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Comparing lists with custom conditions


Comparing lists with custom conditions

By : ominouswanderer
Date : November 22 2020, 09:00 AM
Hope this helps Although there are many ways to accomplish this in Prolog, you will likely end up with a four-clause rule, with one clause dedicated to each of the outputs that you are looking to produce:
code :
output(A, B, 0) :- ...
output(A, B, 2) :- ...
output(A, B, 1) :- ...
output(A, B, 4) :- ...
output(A, B, 0) :- length(A, LA), length(B, LB), LA < LB.
length(A, L), length(B, L), ...


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C# Comparing Two Custom Lists

C# Comparing Two Custom Lists


By : Prince Arora
Date : March 29 2020, 07:55 AM
I hope this helps you . I have run into a situation where I need to compare two different lists to each other and I am wondering what the best method is for doing this? I thought something like this would work but it doesn't and I can't figure out why. The Linq query is returning records it shouldn't. This is my first run at trying to figure something like this out so it is undoubtedly messy. , Can't you use Enumerable.Except ?
code :
public static IEnumerable<TSource> Except<TSource>(
    this IEnumerable<TSource> first,
    IEnumerable<TSource> second
)
using System;
using System.Linq;
using System.Collections.Generic;

class ColumnDefinition : IEquatable<ColumnDefinition>
{
    public string Name { get; set; }
    public string Type { get; set; }
    public string Attr { get; set; }

    public ColumnDefinition()
    {
        Name = string.Empty;
        Type = string.Empty;
        Attr = string.Empty;
    }

    public bool Equals(ColumnDefinition other)
    {   
        return Name.Equals(other.Name) && Type.Equals(other.Type) && Attr.Equals(other.Attr);
    }

    public override bool Equals(object value)
    {
        return (value is ColumnDefinition) ? Equals(value as ColumnDefinition) : false;
    }

    public override int GetHashCode()
    {
        return Name.GetHashCode() ^ Type.GetHashCode() ^ Attr.GetHashCode();
    }

    public override string ToString()
    {
        return string.Concat("{", Name, ":", Type, ":", Attr, "}");
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        try
        {
            MyMain(args);
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
        finally
        {
            Console.ReadKey();
        }
    }

    public static void MyMain(string[] args)
    {
        var list1 = new []  
            { 
                new ColumnDefinition { Name = "foo", Type = "int", Attr = "0" }, 
                new ColumnDefinition { Name = "bar", Type = "int", Attr = "1" }, 
            };

        var list2 = new [] 
            { 
                new ColumnDefinition { Name = "foo", Type = "int", Attr = "0" }, 
                new ColumnDefinition { Name = "bar", Type = "string", Attr = "1" }, 
            };

        foreach (var changed in Enumerable.Except(list1, list2))
        {
            Console.WriteLine(changed);
        }
    }
}
Comparing two lists with multiple conditions in Entity Framework

Comparing two lists with multiple conditions in Entity Framework


By : Dan Golan
Date : March 29 2020, 07:55 AM
Does that help It looks like your code should work, but perhaps for clarity it could be restructured using query syntax:
code :
var fb =
    (from m in db.Members
     let friendIds = 
         from ff db.FacebookFriends
         where ff.UserID == CurrentUserID
         select ff.FacebookId
     let followerIds = 
         from uf db.UserFollowers
         select uf.FollowerID
     where friendIds.Contains(m.ProviderUserId) && !followerIds.Contains(m.UserID)
     select m)
    .Take(6)
    .ToList();
Comparing Lists under multiple conditions

Comparing Lists under multiple conditions


By : Matej Stieranka
Date : March 29 2020, 07:55 AM
seems to work fine Sure - you're just trying to join on a compound key, which is usually accomplished with an anonymous type:
code :
var query2 = from e in existingThresholds
             join d in defaultThresholdson 
             on new { e.ThresholdType, e.ManufacturerID } equals 
                new { d.ThresholdType, d.ManufacturerID }
             select e;
Efficient way to create new column based on nested if else conditions and comparing values from lists in R

Efficient way to create new column based on nested if else conditions and comparing values from lists in R


By : user2613730
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can get rid of the nested loops, but there will still be a lot of code to write. The cleanest way, in my opinion, is to write a custom function that defines how the logic is applied:
code :
library(tidyverse)

check_col_validity <- function(col, name) {
  r_error <- rep(NA, length(col))

  # is required?
  if (required_list[name] == 1) {
    msg <- paste(toupper(name), "is required")
    r_error <- ifelse(is.na(col), msg, NA)
  }

  # is continuous?
  if (col_type_list[name] == "continuous") {
    msg <- paste(toupper(name), "must be positive")
    new_error <- ifelse(col < 0 | is.na(col), msg, NA)
    error <- ifelse(is.na(r_error), new_error, paste(r_error, new_error, sep = " & "))
  }

  # is in valid range?
  if (col_type_list[name] == "factor") {
    valid_range <- valid_values[[name]]
    msg <- paste(toupper(name), "must be one of", paste(valid_range, collapse = ", "))
    new_error <- ifelse(col %in% valid_range, NA, msg)
    error <- ifelse(is.na(r_error), new_error, r_error)
  }

  return(error)
}
dt$error <- dt[, 1:5] %>%
  purrr::imap_dfc(check_col_validity) %>%
  t() %>%
  as_tibble() %>%
  purrr::map_chr(paste, collapse = " & ") %>%
  stringr::str_remove_all("NA & ") %>%
  stringr::str_remove_all(" & NA")
Comparing two lists with multiple conditions

Comparing two lists with multiple conditions


By : Alejandro Rodriguez
Date : March 29 2020, 07:55 AM
This might help you I have two different lists of same type. I wanted to compare both lists and need to get the values which are not matched. List of class: , Here is solution :
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