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: What is the concept when we define a global array with no dimension This shows output as 16. #include #include int arr[]; int main(int argc, char *argv[]) { arr[1] = 16; printf("%d\n",arr[1]); system("PAUSE"); return 0; } And even sizeof(arr) doesn't work. Why? 回答1: int arr[]; is a tentative definition there. Clause 6.9.2, paragraph 2 says: A declaration of an identifier for an object that has file scope without an initializer, and without a storage-class specifier or with the storage-class specifier static, constitutes a tentative

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): 由 翻译 强力驱动 问题: I want to encode 3 categorical features out of 10 features in my datasets. I use preprocessing from sklearn.preprocessing to do so as the following: from sklearn import preprocessing cat_features = [ 'color' , 'director_name' , 'actor_2_name' ] enc = preprocessing . OneHotEncoder ( categorical_features = cat_features ) enc . fit ( dataset . values ) However, I couldn't proceed as I am getting this error: array = np . array ( array , dtype = dtype , order = order , copy = copy ) ValueError : could not convert string to float : PG I

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: Why is [] !== [] in JavaScript? I read through https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness but I could not find anything that explains this. Edit: I don't think this question is an exact duplicate of mine. It asks about the == operator which just behaves crazy. The answer is an answer to my question but it's not the same question. 回答1: That does a reference check on the two array literals to see if they are the same instance. The fact that you have two literals means that you are constructing two

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: journeypost=# INSERT INTO user_data.user_data (username,randomint) VALUES ('mahman',1); ERROR: array value must start with "{" or dimension information LINE 1: ... user_data.user_data (username,randomint) VALUES ('mahman... journeypost=# INSERT INTO user_data.user_data (username,randomint) VALUES {'mahman',1}; ERROR: syntax error at or near "{" LINE 1: ...O user_data.user_data (username,randomint) VALUES {'mahman',... journeypost=# INSERT INTO user_data.user_data (username,randomint) VALUES (2,{'mahman',1}); ERROR: syntax error at or near "{

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: Spending my time on high level languages it suddenly occurred to me that I did not know the difference between a Char Array and a String. I think they are the same thing but not sure. Is there a difference? Is it just a Char Array with some abstraction? 回答1: a character array is simply an array of characters a string is data structure that uses an array of characters some string representations use a null-terminator (like C), others use a length prefix 回答2: A String is an abstraction, but of a sequence of characters. It says nothing of

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): 由 翻译 强力驱动 问题: Blocks are fine but what about writing C arrays? Given this simplified situation: CGPoint points [ 10 ]; [ myArray forEachElementWithBlock :^( int idx ) { points [ idx ] = CGPointMake ( 10 , 20 ); // error here // Cannot refer to declaration with an array type inside block }]; after searching a while found this possible solution, to put it in a struct: __block struct { CGPoint points [ 100 ]; } pointStruct ; [ myArray forEachElementWithBlock :^( int idx ) { pointStruct . points [ idx ] = CGPointMake ( 10 , 20 ); }]; this would work

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 want to remove NULL , FALSE and '' values . I used array_filter but it removes the 0 ' s also. Is there anty function to do what I want? array(NULL,FALSE,'',0,1) -> array(0,1) 回答1: array_filter should work fine if you use the identical comparison operator . here's an example $values = [NULL, FALSE, '', 0, 1]; function myFilter($var){ return ($var !== NULL && $var !== FALSE && $var !== ''); } $res = array_filter($values, 'myFilter'); Or if you don't want to define a filtering function, you can also use an anonymous function (closure): $res

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: how to create an array to numpy array? def test(X, N): [n,T] = X.shape print "n : ", n print "T : ", T if __name__=="__main__": X = [[[-9.035250067710876], [7.453250169754028], [33.34074878692627]], [[-6.63700008392334], [5.132999956607819], [31.66075038909912]], [[-5.1272499561309814], [8.251499891281128], [30.925999641418457]]] N = 200 test(X, N) I am getting error as AttributeError: 'list' object has no attribute 'shape' So, I think I need to convert my X to numpy array? 回答1: Use numpy.array to use shape attribute. >>> import numpy as np

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 is perfect valid, int *ia = (int[]){1,3,5,7}; but when I compile the next line of code, char *p = (char[]) "abc"; gcc says test.c:87: error: cast specifies array type It seems they are casted in the same way. Why did the second one get an err msg? As you guys said, "abc" is a pointer, which cannot be converted to be a pointer. So my another question: why does char[] s = "abc"; is valid. How does the above line of code work when compiling? 回答1: This is valid because the expression on the right hand side is a C99 compound

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 question. I am a newbie with Run Time Type Information from Delphi 2010. I need to set length to a dynamic array into a TValue. You can see the code. Type TMyArray = array of integer; TMyClass = class publihed function Do:TMyArray; end; function TMyClass.Do:TMyArray; begin SetLength(Result,5); for i:=0 to 4 Result[i]=3; end; ....... ....... ...... y:TValue; Param:array of TValue; ......... y=Methods[i].Invoke(Obj,Param);//delphi give me a DynArray type kind, is working, Param works to any functions. if Method[i].ReturnType.TypeKind