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How do I create an empty array/matrix in NumPy?
...rt numpy
>>> a = numpy.zeros(shape=(5,2))
>>> a
array([[ 0., 0.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.]])
>>> a[0] = [1,2]
>>> a[1] = [2,3]
>>> a
array([[ 1., 2.],
[ 2., 3.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.]])
...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...代码块
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乘 ( * )
除 ( / )
幂运算 ( ^ )
随机整数 (rando...
Detect if value is number in MySQL
...
answered Feb 21 '11 at 10:47
RichardTheKiwiRichardTheKiwi
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...
How to create the most compact mapping n → isprime(n) up to a limit N?
...ent every odd number with one bit e.g. for the given range of numbers (1, 10], starts at 3: 1110
31 Answers
...
The $.param( ) inverse function in JavaScript / jQuery
...eparam
– Felipe Castro
Jan 8 '13 at 0:52
2
Unfortunately the github page hasn't seen any updates ...
Could not load file or assembly 'Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=3
...
240
In package manager console execute: Update-Package –reinstall Newtonsoft.Json.
UPDATE
I orig...
Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space
...
Be aware, that \W leaves the underscore. A short equivalent for [^a-zA-Z0-9] would be [\W_]
text.replace(/[\W_]+/g," ");
\W is the negation of shorthand \w for [A-Za-z0-9_] word characters (including the underscore)
Example at regex101.com
...
Obfuscated C Code Contest 2006. Please explain sykes2.c
...&gt;&gt; ";;;====~$::199"[_*2&amp;8|_/64]/(_&amp;2?1:8)%8&amp;1
: 10);
}
Introducing variables to untangle this mess:
main(int i) {
if(i^448)
main(-~i);
if(--i % 64) {
char a = -~7[__TIME__-i/8%8]["&gt;'txiZ^(~z?"-48];
char b = a &gt;&gt; ";;;====~$::199"[i...
Moving decimal places over in a double
...
190
If you use double or float, you should use rounding or expect to see some rounding errors. If yo...
Split (explode) pandas dataframe string entry to separate rows
... for _, row in a.iterrows()]).reset_index()
Out[55]:
index 0
0 a 1
1 b 1
2 c 1
3 d 2
4 e 2
5 f 2
Then you just have to rename the columns
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