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How to prove that a problem is NP complete?
...o NP (that is that given a solution you can verify it in polynomial time)
Select a known NP-complete problem L'
Describe an algorithm f that transforms L' into L
Prove that your algorithm is correct (formally: x ∈ L' if and only if f(x) ∈ L )
Prove that algo f runs in polynomial time
...
How can I get Knockout JS to data-bind on keypress instead of lost-focus?
... "auto-populate" values ( like if the input field is named "firstname" ). selecting from the auto-populate doesnt work with "afterkeydown". is there a way to catch this?
– Anton
Sep 9 '12 at 0:01
...
How to use sessions in an ASP.NET MVC 4 application?
...SP.NET MVC. I have used PHP before and it was easy to create a session and select user records based on the current session variables.
...
Emacs mode for Stack Overflow's markdown
...s/, and then export to markdown.
From emacs you can convert to markdown by selecting the region, hitting C-u M-S-\ and typing pandoc -r org -t markdown, getting output like this:
In other words, you can keep writing in org-mode, including writing italics *like this*, and then export to markdown.
...
What is the purpose of “android.intent.category.DEFAULT”?
...ies, then Android will present all candidates to the user and the user can select his preferred default.
Reference:
http://developer.android.com/guide/components/intents-filters.html
Extract from that page:
Android treats all implicit intents passed tostartActivity() as if they contained at ...
Convert list of dictionaries to a pandas DataFrame
...o extract only the 0th and 2nd rows from data2 above, you can use:
rows_to_select = {0, 2}
for i in reversed(range(len(data2))):
if i not in rows_to_select:
del data2[i]
pd.DataFrame(data2)
# pd.DataFrame.from_dict(data2)
# pd.DataFrame.from_records(data2)
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0 5...
How can I discard remote changes and mark a file as “resolved”?
.... is important; passing in a file name (in this case, the whole directory) selects between two different modes of operation of checkout, one which switches branches and one which moves files from the index to the working copy. I agree, it's very confusing. You could also do git checkout --ours -- &l...
How do you fork your own repository on GitHub?
...our repo's main page on github.
Click the + icon in the top right corner.
Select "Import repository".
Where it asks for the "Old URL", paste the URL you copied at step #1
Enter the name of your new repo and click Begin Import.
That's it! You now have a copy of the full repo, with all commit histor...
Cannot create an NSPersistentStoreCoordinator with a nil model
...fore they aren't considered the same.
The quickest way to fix this, is to select the xcdatamodel file in your project navigator and in to the menu bar
Editor->Add Model Version...
and add a new version of your model. Make all changes to the new version.
This works in Xcode 5
...
Is it possible to force Excel recognize UTF-8 CSV files automatically?
...el
Import the data using Data-->Import External Data --> Import Data
Select the file type of "csv" and browse to your file
In the import wizard change the File_Origin to "65001 UTF" (or choose correct language character identifier)
Change the Delimiter to comma
Select where to import to and ...