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How to get current working directory in Java?
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One way would be to use the system property System.getProperty("user.dir"); this will give you "The current working directory when the properties were initialized". This is probably what you want. to find out where the java c...
How do I calculate the normal vector of a line segment?
...(x', y') = (-y, x) and (x', y') = (y, -x) seems to be right, but why would one use dx and dy here. Moreover, based on slopes, m1 * m2 = -1 for right angle lines, hence dy' = dx' * (-dx/dy) and dx' = dy' * (-dy/dx), how come in your equation normal.x = x' = -dy?
– legends2k
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How to see which plugins are making Vim slow?
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Just in case anyone else is wondering, this doesn't exist in all vim/gvim distros. Doesn't in a stock Win Gvim 7.4 over here (though it is documented in viminfo)
– thynctank
Aug 26 '14 at 16:28
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Good examples of Not a Functor/Functor/Applicative/Monad?
While explaining to someone what a type class X is I struggle to find good examples of data structures which are exactly X.
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SQL Server reports 'Invalid column name', but the column is present and the query works through mana
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I suspect that you have two tables with the same name. One is owned by the schema 'dbo' (dbo.PerfDiag), and the other is owned by the default schema of the account used to connect to SQL Server (something like userid.PerfDiag).
When you have an unqualified reference to a schema ...
How do I (or can I) SELECT DISTINCT on multiple columns?
...ND s1.ctid <> s.ctid
Every table should have a primary key. Add one if you didn't have one, yet. I suggest a serial or an IDENTITY column in Postgres 10+.
Related:
In-order sequence generation
Auto increment table column
How is this faster?
The subquery in the EXISTS anti-semi-join ...
Is it more efficient to copy a vector by reserving and copying, or by creating and swapping? [duplic
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They aren't the same though, are they? One is a copy, the other is a swap. Hence the function names.
My favourite is:
a = b;
Where a and b are vectors.
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Can I control the location of .NET user settings to avoid losing settings on application upgrade?
... answered Mar 7 '09 at 4:40
uzbonesuzbones
1,38699 silver badges1515 bronze badges
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Floating point vs integer calculations on modern hardware
...r math. The Alpha processor had a FP divide instruction but not an integer one, so integer division had to be done in software.
– Gabe
Mar 31 '10 at 4:49
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Is there a link to the “latest” jQuery library on Google APIs? [duplicate]
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Linking to the google API one is likely to increase your website speed due to the fact that there is a high chance your user already has it cached from another website, and therefore will not need to download it again from you. Hosting it yourself jus...