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Quit and restart a clean R session from within R?
Is there a way I can make an alias, within R, that will execute q() and then restart a clean R session?
12 Answers
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Getting started with Haskell
...ck.
Now, in learning various imperative/OO languages (like C, Java, PHP), exercises have been a good way for me to go. But since I don't really know what Haskell is capable of and because there are many new concepts to utilize, I haven't known where to start.
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What does a tilde do when it precedes an expression?
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~ is a bitwise operator that flips all bits in its operand.
For example, if your number was 1, its binary representation of the IEEE 754 float (how JavaScript treats numbers) would be...
0011 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
So ~ converts its op...
How large should my recv buffer be when calling recv in the socket library
...at can hold the largest individual message / command you would reasonably expect (3000 is likely fine). If your protocol is transferring bulk data, then larger buffers can be more efficient - a good rule of thumb is around the same as the kernel receive buffer size of the socket (often something ar...
Subtract days from a date in JavaScript
...s anybody know of an easy way of taking a date (e.g. Today) and going back X days?
32 Answers
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There is already an open DataReader associated with this Command which must be closed first
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This can happen if you execute a query while iterating over the results from another query. It is not clear from your example where this happens because the example is not complete.
One thing that can cause this is lazy loading triggered when itera...
Send response to all clients except sender
...e sender
io.emit('message', "this is a test");
// sending to all clients except sender
socket.broadcast.emit('message', "this is a test");
// sending to all clients in 'game' room(channel) except sender
socket.broadcast.to('game').emit('message', 'nice game');
// sending to all clients in 'game' ...
How to resize a tableHeaderView of a UITableView?
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Perfect, thanks a bunch. To me, this is an example of one of the less desirable qualities of properties in Objective-C. There's no way for us to know (and no reason we should know) that setting the header has the side effect of recalculating the height. It should eithe...
What does @@variable mean in Ruby?
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A variable prefixed with @ is an instance variable, while one prefixed with @@ is a class variable. Check out the following example; its output is in the comments at the end of the puts lines:
class Test
@@shared = 1
def value
@@sh...
How to split one string into multiple strings separated by at least one space in bash shell?
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set $text [this will put the words into $1,$2,$3...etc]
– Rajesh
Apr 9 '14 at 2:40
35
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