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Postgres - FATAL: database files are incompatible with server
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If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your postgres data directory retaining all data:
brew postgresql-upgrade-database
The above command is taken from the output of brew info postgres
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Reading CSV files using C#
... DataGrid and show corrupted lines of the CSV file in another grid. For example, show the lines that are shorter than 5 values in another grid. I'm trying to do that like this:
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How to get folder path from file path with CMD
... can get a lot more information using different modifiers:
%~I - expands %I removing any surrounding quotes (")
%~fI - expands %I to a fully qualified path name
%~dI - expands %I to a drive letter only
%~pI - expands %I to a path only
%~nI - expands %I to a file ...
Best way to extract a subvector from a vector?
...he simplest way to construct a new vector consisting of a copy of elements X through Y, where 0
14 Answers
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How to check if a process id (PID) exists
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To check for the existence of a process, use
kill -0 $pid
But just as @unwind said, if you're going to kill it anyway, just
kill $pid
or you will have a race condition.
If you want to ignore the text output of kill and do something base...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...定随机数种子 (random set seed to)
最小值 (min)
最大值 (max)
平方根 (square root)
绝对值 (abs)
相反数 (neg)
对数 (log)
e^
四舍五入 (round)
上取整 (ceiling)
下取整 (floor)
求模 (modulo)
余数 (remainder)
商 (quotient)
正弦 (sin)
余...
What's the bad magic number error?
What's the "Bad magic number" ImportError in python, and how do I fix it?
15 Answers
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Consistency of hashCode() on a Java string
...ed behaviour for java.lang.String, so changing it would count as breaking existing contracts.
Wherever possible, you shouldn't rely on hash codes staying the same across versions etc - but in my mind java.lang.String is a special case simply because the algorithm has been specified... so long as yo...
Node.JS constant for platform-specific new line?
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Not sure if this is new in the 0.8.x but there is now a constant http://nodejs.org/api/os.html#os_os_eol
var endOfLine = require('os').EOL;
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Java: Static vs inner class [duplicate]
... Outer class, which means it does
not have enclosing instance.
See this example
class A
{
class B
{
// static int x; not allowed here
}
static class C
{
static int x; // allowed here
}
}
class Test
{
public static void main(String… str)
{
...