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How to generate random number with the specific length in python
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189
To get a random 3-digit number:
from random import randint
randint(100, 999) # randint is in...
What does .SD stand for in data.table in R
...his is your data.table:
DT = data.table(x=rep(c("a","b","c"),each=2), y=c(1,3), v=1:6)
setkey(DT, y)
DT
# x y v
# 1: a 1 1
# 2: b 1 3
# 3: c 1 5
# 4: a 3 2
# 5: b 3 4
# 6: c 3 6
Doing this may help you see what .SD is:
DT[ , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1...
make arrayList.toArray() return more specific types
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313
Like this:
List<String> list = new ArrayList<String>();
String[] a = list.toArray...
Creating Multifield Indexes in Mongoose / MongoDB
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194
You call the index method on your Schema object to do that as shown here. For your case it wo...
How do I give text or an image a transparent background using CSS?
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edited Sep 8 '19 at 14:23
community wiki
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What is a 'semantic predicate' in ANTLR?
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170
ANTLR 4
For predicates in ANTLR 4, checkout these stackoverflow Q&A's:
Syntax of semant...
How to concatenate and minify multiple CSS and JavaScript files with Grunt.js (0.3.x)
...runt 0.3.x and has been left for reference. For help with the latest Grunt 1.x release please see my comment below this question.
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Geometric Mean: is there a built-in?
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edited Mar 23 '15 at 17:58
answered Aug 28 '14 at 17:55
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How to draw polygons on an HTML5 canvas?
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165
Create a path with moveTo and lineTo (live demo):
var ctx = canvas.getContext('2d');
ctx.fill...
Error 908: Permission Receive SMS - #5 by Taifun - MIT App Inventor Help - MIT App Inventor Community
... transform-origin: center;
opacity: 0;
r: max(1vw, 11px);
cy: 50%;
filter: saturate(2) opacity(0.85);
}
.dots:first-child {
fill: var(--quaternary);
}
.dots:nth-child(2) {
fill: var(--quaternary);
...