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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...able microcontroller and can provide input/output functionality for a wide range of applications. By building out IOIO/MOIO board support for AppInventor, creating a robotics kit and accompanying tutorials, we hope to make hardware programming more accessible.
The Kit
For sensors, the kit includes ...
How to iterate over rows in a DataFrame in Pandas
...n make arbitrarily complex things work through the simplicity and speed of raw Python code.
Caveats
List comprehensions assume that your data is easy to work with - what that means is your data types are consistent and you don't have NaNs, but this cannot always be guaranteed.
The first one is more...
Auto column width in EPPlus
...
Just wanted to point out you can fit cells with out specifying the range, just make sure to call this after you've formatted all columns etc:
worksheet.Cells.AutoFitColumns()
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impro...
jQuery Scroll To bottom of the page
...scrollTop: 9999 }, 'slow');
As simple as this , 9999 page height ... big range so it can reach to bottom .
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Generating UML from C++ code? [closed]
...idn't try Rational Rose, though, since it's well above my acceptable price range.
– Fabio Ceconello
Jan 5 '09 at 22:46
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Version vs build in Xcode
...ame values.
When viewing the Info tab, if you right-click and select Show Raw Keys/Values, you'll see the actual names are CFBundleShortVersionString (Version) and CFBundleVersion (Build).
The Version is usually used how you appear to have been using it with Xcode 3. I'm not sure on what level you...
Quickly find whether a value is present in a C array?
... need to find a hash function that maps your input value to a value in the range 0..n, where there are no collisions for all the valid values you care about. That is, no two "valid" values hash to the same output value. When searching for a good hash function, you aim to:
Keep the hash function rea...
jQuery remove options from select
...#selectedId option').slice(index1,index2).remove()
to remove a especific range of the select options.
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Quickly reading very large tables as dataframes
... currently claims to be "1.5-2x slower" than data.table::fread).
read.csv.raw from iotools provides a third option for quickly reading CSV files.
Trying to store as much data as you can in databases rather than flat files. (As well as being a better permanent storage medium, data is passed to and...
How to find the kth smallest element in the union of two sorted arrays?
...len(a)+len(b)) time.
Assumption: The inputs are correct, i.e., k is in the range [0, len(a)+len(b)].
Base cases:
If length of one of the arrays is 0, the answer is kth element of the second array.
Reduction steps:
If mid index of a + mid index of b is less than k:
If mid element of a is gr...