constraints

问题 Maybe someone can help me to solve a problem with Prolog or any constraint programming language. Imagine a table of projects (school projects where pupils do something with their mothers). Each project has one or more children participating. For each child we store its name and the name of its mother. But for each project there is only one cell that contains all mothers and one cell that contains all children. Both cells are not necessarily ordered in the same way. Example: +-----------+-----

问题 I'm creating an ios IPad app that has a UITabBar control positioned at the bottom with 3 MenuItems in it. Normally, when I rotate the device, the tabbar will remain at the bottom in landscape. I'd like to have the TabBar rotate to the left side in Landscape mode, and become a vertical representation. I don't want to create a UIView with buttons if possible, because I'd like the same object to manage both, and I like the convenience of the normal TabBar. My Plan was to detect the device

问题 For fun, I'm creating a program that generates partners for a Secret Santa gift exchange. However, in this setup, instead of randomly generating pairs, constraints are allowed. Example: Person A and Person B hate each other, so neither A nor B should be assigned to buy a gift for the other. Second Example: Person C bought a gift for Person D last year. Person C should not be assigned to buy a gift for Person D, but person D should still be allowed to buy C a gift. In general, I want to

问题 Would be gratefull for some advice on the following - Is it possible to validate email and postcode fields through some kind of check constraint in the sql in oracle ? or this kind of thing as i suspect pl/sql with regular expressions ? Thanks 回答1: If you're only concerned with the US, there are several sources of zip codes that you can obtain in flat-file format and import into a table, and then apply a foreign key constraint in your addresses to that table. Email addresses can be matched

问题 I'm using Gurobi in Python and for a given set S I'm adding the constraint as follows: for i in S: m.addConstr(quicksum(x[i,j] for j in (set(V) - set(S))) >= 2) I want to print these constraints for each value of the sets S and V on the screen. For an example, if S={1,3,4} and V= {1,2,3,4,5,6} , then, my constraint will be x[1,2]+x[1,5]+x[1,6]+x[3,2]+x[3,5]+x[3,6]+x[4,2]+x[4,5]+x[4,6]>=2 I want this constraint to be preinted on the screen. Can someone please help me to do it? 回答1: There is no

问题 We have a table that contains prices that are depending on a base amount. As an example let say that if the base amount is less or equal to 100 then the price is 10 but if the base amount is greater that 100 but less or equal to 1000 then the price is 20 and finally if the base amount is greater than 1000 then the price is 30. A simplified version of our table for this should be something like this: PRICE_CODE START_RANGE END_RANGE PRICE_AMOUNT 100 0,00 100,00 10,00 100 100,01 1000,00 20,00

问题 Made a quick video demonstrating the issue here: https://vid.me/9kB5 When I remove the constraints the text does not jump upon loading the view. But then it defeats the purpose. When I setup the constraints I used "Reset to Suggested Constraints" Any ideas? 回答1: This is not a constraint issue. Your view is going under the navigation bar. You can fix it in storyboard by unchecking "Extend Edges - Under Top Bar" in Page View Controller scene. In code - (void)viewDidLoad { [super viewDidLoad];

问题 I have the following problem : I have rows like ID CODE NAME ......... 1 h1100h1 Cool example1 ......... 2 h654441 Another cool1 ......... I would like to swap them retaining all old primary keys and constraints. Of course, I can easily solve this manually by updating the rows. I am kind of wondering whether anybody has any excellent solution for this kind of problem instead of just executing update command manually. I really really appreciate any suggestions or recommendations. 回答1: I haven

问题 I ' am copying data from table A to table B. Table B has a nullable column that has a default constraint value of 0. In general I set values of columns using the following accessor. public object this[string columnName] { get { return DataTable.Rows[CurrentRow][columnName]; } set { DataTable.Rows[CurrentRow][columnName] = value; } } But I do NOT set my nullable column X. When I insert the whole row, the default value is not used. Instead of 0, NULL was inserted for the nullable column.

问题 I am currently running multiple linear regression on a dataset. At first, I didn't realize I needed to put constraints over my weights; as a matter of fact, I need to have specific positive & negative weights. To be more precise, I am doing a scoring system and this is why some of my variables should have a positive or negative impact on the note. Yet, when running my model, the results do not fit what I am expecting, some of my 'positive' variables get negative coefficients and vice versa.