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How to check if object (variable) is defined in R?
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@Gavin & Dirk, you're so nice to each other :) Only solution is that you toss the coin (Bernoulli with p=0.5 :-)) who will get the accept! :-)
– TMS
Feb 20 '12 at 22:00
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bool to int conversion
...the answer is different for each of these languages.
In C language your examples has no relation to bool whatsoever (that applies to C99 as well). In C language relational operators do not produce bool results. Both 4 > 5 and 4 < 5 are expressions that produce results of type int with values ...
micro:bit 微控制器教程 · App Inventor 2 中文网
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右箭头：右转
// 按钮按下时发送指令
when Button_Forward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "F\n"
when Button_Backward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "B\n"
// 按钮释放时停止
when anyButton.TouchUp
do
call BluetoothL...
How to convert an NSString into an NSNumber
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Use an NSNumberFormatter:
NSNumberFormatter *f = [[NSNumberFormatter alloc] init];
f.numberStyle = NSNumberFormatterDecimalStyle;
NSNumber *myNumber = [f numberFromString:@"42"];
If the string is not a valid number, then myNumber will be nil. If it is a valid number, then you now have all of...
How do you do a case insensitive search using a pattern modifier using less?
... like the only way to do this is to pass the -i parameter in when you initially run less. Does anyone know of some secret hack to make something like this work
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access denied for load data infile in MySQL
I use MySQL queries all the time in PHP, but when I try
10 Answers
10
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Performing Inserts and Updates with Dapper
...s this dapper specific? I am new to dapper and was looking for an update example :)
– JP Hellemons
May 30 '12 at 13:16
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Calling virtual functions inside constructors
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Calling virtual functions from a constructor or destructor is dangerous and should be avoided whenever possible. All C++ implementations should call the version of the function defined at the level of the hierarchy in the cur...
How can I get the MD5 fingerprint from Java's keytool, not only SHA-1?
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Now MD5 & sha1 process changed Google After we got MD5 here.we need to get API key from Google API console right. thanks guys
– Crishnan Iyengar
Jul 12 '13 at 7:16
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How to enter a multi-line command
...when a statement clearly isn't complete, and looks to the next line. For example, imagine a cmdlet that takes an optional script block parameter:
Get-Foo { ............ }
if the script block is very long, you might want to write:
Get-Foo
{
...............
.............