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How to determine if a number is a prime with regex?
...ce again the returning of the negation of the match result.
Do you see it now? It's unbelievably tricky (and computationally expensive!) but it's also kind of simple at the same time, once you get it. :-)
I can elaborate if you have further questions, like on how regex parsing actually works. But ...
Is there a good charting library for iPhone? [closed]
I have a need to render and display charts (bar charts for now, but more types may be needed later) in an iPhone app I'm working on. I've done some looking around and it doesn't look like there are any really good, mature charting libraries for iPhone yet. I've also looked for something written for ...
All Ruby tests raising: undefined method `authenticate' for nil:NilClass
...er! function is part of Rails 3 (using the new devise feature, of which I know little about). If the app can't find the User model (either because of namespace issues or whatever reason) then the method will fail. The "enki" application you linked to is now a Rails 3 application. It could be expe...
Update a dataframe in pandas while iterating row by row
...
now set_value is also deprectated, and should use .at (or .iat), so my loop looks like this: for i, row in df.iterrows(): ifor_val = something if <condition>: ifor_val = something_else df.at[i,'ifor'] = ifor_...
Schrödingers MySQL table: exists, yet it does not
...t on and try to recreate the table, it only creates the .ibd file. .frm is nowhere to be found. This only applies to a certain table (10+ others are created with correct files). Deleting that orphan ibd doesn't help anything anyway
– Corkscreewe
May 18 '12 at 1...
Use Visual Studio web.config transform for debugging [duplicate]
...et-web-projects-web-debug-config-web-release-config/.
Here is the summary.
Now let’s see how we can enable what the question asker wants to do.
To recap, when he builds on a particular configuration he wants a specific transform to be applied to web.config. So obviously you do not want to maintain...
asynchronous vs non-blocking
...Window messages, whereas .NET asynchronous IO is free-threaded (you don't know what thread your callback will be called on).
So they don't always mean the same thing. To distil the socket example, we could say:
Blocking and synchronous mean the same thing: you call the API, it hangs up the thread...
iPhone system font
... the situation. Personally, I wish I had hardcoded Helvetica... doing that now.
– Dan Rosenstark
Aug 22 '13 at 0:06
To...
What's this =! operator? [duplicate]
...ls' operator. This usage was deprecated by the creation of Standard C, so now it means 'assign the logical inverse', as in a = !b. This is a good argument for always surrounding binary operators with spaces, just to make it clear to the humans reading the code what the compiler is thinking.
I'm a...
Shell one liner to prepend to a file
...table, and should not be relied upon for anything even vaguely important.
Now, with all that out of the way the answer was:
Creating another file descriptor for the file (exec 3<> yourfile) thence writing to that (>&3) seems to overcome the read/write on same file dilemma. Works for...