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How to reset a single table in rails?
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To reset the index/primary key in SQLite just type:
$ rails console
> ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'")
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Understanding typedefs for function pointers in C
...= (*myFnPtr)(2.0, 5.1);
This makes good reading: http://www.newty.de/fpt/index.html
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Pandas index column title or name
How do I get the index column name in python pandas? Here's an example dataframe:
9 Answers
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How to empty a list?
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Which means: Splice in the list [] (0 elements) at the location [:] (all indexes from start to finish)
The [:] is the slice operator. See this question for more information.
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Equivalent C++ to Python generator pattern
...on is available in Boost boost.org/doc/libs/1_57_0/libs/coroutine/doc/html/index.html with a proposal for standardization here: open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3985.pdf
– boycy
Jan 13 '15 at 17:00
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Differences and relationship between glActiveTexture and glBindTexture
...bout the active texture.
Sampler uniforms are int values representing the index of the texture unit to use for the sampler (and not the texture object to use).
So you have to bind your texture objects to the units you want to use.
The type of the sampler will do the match with the texture target ...
How to make the 'cut' command treat same sequental delimiters as one?
...l -lane 'print $F[3]' text.txt
However, the @F autosplit array starts at index $F[0] while awk fields start with $1
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What is correct HTTP status code when redirecting to a login page?
...pires header field.
fits a login page most closely in my opinion. I initially considered 303 see other which would work just as well. After some thought, I'd say 302 Found is more fitting because the requested resource was found, there just is another page to go through before it can be accessed. ...
Algorithm to compare two images
...tricky).
http://en.wikipedia.org/wiki/RGB_color_space
http://upvector.com/index.php?section=tutorials&subsection=tutorials/colorspace
Another example involves something called the Hough Transform. This transform essentially decomposes an image into a set of lines. You can then take some of...
Modifying a subset of rows in a pandas dataframe
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Use .loc for label based indexing:
df.loc[df.A==0, 'B'] = np.nan
The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.:
df.loc[df.A==0, 'B'] = ...