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How do I calculate a point on a circle’s circumference?
... r * cos(a)
y = cy + r * sin(a)
Where r is the radius, cx,cy the origin, and a the angle.
That's pretty easy to adapt into any language with basic trig functions. Note that most languages will use radians for the angle in trig functions, so rather than cycling through 0..360 degrees, you're cycli...
How to implement a secure REST API with node.js
I start planning a REST API with node.js ,express and mongodb. The API provides data for a website (public and private area) and maybe later a mobile app. The frontend will be developed with AngularJS.
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Kill detached screen session [closed]
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@laffuste 's comment worked for me, but quit and :quit lead to command not found on my remote Linux server (perhaps differences between versions of the OS or screen are to blame)
– Hack-R
Mar 20 '15 at 15:05
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使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，可加参数指定ip、端口，默认本机27017）
config={
"_id" : "ReplSetName",
"members" : [
{"_id" : 0, "host" : "172.16.88.97:27017",priority:2},
{"_id" : 1, "host" : "172.16.88.97:27018",priority:1},
{"_id" : 2, "host" : "172.16.88.97:27019",arbite...
Android View.getDrawingCache returns null, only null
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I was having this problem also and found this answer:
v.setDrawingCacheEnabled(true);
// this is the important code :)
// Without it the view will have a dimension of 0,0 and the bitmap will be null
v.measure(MeasureSpec.makeMeasureSpec(0, Me...
Cannot drop database because it is currently in use
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Someone connected to the database. Try to switch to another database and then, to drop it:
Try
SP_WHO to see who connected
and KILL if needed
share
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improve this answer
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What are the differences between vector and list data types in R?
What are the main differences between vector and list data types in R? What are the advantages or disadvantages of using (or not) these two data types?
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jQuery get specific option tag text
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Thank you for this nickf. Here is this answer expanded if you want to get the value dynamically: var selectValue = document.getElementById('list').value; var selectOption = $("#list option[value=" + selectValue + "]").text(); ///good example nickf.
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Embed YouTube video - Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
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The YouTube URL in src must have and use the embed endpoint instead of watch, so for instance let’s say you want to embed this YouTube video: https://www.youtube.com/watch?v=P6N9782MzFQ (browser's URL).
You should use the embed endpoint, so the URL now sh...
windbg 备忘 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...| 1 s
sx, sxd, sxe, sxi, sxn, sxr, sx- (Set Exceptions)
The sx* commands control the action that the debugger takes when an exception occurs in the application that is being debugged, or when certain events occur.
--引http://www.vcfans.com/2010/04/windbg-study-notes-order.html
Win...