list

问题 I have a List of objects that I'm adding to in nested foreach loops. the operation is synchronous (or maybe I don't understand lambdas as well as I think I do) and single-threaded and the list isn't unreasonably big. I'm at a total loss for what could be causing this exception. public string PromotionSpecificationIdGuid { get; set; } public virtual List<ElementInstance> ElementInstances { get; set; } public void UpdateInstanceGraph(OfferingInstance parentData, OfferingInstance

问题 I have a List of objects that I'm adding to in nested foreach loops. the operation is synchronous (or maybe I don't understand lambdas as well as I think I do) and single-threaded and the list isn't unreasonably big. I'm at a total loss for what could be causing this exception. public string PromotionSpecificationIdGuid { get; set; } public virtual List<ElementInstance> ElementInstances { get; set; } public void UpdateInstanceGraph(OfferingInstance parentData, OfferingInstance

问题 I have a List of objects that I'm adding to in nested foreach loops. the operation is synchronous (or maybe I don't understand lambdas as well as I think I do) and single-threaded and the list isn't unreasonably big. I'm at a total loss for what could be causing this exception. public string PromotionSpecificationIdGuid { get; set; } public virtual List<ElementInstance> ElementInstances { get; set; } public void UpdateInstanceGraph(OfferingInstance parentData, OfferingInstance

问题 I have a List of objects that I'm adding to in nested foreach loops. the operation is synchronous (or maybe I don't understand lambdas as well as I think I do) and single-threaded and the list isn't unreasonably big. I'm at a total loss for what could be causing this exception. public string PromotionSpecificationIdGuid { get; set; } public virtual List<ElementInstance> ElementInstances { get; set; } public void UpdateInstanceGraph(OfferingInstance parentData, OfferingInstance

问题 I'm trying to store all elements in a List in a file for later retrieval so when the program closes that data isn't lost. Is this possible? I've written some code to try, but it's not what I want. This is what I have written so far though. import java.util.*; import java.io.*; public class Launch { public static void main(String[] args) throws IOException { int[] anArray = {5, 16, 13, 1, 72}; List<Integer> aList = new ArrayList(); for (int i = 0; i < anArray.length; i++) { aList.add(anArray[i

问题 I'm trying to store multiple dataframes in a list. However, at some point, the dataframes end up getting converted into lists, and so I end up with a list of lists. All I'm really trying to do is keep all my dataframes together in some sort of structure. Here's the code that fails: all_dframes <- list() # initialise a list that will hold a dataframe as each item for(file in filelist){ # load each file dframe <- read.csv(file) # read CSV file all_dframes[length(all_dframes)+1] <- dframe # add

问题 I'm trying to store multiple dataframes in a list. However, at some point, the dataframes end up getting converted into lists, and so I end up with a list of lists. All I'm really trying to do is keep all my dataframes together in some sort of structure. Here's the code that fails: all_dframes <- list() # initialise a list that will hold a dataframe as each item for(file in filelist){ # load each file dframe <- read.csv(file) # read CSV file all_dframes[length(all_dframes)+1] <- dframe # add

问题 Get the details of a Shipment with the expected date of delivery. Also get the number of shipment status available for that shipment, meaning the number of intermediate traversals. Write a program to compare if the expected date on the final status of the shipment and the actual expected date of the Shipment and display whether the Shipment has arrived 'on time' or 'before' or 'after' the expected date. public class ShipmentMain { public static void main(String[] args) { DateFormat df =

问题 I have created a class to create rectangles and put them in a list . I don't want them to collide so I use collidelist but it isn't working.rectangles are still colliding . I also want rectangles to move down and change x position when hit a specific point , I can do that but I am not sure if it is preventing collidelist from working Look the code below for more clarification. import pygame import random from pygame.locals import * import time pygame.init() a = 255,255,255 b = 0,0,0 c = 80

问题 This post shows how to axiomatise a length function for Z3's built-in lists. However, the function is sort-specific (here Int) and not applicable to lists of bools or custom sorts. ; declare len as an uninterpreted function (declare-fun len ((List Int)) Int) ; assert defining equations for len as an axiom (assert (forall ((xs (List Int))) (ite (= nil xs) (= 0 (len xs)) (= (+ 1 (len (tail xs))) (len xs))))) What would be the smartest way of encoding sort-generic list functions? (If I remember