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Determining complexity for recursive functions (Big O notation)
...Fun2(n-5);
}
This function is called n-5 for each time, so we deduct five from n before calling the function, but n-5 is also O(n).
(Actually called order of n/5 times. And, O(n/5) = O(n) ).
int recursiveFun3(int n)
{
if (n <= 0)
return 1;
else
return 1 + recursiveFun3(n...
deleting rows in numpy array
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The simplest way to delete rows and columns from arrays is the numpy.delete method.
Suppose I have the following array x:
x = array([[1,2,3],
[4,5,6],
[7,8,9]])
To delete the first row, do this:
x = numpy.delete(x, (0), axis=0)
To delete the thir...
Java equivalent of C#'s verbatim strings with @
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Coming from C# to Java it is quite often a step down in a lot of ways
– MikeKulls
Jul 25 '19 at 0:00
add a ...
How can I convert a datetime object to milliseconds since epoch (unix time) in Python?
... simplest way to do this is
import datetime
epoch = datetime.datetime.utcfromtimestamp(0)
def unix_time_millis(dt):
return (dt - epoch).total_seconds() * 1000.0
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What are “first class” objects?
...st class" in a given programming language, and why? In what do they differ from languages where they are not?
5 Answers
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Convert a list of data frames into one data frame
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Use bind_rows() from the dplyr package:
bind_rows(list_of_dataframes, .id = "column_label")
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How to use background thread in swift?
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@NikitaPronchik Isn't this clear from the answer? Else feel free to make a edit to it.
– tobiasdm
Mar 3 '15 at 21:16
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CSS3 Continuous Rotate Animation (Just like a loading sundial)
... A typical copy-paste error. Thanks a lot! (I actually got my css from shareaholic and because of the wrongly named property, it used the default ease timing function).
– doekman
Feb 15 '12 at 21:24
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How to get indices of a sorted array in Python
...is referring to the itemgetter function in the operator module, FYI. So do from operator import itemgetter to use it.
– Lauritz V. Thaulow
Jun 21 '11 at 11:12
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How do I use an INSERT statement's OUTPUT clause to get the identity value?
...UES ('Yatrix', '1234 Address Stuff', '1112223333')
You can use this also from e.g. C#, when you need to get the ID back to your calling app - just execute the SQL query with .ExecuteScalar() (instead of .ExecuteNonQuery()) to read the resulting ID back.
Or if you need to capture the newly inserte...