function

问题 def make_Ab(A,b): n = len(A) Ab = list(A) for index in range(0,n): Ab[index].append(b[index][0]) print(A) return Ab.copy() A = [[0.0, 1.0, 1.0, 2.0], [1.0, 3.0, 1.0, 5.0], [2.0, 0.0, 2.0, 4.0]] b = [[1],[2],[3]] print(A) [[0.0, 1.0, 1.0, 2.0], [1.0, 3.0, 1.0, 5.0], [2.0, 0.0, 2.0, 4.0]] Ab = make_Ab(A,b) print(A) [[0.0, 1.0, 1.0, 2.0, 1], [1.0, 3.0, 1.0, 5.0, 2], [2.0, 0.0, 2.0, 4.0, 3]] I don't get why does my function modify my original list. I didn't specify A as global in function (I've

问题 This question already has answers here : Normal arguments vs. keyword arguments (10 answers) Closed 6 years ago . This is an example of of code from here: What does the equality mean in the argument assignment to function? like N=20000 here? What is the difference between that and simply N as argument? import random,math def gibbs(N=20000,thin=500): x=0 y=0 samples = [] for i in range(N): for j in range(thin): x=random.gammavariate(3,1.0/(y*y+4)) y=random.gauss(1.0/(x+1),1.0/math.sqrt(x+1))

问题 So I am confused as to when I would use an anonymous function such as: let foo = function () { //code } versus a named anonymous function such as: let foo = function foo () { //code } Besides browser support, namely IE, are there any differences between the two? When should I use one over the other? 回答1: In this case, where the function declaration name is the same as the variable it is assigned to, it doesn't make much difference. If you used a different name for the definition and

问题 I'm just curious, how can I call a custom function after document.getElementById()? Something like this: document.getElementById("element").mycustomfunction(); 回答1: Technically you can do this : Element.prototype.mycustomfunction = function() { console.log("I don't work on IE7"); }; You can test it easily in your console on this page : type it first and then document.getElementById("notify-container").mycustomfunction(); . It works. There's not technical problem with it. But it might make it

问题 I'm just curious, how can I call a custom function after document.getElementById()? Something like this: document.getElementById("element").mycustomfunction(); 回答1: Technically you can do this : Element.prototype.mycustomfunction = function() { console.log("I don't work on IE7"); }; You can test it easily in your console on this page : type it first and then document.getElementById("notify-container").mycustomfunction(); . It works. There's not technical problem with it. But it might make it

问题 I'm just curious, how can I call a custom function after document.getElementById()? Something like this: document.getElementById("element").mycustomfunction(); 回答1: Technically you can do this : Element.prototype.mycustomfunction = function() { console.log("I don't work on IE7"); }; You can test it easily in your console on this page : type it first and then document.getElementById("notify-container").mycustomfunction(); . It works. There's not technical problem with it. But it might make it

问题 I have a list of 12 dataframes. the name of the list is kvish_1_10t.tables . each data frame has a column "day_mean" (always the 7's column in all the dataframes). its impotant to say that all the dataframes look exacly the same. this is an example of one of the tables: X2014_kvish_1_10t kvish keta maslul yom nefah date day_mean 1 1 10 1 1 1936 2014-09-07 00:00:00 2910.958 2 1 10 1 1 966 2014-09-07 01:00:00 2910.958 3 1 10 1 1 737 2014-09-07 02:00:00 2910.958 4 1 10 1 1 596 2014-09-07 03:00

问题 Suppose we have a composite type: mutable struct MyType{TF<:AbstractFloat, TI<:Integer} a::TF b::TF end We define a constructor function MyType(a; b = 1.0) return MyType(a, b) end I can broadcast MyType over an array of a 's, but how can I do that for b 's? I tried to do MyType.([1.0, 2.0, 3.0]; [:b, 1.0, :b, 2.0, :b, 3.0,]) But, this does not work. Note that the above example is totally artificial. In reality, I have a composite type that takes in many fields, many of which are constructed

问题 Trying to return value from function create or replace function compairenumber(num1 in number,num2 in number) return boolean is begin if num1 < num2 then return true; else return false; end if; end; when i'm giving query select compairenumber(5,10) from dual its not returning true or false. 回答1: Boolean values can only be used in other PL/SQL code, not in Oracle SQL. If you want a function whose return value is available in a select ... from dual then you will need to define the function to

问题 I'm wanting to pass an array into a function. From what I can see, there are 2 ways of doing this: 1. void f (int array[]) { // Taking an array with square brackets } 2. void f (int *array) { // Taking a pointer } Each one is called by: int array[] = {0, 1, 2, 3, 4, 5}; f (array); Is there any actual difference between these 2 approaches? 回答1: In your specific example there is no difference. In more general case one difference between these two approaches stems from the fact that in case of [