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Rename Files and Directories (Add Prefix)
... It should be "mv --" not just "mv", to guard against files starting with dashes, that would otherwise be interpreted as command switches. I will contribute an edit to correct this.
– Jacob C. says Reinstate Monica
Jul 31 '18 at 18:45
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离线版启动超时，有报错日志 - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
...r, com.google.appengine.tools.development.DevAppServerMain, --property=kickstart.user.dir=D:\appinventor\AppInventor2\resources\app.asar.unpacked, --disable_update_check, -a, 0.0.0.0, -p, 8088, D:\appinventor\AppInventor2\resources\app.asar.unpacked\Web]
Picked up JAVA_TOOL_OPTIONS: "-Dfile.enc...
Delete all records in a table of MYSQL in phpMyAdmin
...bleName;
Truncate: will also delete the rows from your table but it will start from new row with 1.
A detailed blog with example: http://sforsuresh.in/phpmyadmin-deleting-rows-mysql-table/
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Java: how to initialize String[]?
...allocate the correct memory storage for the String elements before you can start setting the index.
If you only declare the array (as you did) there is no memory allocated for the String elements, but only a reference handle to errorSoon, and will throw an error when you try to initialize a variabl...
Lua string to int
...point is present) and hexadecimal (both integers and floats, if the string starts by "0x" or "0X").
The following snippets are shorter but not equivalent :
a + 0 -- forces the conversion into float, due to how + works.
a | 0 -- (| is the bitwise or) forces the conversion into integer.
-- Howeve...
click() event is calling twice in jquery
... to call several times the methods with my events after some ajax calls it starts to become overclicked(I don't know if this word exist). For my situation it means a solution.
– Thiago C. S Ventura
Oct 15 '13 at 12:08
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Haskell Type vs Data Constructor
...ere a value is expected.
Data constructors
To make things simple, we can start with an example of a type that represents a colour.
data Colour = Red | Green | Blue
Here, we have three data constructors. Colour is a type, and Green is a constructor that contains a value of type Colour. Similarly...
How to draw an empty plot?
... coordinate system, so you need plot.new() and plot.window(), then you can start to add graph elements:
plot.new( )
plot.window( xlim=c(-5,5), ylim=c(-5,5) )
points( rnorm(100), rnorm(100) )
axis( side=1 )
example plot
s...
Big O, how do you calculate/approximate it?
...ting the number of steps. And by definition, every summation should always start at one, and end at a number bigger-or-equal than one.
f(N) = Summation(i from 1 to N)( Summation(j = 1 to (N - (i - 1) * 2)( C ) )
(We are assuming that foo() is O(1) and takes C steps.)
We have a problem here: when...
display:inline vs display:block [duplicate]
... of the screen
span default styling is display:inline block :span does not start on a new line and only takes up as much width as necessary
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