the normals are (-dy, dx) and (dy, -dx).
Note that no division is required, and so you're not risking dividing by zero.
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How can I make SQL case sensitive string comparison on MySQL?
I have a function that returns five characters with mixed case. If I do a query on this string it will return the value regardless of case.
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What's the difference between hard and soft floating point numbers?
...t my executable uses hard floats but my libc uses soft floats. What's the difference?
5 Answers
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How to sort strings in JavaScript
.... You may also see the following code used that doesn't respect a locale:
if (item1.attr < item2.attr)
return -1;
if ( item1.attr > item2.attr)
return 1;
return 0;
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Programmatically fire button click event?
...nswer, but more flexible as it'll keep track of the buttons actual actions if you change them or add more than one.
[button sendActionsForControlEvents:UIControlEventTouchUpInside];
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curl : (1) Protocol https not supported or disabled in libcurl
...ndows SSL-enabled cURL curl.haxx.se/latest.cgi?curl=win64-ssl-sspi instead if none of the other provided answers works for windows.
– ganesh
Jan 8 '15 at 16:54
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In Vim, how do I delete everything within the double quotes?
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@funk-shun: See if da" does what you want. The mnemonic would be "delete a quote[block]". It deletes from quote to quote plus, I believe, any whitespace after the closing quote.
– Herbert Sitz
Apr 24 ...
Which gets priority, maxRequestLength or maxAllowedContentLength?
...mum request size supported by ASP.NET, whereas maxAllowedContentLength specifies the maximum length of content in a request supported by IIS. So you need to set both in order to upload large files: the smaller one "takes priority".
(I picked this up from http://forums.iis.net/t/1169846.aspx -- cre...
How much faster is Redis than mongoDB?
...s, features and operations (and maybe showing how the factor changes with different configurations and operations), etc, is Redis 10x faster?, 2x faster?, 5x faster?
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How to retrieve a user environment variable in CMake (Windows)
...--unset=NAME]... [NAME=VALUE]... COMMAND [ARG]...
Run command in a modified environment.
Just be aware that this may only work the first time. If CMake re-configures with one of the consecutive builds (you just call e.g. make, one CMakeLists.txt was changed and CMake runs through the genera...