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传感器组件 · App Inventor 2 中文网
...2)在三个维度上近似测量加速度。其组成部分是：
X分量：当手机静止在平坦表面上时为 0，当手机倾斜时为正向右（即左侧抬起），当手机倾斜到右侧时为负向左（即，其右侧尺寸升高）。
Y分量：当手机静止在平...
Undo changes in entity framework entities
...s might be a trivial question but: Since ADO.NET entity framework automatically tracks changes (in generated entities) and therefore keeps the original values, how can I rollback changes made to the entity objects?
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How to upload a file to directory in S3 bucket using boto
...mmand prompt and type aws configure, enter your info and you will automatically connect with boto3. Check boto3.readthedocs.io/en/latest/guide/quickstart.html
– seeiespi
Aug 28 '18 at 21:31
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Why can I access private variables in the copy constructor?
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IMHO, existing answers do a poor job explaining the "Why" of this - focusing too much on reiterating what behaviour's valid. "access modifiers work on class level, and not on object level." - yes, but why?
The overarching concept ...
What is tail call optimization?
...s optimization (JavaScript does also, starting with ES6), so here are two examples of the factorial function in Scheme:
(define (fact x)
(if (= x 0) 1
(* x (fact (- x 1)))))
(define (fact x)
(define (fact-tail x accum)
(if (= x 0) accum
(fact-tail (- x 1) (* x accum))))
(fa...
datatrigger on enum to change image
I've got a button with a fixed background image and would like to show a small overlay image on top of it. Which overlay image to chose depends on a dependency property ( LapCounterPingStatus ) of the according viewmodel.
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.NET: Simplest way to send POST with data and read response
...d reference RFC2616 (w3.org/Protocols/rfc2616/rfc2616.txt). Answers from jball and BFree follow that attempt.
– Chris Hutchinson
Nov 3 '10 at 15:30
9
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What is the smallest possible valid PDF?
Out of simple curiosity, having seen the smallest GIF , what is the smallest possible valid PDF file?
4 Answers
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NumPy or Pandas: Keeping array type as integer while having a NaN value
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This is great! There's a small issue though that PyCharm fails to display the dataframe in the debug window if used this way. You can see my answer for another question for how to force displaying it: stackoverflow.com/questions/38956660/… (the origi...
Is there a generic constructor with parameter constraint in C#?
...neric object, the type still needs the correct constructor declared or an exception will be thrown. You can pass in any argument as long as they match one of the constructors.
Used this way you cannot put a constraint on the constructor in the template.
If the constructor is missing, an exception n...