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Remove all special characters from a string [duplicate]
... and spaces
// Note that the hyphen must go last not to be confused with a range (A-Z)
// and the dot, NOT being special (I know. My life was a lie), is NOT escaped
$str = preg_replace('/[^A-Za-z0-9. -]/', '', $str);
// Replace sequences of spaces with hyphen
$str = preg_replace('/ */', '-', $str...
How to force a web browser NOT to cache images
... header("Pragma: no-cache");
// image related headers
header('Accept-Ranges: bytes');
header('Content-Length: '.strlen( $img )); // How many bytes we're going to send
header('Content-Type: image/jpeg'); // or image/png etc
// actual image
echo $img;
exit();
}
Actually either no-ca...
Understanding FFT output
...ifies to 1 Hz per bin. The bins N/2 to N represent negative frequencies (strange concept, I know). For your case they don't contain any significant information because they are just a mirror of the first N/2 frequencies.
Your real and imaginary parts of each bin form a complex number. It is okay if ...
C++ convert vector to vector
...
Use std::vector's range constructor:
std::vector<int> intVec;
std::vector<double> doubleVec(intVec.begin(), intVec.end());
share
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...
Writing to an Excel spreadsheet
...et1')
stimulusTimes = [1, 2, 3]
reactionTimes = [2.3, 5.1, 7.0]
for i in range(len(stimulusTimes)):
sheet['A' + str(i + 6)].value = stimulusTimes[i]
sheet['B' + str(i + 6)].value = reactionTimes[i]
wb.save('example.xlsx')
...
Better techniques for trimming leading zeros in SQL Server?
...unately, only works for numeric data, and sometimes the strings exceed the range for integer as well, so you'd have to use bigint.
– Cade Roux
Mar 19 '09 at 14:40
3
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Is there a decorator to simply cache function return values?
...turn n
return fib(n-1) + fib(n-2)
>>> print([fib(n) for n in range(16)])
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]
>>> print(fib.cache_info())
CacheInfo(hits=28, misses=16, maxsize=None, currsize=16)
If you are stuck with Python 2.x, here's a list of o...
Java Timestamp - How can I create a Timestamp with the date 23/09/2007?
...G and won't compile! Compile error: 09 is an octal number, but 9 is out of range for octals. Logic error: the month is 0-based, you will get OCTOBER 23th of 2007
– user85421
Jun 10 '09 at 13:31
...
How to determine whether a Pandas Column contains a particular value
...
I did a few simple tests:
In [10]: x = pd.Series(range(1000000))
In [13]: timeit 999999 in x.values
567 µs ± 25.6 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [15]: timeit x.isin([999999]).any()
9.54 ms ± 291 µs per loop (mean ± std. dev. of 7 runs,...
Comparing two NumPy arrays for equality, element-wise
... yoavram's comment)
It should be noted that:
this solution can have a strange behavior in a particular case: if either A or B is empty and the other one contains a single element, then it return True. For some reason, the comparison A==B returns an empty array, for which the all operator returns...