array

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Consider following code: int main() { int (*p)[]; // pointer to array with unspecified bounds int a[] = {1}; int b[] = {1,2}; p = &a; // works in C but not in C++ p = &b; // works in C but not in C++ return 0; } In pure C you can assign a pointer to this type of address of an array of any dimension. But in C++ you can't. I found one case when compiler allows assign value to such pointer: struct C { static int v[]; }; int main() { int (*p)[] = &C::v; // works in C++ if 'v' isn't defined (only declared) return 0; } But could not find any

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am having trouble initializing a constant array of constant strings. From week.h (showing only relevant parts): class Week { private: static const char *const *days = { "mon", "tue", "wed", "thur", "fri", "sat", "sun" }; }; When I compile I get the error "excess elements in scalar initializer". I tried making it type const char **, thinking I messed up the 2nd const placement, but I got the same error. What am I doing wrong? 回答1: First of all, you need an array, not a pointer. static const char * const days[] = {"mon", "tue", "wed", "thur"

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What am I doing wrong here? Sub Main() Dim patients() As String ' Some code to populate the patients array, works fine CalculateScores (patients) ' Array argument must be ByRef compile error End Sub Sub CalculateScores(patients As String) End Sub If I change patients to a variant array in Main and the parameters of CalculateScores it works fine but I can't see the logic of not being able to pass a string. By default it is ByRef so I know I'm missing something. I can use a variant sure, but it feels hacky. 回答1: When you do this: DoSomething

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: i nead to make a search with full text index and this code work: $cursor=$collection->find(array('$text'=>(array('$search'=>$s))), array("score"=> array('$meta'=>"textScore")) ); i try to sort the cursor with: $cursor =$cursor->sort(array("score"=>1)); when i try to read var_dump($cursor->getNext()); i gave me this error Uncaught exception 'MongoCursorException' with message 'localhost:27017: Can't canonicalize query: BadValue can't have a non-$meta sort on a $meta projection' any idea? 回答1: You are attempting to sort on a meta field, not a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to create a NumPy array/matrix (Nx3) with mixed data types (string, integer, integer). But when I'm appending this matrix by adding some data, I get an error: TypeError: invalid type promotion . Please, can anybody help me to solve this problem? When I create an array with the sample data, NumPy casts all columns in the matrix to the one 'S' data type. And I can't specify data type for an array, because when i do this res = np.array(["TEXT", 1, 1], dtype='S, i4, i4') - I get an error: TypeError: expected a readable buffer object

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The following code looks fine to me: #include <stdio.h> template <typename T> struct A { static float m_kA[]; }; template <typename T> float A<T>::m_kA[] = {1.0f, 2.0f, 3.0f}; int main() { printf("%d\n", sizeof(A<unsigned int>::m_kA) / sizeof(A<unsigned int>::m_kA[0])); return 0; } But when i compile with VC9 i get the following error error C2070: 'float []': illegal sizeof operand I would expect this code to compile. Am i missing something? Does anyone know a way to fix this strange behavior (note that the exact same thing without the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a Document class that stores the data of that document as a byte array. I need to check the size of the array, using LINQ to Entities. I have tried the following: [long Linq query here...] o.Data.Length < 800000) The problem is I get the following exception: The LINQ expression node type 'ArrayLength' is not supported in LINQ to Entities." Is there any other way to check the size of the byte array? 回答1: Use SqlFunctions.DataLength Method (Byte[]) to compare length. yourquery..... SqlFunctions.DataLength(o.Data) < 800000) See: Linq2EF

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: How is this illegal 5 answers int[][][] inputs; inputs = new int[10][][]; inputs[0] = new int[1][]; inputs[0][0] = new int[14]{1,1,-1,-1,-1,1,-1,-1,1,-1,-1,-1,1,1}; This is an excerpt from my program, I have no idea why this is causing an error. Isn't this correct? Thanks in advance :-) 回答1: In Eclipse I get a pretty clear error message: Cannot define dimension expressions when an array initializer is provided. That means that you can either specify the dimension or the array initializer (i.e. the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working on a UDAF that returns an array of elements. The input for each update is a tuple of index and value. What the UDAF does is to sum all the values under the same index. Example: For input(index,value) : (2,1), (3,1), (2,3) should return (0,0,4,1,...,0) The logic works fine, but I have an issue with the update method , my implementation only updates 1 cell for each row , but the last assignment in that method actually copies the entire array - which is redundant and extremely time consuming. This assignment alone is responsible for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In Python, I trained an image classification model with keras to receive input as a [224, 224, 3] array and output a prediction (1 or 0). When I load the save the model and load it into xcode, it states that the input has to be in MLMultiArray format. Is there a way for me to convert a UIImage into MLMultiArray format? Or is there a way for me change my keras model to accept CVPixelBuffer type objects as an input. 回答1: In your Core ML conversion script you can supply the parameter image_input_names='data' where data is the name of your input