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Matrix Transpose in Python
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Python 2:
>>> theArray = [['a','b','c'],['d','e','f'],['g','h','i']]
>>> zip(*theArray)
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i')]
Python 3:
>>> [*zip(*theArray)]
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i'...
Quicksort: Choosing the pivot
...er, picking any arbitrary element runs the risk of poorly partitioning the array of size n into two arrays of size 1 and n-1. If you do that often enough, your quicksort runs the risk of becoming O(n^2).
One improvement I've seen is pick median(first, last, mid);
In the worst case, it can still g...
No ConcurrentList in .Net 4.0?
...s involved is miniscule (increment an index and assign to an element in an array; that's really it). You would need a ton of concurrent writes to see any sort of lock contention on this; and even then, the average performance of each write would still beat out the more expensive albeit lockless impl...
Create UIActionSheet 'otherButtons' by passing in array, not varlist
I have an array of strings that I want to use for button titles on a UIActionSheet. Unfortunately, the otherButtonTitles: argument in the method invocation takes a variable length list of strings, not an array.
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Generate array of all letters and digits
Using ruby, is it possible to make an array of each letter in the alphabet and 0-9 easily?
7 Answers
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How to iterate through two lists in parallel?
...0].grid( b=True, which='minor', axis='both')
ax[0,1].plot( list_sizes, np.array(te)/np.array(tz), label='enumerate()', marker='.' )
ax[0,1].plot( list_sizes, np.array(ti)/np.array(tz), label='index-list', marker='.' )
ax[0,1].plot( list_sizes, np.array(tii)/np.array(tz), label='element of foo', mar...
Why does gulp.src not like being passed an array of complete paths to files?
I'm attempting to pass gulp.src an array of files that I want it to deal with. This is the array as it stands.
1 Answer
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How to get IntPtr from byte[] in C#
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Not sure about getting an IntPtr to an array, but you can copy the data for use with unmanaged code by using Mashal.Copy:
IntPtr unmanagedPointer = Marshal.AllocHGlobal(bytes.Length);
Marshal.Copy(bytes, 0, unmanagedPointer, bytes.Length);
// Call unmanaged code
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What does yield mean in PHP?
... we got there.
When we use range PHP, will execute it, create the entire array of numbers in memory and return that entire array to the foreach loop which will then go over it and output the values. In other words, the foreach will operate on the array itself. The range function and the foreach on...
The tilde operator in Python
...allow it. That's why you need to call .isnull() or np.isnan() on your data array first, and then invert the resulting boolean values.
– geofflee
Nov 7 '17 at 5:35
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