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App Inventor 2 数学代码块 · App Inventor 2 中文网
...代码块
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幂运算 ( ^ )
随机整数 (rando...
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...
Detect if value is number in MySQL
...
answered Feb 21 '11 at 10:47
RichardTheKiwiRichardTheKiwi
96.3k2323 gold badges178178 silver badges250250 bronze badges
...
How do I create an empty array/matrix in NumPy?
...rt numpy
&gt;&gt;&gt; a = numpy.zeros(shape=(5,2))
&gt;&gt;&gt; a
array([[ 0., 0.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.]])
&gt;&gt;&gt; a[0] = [1,2]
&gt;&gt;&gt; a[1] = [2,3]
&gt;&gt;&gt; a
array([[ 1., 2.],
[ 2., 3.],
[ 0., 0.],
[ 0., 0.],
[ 0., 0.]])
...
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 ...
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
...
Apply pandas function to column to create multiple new columns?
...,
left_index=True, right_index=True)
textcol feature1 feature2
0 0.772692 1.772692 -0.227308
1 0.857210 1.857210 -0.142790
2 0.065639 1.065639 -0.934361
3 0.819160 1.819160 -0.180840
4 0.088212 1.088212 -0.911788
EDIT:
Please be aware of the huge memory consumption and low sp...
What's the (hidden) cost of Scala's lazy val?
...uivalent to the following Java code:
class LazyTest {
public int bitmap$0;
private String msg;
public String msg() {
if ((bitmap$0 &amp; 1) == 0) {
synchronized (this) {
if ((bitmap$0 &amp; 1) == 0) {
synchronized (this) {
msg = "La...
Obfuscated C Code Contest 2006. Please explain sykes2.c
...&gt;&gt; ";;;====~$::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...