大约有 30,796 项符合查询结果（耗时：0.0387秒） [XML]
How do you get the magnitude of a vector in Numpy?
...an array: x.norm()" I totally agree. Usually when working with numpy I use my own Array and Matrix subclasses that have all functions I commonly use pulled in as methods. Matrix.randn([5,5])
– mdaoust
Feb 7 '12 at 12:10
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Java: how to initialize String[]?
... the exactly what the OPs question title suggests but i was trying to pass my string to a parameter that accepts String[] , this is the solution
– kommradHomer
Mar 31 '14 at 13:09
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What is the easiest way to remove the first character from a string?
...'length') { N.times { "[12,23,987,43"[1..STR.length] } }
end
Running on my Mac Pro:
1.9.3
user system total real
[0] 0.840000 0.000000 0.840000 ( 0.847496)
sub 1.960000 0.010000 1.970000 ( 1.962767)
gsub 4.350000 0.020000 4.370000 ( 4...
How to query nested objects?
... objects on which I can do stuff like conditions['some.path'] = 'value' in my business logic, then run a single query at the end: find(conditions, fields, callback);
– Ryan Wheale
May 21 '14 at 2:17
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Is there a perfect algorithm for chess? [closed]
...hat's actually been discovered about chess. But as a mathematician, here's my reasoning:
First we must remember that White gets to go first and maybe this gives him an advantage; maybe it gives Black an advantage.
Now suppose that there is no perfect strategy for Black that lets him always win/sta...
SQLite table constraint - unique on multiple columns
...an find syntax "charts" on this on the SQLite website, but no examples and my code is crashing. I have other tables with unique constraints on a single column, but I want to add a constraint to the table on two columns. This is what I have that is causing an SQLiteException with the message "syntax...
Rails auto-assigning id that already exists
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I think this is the best answer to my question, however, for unrelated reasons, i am going to have to find a way to use the strategy i described in my OP edit
– D-Nice
Jun 17 '12 at 21:32
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Firing a double click event from a WPF ListView item using MVVM
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I was scratching my head trying to figure out why it was working for all of you and not for me. I suddenly realised that within the context of the item template the data context is the current item from the itemssource and not the main window...
image.onload event and browser cache
... could you check if the image loads in IE? Wondering if it's an issue with my network or with IE and the image.
– Fabrício Matté
Sep 10 '12 at 17:29
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typecast string to integer - Postgres
...ble to comment (too little reputation? I'm pretty new) on Lukas' post.
On my PG setup to_number(NULL) does not work, so my solution would be:
SELECT CASE WHEN column = NULL THEN NULL ELSE column :: Integer END
FROM table
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