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物联网入门 · App Inventor 2 中文网
...背光颜色
在 当 ListPickerBackgroundColor.选择完成时 中，用 Selection 做 if / else if 判断，对八种颜色分别调用 SetBackgroundColor。
7. 测试 RGB LCD
发送文字，再选择不同背景颜色。LCD 应显示文字并改变背光颜色。
温度传感器
1. 接线...
How do you convert a byte array to a hexadecimal string, and vice versa?
... }
return result;
}
static uint[] _Lookup32 = Enumerable.Range(0, 255).Select(i => {
string s = i.ToString("X2");
return ((uint)s[0]) + ((uint)s[1] << 16);
}).ToArray();
static string ByteArrayToHexViaLookupPerByte(byte[] bytes) {
var result = new char[bytes.Length * 2];
...
How to find the kth smallest element in the union of two sorted arrays?
...ithmic. (Here we are getting rid of half). In order to do that, we need to select one array whose one of the halves we can safely ignore. How do we do that? By confidently eliminating the half we know for sure is not going to have the kth element.
– lambdapilgrim
...
How to implement a rule engine?
..."Contains", "C#" )
};
// compile the rules once
var compiledRules = rules.Select(r => CompileRule(r)).ToList();
public bool MatchesAllRules(User user)
{
return compiledRules.All(rule => rule(user));
}
Here is the implementation of BuildExpr:
Expression BuildExpr(Rule r, ParameterExpress...
Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?
...
FYI: g++ has __attribute__ syntax for selectively 'export' symbols: #define DLLEXPORT __attribute__ ((visibility("default"))) #define DLLLOCAL __attribute__ ((visibility("hidden")))
– Brian Cannard
Jul 10 '14 at 14:49
...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...Us can probably apply several optimization approaches in parallel and then select the one at the end that provides the best speedup. The extra instructions may be biasing the CPU to use one optimization path that is better than others.
The effect of the extra instructions probably depends on the C...
What are the most widely used C++ vector/matrix math/linear algebra libraries, and their cost and be
...s criteria, but if maturity were the only metric, I imagine you would have selected a BLAS or LAPACK based option.
– Catskul
Sep 9 '09 at 17:54
...
What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
...eems a bit backwards. I would expect the problem do be when std::swap() is selected rather than the overload specific to the type, A::swap(). The example with std::swap(A::MyClass&, A::MyClass&) seems misleading. since std would never have a specific overload for a user type, I don't think i...
multi-layer perceptron (MLP) architecture: criteria for choosing number of hidden layers and size of
...
To automate the selection of the best number of layers and best number of neurons for each of the layers, you can use genetic optimization.
The key pieces would be:
Chromosome: Vector that defines how many units in each hidden layer (e.g....
Download a file with Android, and showing the progress in a ProgressDialog
...ime (12 AM for instance), the service will download all the link that user selected before. I mean the service I need has to be able to queue download links, and then download all of them (one by one or parallel, depend on user). Thank you
– Hoang Trinh