computer-science

Initialization vs assignment

由 拜拜、爱过 提交于 2019-12-02 12:09:45
问题 The terms "initialization" and "assignment" seem to be used interchangeably. I did some searching and it seems that there might technically be a difference. My understanding is that, in the context of variables, a variable is initialized when the JavaScript engine makes it available for use, and assignment (whether done explicitly [as in let foo = 1; ] or by the JavaScript engine, as in the following example) is one way to achieve this. let foo; console.log(foo); // undefined (initialization

Dividing and multiplying Decimal objects in Python

由 假如想象 提交于 2019-12-02 10:10:00
In the following code, both coeff1 and coeff2 are Decimal objects. When i check their type using type(coeff1), i get (class 'decimal.Decimal') but when i made a test code and checked decimal objects i get decimal. Decimal, without the word class coeff1 = system[i].normal_vector.coordinates[i] coeff2 = system[m].normal_vector.coordinates[i] x = coeff2/coeff1 print(type(x)) system.xrow_add_to_row(x,i,m) another issue is when i change the first input to the function xrow_add_to_row to negative x: system.xrow_add_to_row(-x,i,m) I get invalid operation error at a line that is above the changed code

Size of a graph using adjacency list versus adjacency matrix?

由 本小妞迷上赌 提交于 2019-12-02 08:42:48
问题 Suppose there are 2 36 web pages and on average each web page has 2 4 hyperlinks. Consider the directed graph with one vertex per web page and an edge between two vertices if there is a hyperlink between the web pages the vertices represent. How many terabytes would it take to represent the graph using an adjacency matrix? Using an adjacency list? My question is what would be the main difference between the list and the matrix? 回答1: To answer your question, "What is the main difference

Is there a good python library that can turn numbers into their respective “symbols”? [closed]

由 只谈情不闲聊 提交于 2019-12-02 08:27:38
0 = 0 1 = 1 ... 9 = 9 10 = a 11 = b ... 35 = z 36 = A 37 = B ... 60 = Z 61 = 10 62 = 11 ... 70 = 19 71 = 1a 72 = 1b I don't know what this is called. Base something? All I want is a function that can convert the numbers into these, and these back to numbers. Is there an easy function that can do this? You may inherit numbers.Number: def baseN(base,alphabet='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'): class _baseN(numbers.Number): digits=alphabet[:base] def __init__(self,value): if isinstance(value,int): self.value=value if self.value==0: self.string='0' else: tmp=[abs

Size of a graph using adjacency list versus adjacency matrix?

由 纵然是瞬间 提交于 2019-12-02 08:07:56
Suppose there are 2 36 web pages and on average each web page has 2 4 hyperlinks. Consider the directed graph with one vertex per web page and an edge between two vertices if there is a hyperlink between the web pages the vertices represent. How many terabytes would it take to represent the graph using an adjacency matrix? Using an adjacency list? My question is what would be the main difference between the list and the matrix? To answer your question, "What is the main difference between a list representation and matrix representation of a matrix?" A list representation of a graph is usually

ASP.net PageMethods return undefined

由 旧街凉风 提交于 2019-12-02 06:08:45
Hi everyone i trying to get data from cs to js using ToolkitScriptManager. this is my aspx : <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="../assets/lib/jquery/jquery-2.0.3.js" type="text/javascript"></script> <script> $(window).load(function () { alert(PageMethods.isConnected()); }); </script> </head> <body> <form id="form1" runat="server"> <asp:ToolkitScriptManager runat="Server" EnablePageMethods="true" EnablePartialRendering="true" /> <div> </div> </form> </body> </html> and this is my code behind [ScriptMethod, WebMethod] public static bool

Initialization vs assignment

由 无人久伴 提交于 2019-12-02 04:23:56
The terms "initialization" and "assignment" seem to be used interchangeably. I did some searching and it seems that there might technically be a difference. My understanding is that, in the context of variables, a variable is initialized when the JavaScript engine makes it available for use, and assignment (whether done explicitly [as in let foo = 1; ] or by the JavaScript engine, as in the following example) is one way to achieve this. let foo; console.log(foo); // undefined (initialization and assignment?) Is my understanding correct? Also (if so), what actually occurs during initialization

How to run Athena | Coq | Isabelle codes remotely?

由 帅比萌擦擦* 提交于 2019-12-02 03:04:26
问题 I' ve been creating a Web IDE (WIDE) for theorem proving in Computer Science. You may know, there are 3 most common proof assitants which names Athena, Isabelle and Coq. Most of computer scientist might forget their syntax, scopes etc. My Web IDE works with drag and drop desing and examples. You can edit and write additional code on it, you can download it, you can share it, you can save it etc. It has also own parser. So far everything is OK. Watch out! Here is my question: How can I run the

Shortest path in a maze with health loss

由 你。 提交于 2019-12-02 02:41:49
Suppose you have a dungeon, represented by a 2D matrix. You have a start point S (x1,y1) and an end point E (x2, y2). Along the way, some cells have a number in them, which subtract from your health score. Other cells are obstacles that you can't go through. You start with 5 health points, and you need to find the shortest path from S to E where you don't die on the way. I know that Dijikstra is used to find shortest paths. But in this case the shortest path might be one in which you die along the way. How do you find the shortest path where you don't die? Note that there is no advantage to

How to run Athena | Coq | Isabelle codes remotely?

由 青春壹個敷衍的年華 提交于 2019-12-02 01:20:58
I' ve been creating a Web IDE (WIDE) for theorem proving in Computer Science. You may know, there are 3 most common proof assitants which names Athena, Isabelle and Coq. Most of computer scientist might forget their syntax, scopes etc. My Web IDE works with drag and drop desing and examples. You can edit and write additional code on it, you can download it, you can share it, you can save it etc. It has also own parser. So far everything is OK. Watch out! Here is my question: How can I run the users' codes and get the result (especially for Athena http://proofcentral.org/ ) when user would like
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