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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __x86_64 1
#define __UINT_FAST64_MAX__ 18446744073709551615ULL
#define __SIG_ATOMIC_TYPE__ int
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 1
#define __UINT_FAST8_MAX__ 255
#define __DEC64_MAX_EXP__ 385
...
Git pull a certain branch from GitHub
...
But I get an error "! [rejected]" and something about "non fast forward"
That's because Git can't merge the changes from the branches into your current master. Let's say you've checked out branch master, and you want to merge in the remote branch other-branch. When you do this:
$ ...
Fast way of finding lines in one file that are not in another?
...ts of filenames). Roughly 30.000 lines in each file. I am trying to find a fast way of finding lines in file1 that are not present in file2.
...
Why is it slower to iterate over a small string than a small list?
...ly thanks to the need to check what to return.
List indexing is remarkably fast.
>>> python3 -m timeit '[x for x in "abc"]'
1000000 loops, best of 3: 0.388 usec per loop
>>> python3 -m timeit '[x for x in ["a", "b", "c"]]'
1000000 loops, best of 3: 0.436 usec per loop
This...
Explain how finding cycle start node in cycle linked list work?
...nce travelled by slowPointer before meeting = x + y
Distance travelled by fastPointer before meeting = (x + y + z) + y
= x + 2y + z
Since fastPointer travels with double the speed of slowPointer, and time is constant f...
MySQL select 10 random rows from 600K rows fast
... * FROM tbl ORDER BY RAND() LIMIT 10) takes 0.35s on my machine.
This is fast because the sort phase only uses the indexed ID column. You can see this behaviour in the explain:
SELECT * FROM tbl ORDER BY RAND() LIMIT 10:
SELECT * FROM tbl AS t1 JOIN (SELECT id FROM tbl ORDER BY RAND() LIMIT 10)...
How to determine when a Git branch was created?
...
$ git reflog --date=local
763008c HEAD@{Fri Aug 20 10:09:18 2010}: pull : Fast-forward
f6cec0a HEAD@{Tue Aug 10 09:37:55 2010}: pull : Fast-forward
e9e70bc HEAD@{Thu Feb 4 02:51:10 2010}: pull : Fast forward
836f48c HEAD@{Thu Jan 21 14:08:14 2010}: checkout: moving from master to master
836f48c HEA...
Simple and fast method to compare images for similarity
I need a simple and fast way to compare two images for similarity. I.e. I want to get a high value if they contain exactly the same thing but may have some slightly different background and may be moved / resized by a few pixel.
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How do I iterate over an NSArray?
...truct is used to enumerate objects in a collection which conforms to the NSFastEnumeration protocol. This approach has a speed advantage because it stores pointers to several objects (obtained via a single method call) in a buffer and iterates through them by advancing through the buffer using point...
Why is MATLAB so fast in matrix multiplication?
...x multiplication which is why the plain MATLAB matrix multiplication is so fast. The gpuArray version uses MAGMA.
Update using R2014a on a machine with a Tesla K20c, and the new timeit and gputimeit functions:
>> A = rand(1024); gA = gpuArray(A);
>> timeit(@()A*A)
ans =
0.0324
>...