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adding noise to a signal in python
...sinal):
regsnr=54
sigpower=sum([math.pow(abs(sinal[i]),2) for i in range(len(sinal))])
sigpower=sigpower/len(sinal)
noisepower=sigpower/(math.pow(10,regsnr/10))
noise=math.sqrt(noisepower)*(np.random.uniform(-1,1,size=len(sinal)))
return noise
...
How can I validate a string to only allow alphanumeric characters in it?
...assuming alphanumeric set is A-Z,a-z and 0-9 because this covers the whole range of Unicode letters and digits, which including non-Latin characters as well. For example, char.IsLetterOrDigit('ก') will return true. csharppad.com/gist/f96a6062f9f8f4e974f222ce313df8ca
– tia
...
Is there a way to define a min and max value for EditText in Android?
...Integer.parseInt(dest.toString() + source.toString());
if (isInRange(min, max, input))
return null;
} catch (NumberFormatException nfe) { }
return "";
}
private boolean isInRange(int a, int b, int c) {
return b > a ? c >= a &...
How does C compute sin() and other math functions?
...software algorithm is as fast as possible and also accurate over the whole range of x values, so the library implements several different algorithms, and its first job is to look at x and decide which algorithm to use.
When x is very very close to 0, sin(x) == x is the right answer.
A bit further ...
Minimum and maximum value of z-index?
... integer or real number as a value
actually restrict the value to some
range, often to a non-negative value.
So basically there are no limitations for z-index value in the CSS standard, but I guess most browsers limit it to signed 32-bit values (−2147483648 to +2147483647) in practice (64 wo...
How to join two generators in Python?
....chain.from_iterable you can do things like:
def genny(start):
for x in range(start, start+3):
yield x
y = [1, 2]
ab = [o for o in itertools.chain.from_iterable(genny(x) for x in y)]
print(ab)
share
|
...
Python: Append item to list N times
...you may wish to modify later (like sub-lists, or dicts):
l = [{} for x in range(100)]
(The reason why the first method is only a good idea for constant values, like ints or strings, is because only a shallow copy is does when using the <list>*<number> syntax, and thus if you did somet...
Only detect click event on pseudo-element
...s X and Y also relative to the document.
Therefore, I can come up with a range of "clickable" region on the entire page that never changes.
Here's my demo on codepen.
or if too lazy for codepen, here's the JS:
* I only cared about the Y values for my example.
var box = $('.box');
// clicka...
SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'
...d some troubleshooting tips.
In so many words, outside of the 7-bit ASCII range (0x00-0x7F), Python can't and mustn't guess what string a sequence of bytes represents. https://tripleee.github.io/8bit#a3 shows 21 possible interpretations for the byte 0xA3 and that's only from the legacy 8-bit encodi...
How do I revert a Git repository to a previous commit?
...ate revert commits:
git revert a867b4af 25eee4ca 0766c053
# It also takes ranges. This will revert the last two commits:
git revert HEAD~2..HEAD
#Similarly, you can revert a range of commits using commit hashes (non inclusive of first hash):
git revert 0d1d7fc..a867b4a
# Reverting a merge commit
...