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How to get all subsets of a set? (powerset)
... number as an element of the super set in which 1 means that an element at index j should be added, and 0 means that this element should not be added.
I am using a set comprehension to generate a subset at each iteration, and I convert this subset into a frozenset so I can add it to ps (power set)....
Remove files from Git commit
...t will take the file as it was in the previous commit, and stage it in the index. The file in the working directory is untouched.
The git commit will then commit and squash the index into the current commit.
This essentially takes the version of the file that was in the previous commit and adds it ...
How to debug Lock wait timeout exceeded on MySQL?
...FERENCES `file` (`file_id`)
Trying to delete or update in parent table, in index `PRIMARY` tuple:
DATA TUPLE: 17 fields;
0: len 36; hex 36646261666133392d376630302d303030312d353166322d343132613435306265356363; asc 6dbafa39-7f00-0001-51f2-412a450be5cc;; 1: len 6; hex 000024214f7e; asc $!O~;; 2: le...
Collect successive pairs from a stream
...teful pipeline stages are quite limited, and doing things like getting the index of the current stream element and accessing adjacent stream elements are not supported.
A typical way to solve these problems, with some limitations, of course, is to drive the stream by indexes and rely on having the ...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
... need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated.
8...
In Clojure, when should I use a vector over a list, and the other way around?
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When to use a vector:
Indexed access performance - You get ~O(1) cost for indexed access vs. O(n) for lists
Appending - with conj is ~O(1)
Convenient notation - I find it both easier to type and to read [1 2 3] than '(1 2 3) for a literal list in ...
How can I create an array with key value pairs?
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My PHP is a little rusty, but I believe you're looking for indexed assignment. Simply use:
$catList[$row["datasource_id"]] = $row["title"];
In PHP arrays are actually maps, where the keys can be either integers or strings. Check out PHP: Arrays - Manual for more information.
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Importing a CSV file into a sqlite3 database table using Python
...= pandas.read_csv(csvfile)
df.to_sql(table_name, conn, if_exists='append', index=False)
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Set element focus in angular way
...how I could conditionally set a focus function for <input> based on $index for example?
– Garret Wilson
Jan 26 '18 at 22:08
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(![]+[])[+[]]… Explain why this works
...cification, (that's why the charAt method existed).
However this kind of "index properties" that represent the characters of a string were standardized on ECMAScript 5, and even before the standardization the feature was available in a good number of browsers (even in IE8 (standards mode)).
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