user-defined

问题 I am writing a code where I need to arrays defined as u1,u2,u3. I require that number of variables defined are dictated by the user. for example if the user enters an integer value of "7". Then the variables defined are u1,u2,u3,u4,u5,u6,u7. So the variable names for the arrays are being defined by what value the user enters. 回答1: From the description of your problem, you simply want an allocatable array. TYPE(whatever), ALLOCATABLE :: u(:) INTEGER :: some_number PRINT *, 'Enter the number of

问题 I am writing a code where I need to arrays defined as u1,u2,u3. I require that number of variables defined are dictated by the user. for example if the user enters an integer value of "7". Then the variables defined are u1,u2,u3,u4,u5,u6,u7. So the variable names for the arrays are being defined by what value the user enters. 回答1: From the description of your problem, you simply want an allocatable array. TYPE(whatever), ALLOCATABLE :: u(:) INTEGER :: some_number PRINT *, 'Enter the number of

问题 It is easy to introduce new infix operators in C++ // User-defined infix operator framework template <typename LeftOperand, typename Operation> struct LeftHelper { const LeftOperand& leftOperand; const Operation& operation; LeftHelper(const LeftOperand& leftOperand, const Operation& operation) : leftOperand(leftOperand), operation(operation) {} }; template <typename LeftOperand, typename Operation > auto operator < (const LeftOperand& leftOperand, Operation& operation) { return LeftHelper

来源： https://stackoverflow.com/questions/63659406/user-defined-function-sorting-column-problem

来源： https://stackoverflow.com/questions/63659406/user-defined-function-sorting-column-problem

来源： https://stackoverflow.com/questions/63659406/user-defined-function-sorting-column-problem

问题 I would like to use EclipseLink as my JPA engine. We are using a subclass of java.sql.Connection and I would like to know if I can force EclipseLink to use my connection. I would like to set the connection object programmatically. Something like MyConnection conn = new MyConnection(JDBC_URL, USR, PWD); EntityManagerFactory factory = Persistence.createEntityManagerFactory(conn); 回答1: You can set a custom connection programatically using the following code: Map properties = new HashMap(); //

问题 I would like to use EclipseLink as my JPA engine. We are using a subclass of java.sql.Connection and I would like to know if I can force EclipseLink to use my connection. I would like to set the connection object programmatically. Something like MyConnection conn = new MyConnection(JDBC_URL, USR, PWD); EntityManagerFactory factory = Persistence.createEntityManagerFactory(conn); 回答1: You can set a custom connection programatically using the following code: Map properties = new HashMap(); //

问题 Recently I encountered the following problem in my R code. In a function, accepting a data frame as an argument, I needed to add (or replace, if it exists) a column with data calculated based on values of the data frame's original column. I wrote the code, but the testing revealed that data frame extract/replace operations , which I've used, resulted in a loss of the object's special (user-defined) attributes . After realizing that and confirming that behavior by reading R documentation (http

问题 Class point is defined as (there are also some methods, atributes, and stuff in it, but this is minimal part): class point(): def ___init___(self, x, y): self.x = x self.y = y So, I saw this question, but when I tried applying it, it returns an error: G = nx.Graph() p = point(0,0) G.add_node(0, p) NetworkXError: The attr_dict argument must be a dictionary. If i use G = nx.Graph() p = point(0,0) G.add_node(0, data = p) I don't get an error, but when i try to access the x-coordinate, it turns