constraints

问题 New to Flutter and can't figure out how to put size constraints on my UI so nothing overflows. Trying to make a little bit different UI with tabs, where I have some components above the tab bar. Basically I want something like this: -------------------- | Container | -------------------- | TabBar | -------------------- | | | | | TabBarView | | | | | -------------------- | Container | -------------------- The problem is, I have no idea how to make the TabBarView take up the remaining space. My

问题 It is possible to attach informations (like ints) to points before adding them up to the triangulator object. I do this since I need on the one hand an int-flag that I use lateron to define my texture coordinates and on the other hand an index which I use so that I can create a indexed VBO. http://doc.cgal.org/latest/Triangulation_2/Triangulation_2_2info_insert_with_pair_iterator_2_8cpp-example.html But instead of points I only want to insert constraint-edges. If I insert both CGAL returns

问题 Can anyone show me how to declare an inList constraint within a Grails controller? Let’s say I have this class: class A { List hello } How can I add the inList constraint for the hello List from within the controller? 回答1: Define a constraint in which a List property has values validated against a list of lists? Sounds weird. But you can do it. With this class: class A { List hello static constraint = { hello inList:[['abc','def','ghi'],[1,2,3],['a','b']] } } you can do this in your

问题 I have a curve with a disturbance in the middle (at t=9) which causes a downturn (t<9) and an upturn (t>9) in my data. I would like to fit an exponential function and add a constraint that the area of the two (downturn and upturn) are equal. See figure: I can fit the curve using optim, but I can't figure out the constraint. This should be something like: where f(x) is the exponential function. I've tried constrOptim, but I am open to using other solvers as well. y <-c(170, 160, 145, 127, 117,

问题 there is a way to insert syntactic constraints in weka algorithm priori? For example, I be interested only in rules that have a specific item I(x) appearing in the consequent, or rules that have a specific item I(y) appearing in the antecedent, or combinations of the above constraints. 回答1: You can mine rules with a specific item "I" (what I(x) means in your notation?) appearing in the consequent. For this you need to set the corresponding column "I" as "class variable", that is to make it

问题 I'm trying to create some functions to work with the following type. The following code uses the singletons and constraints libraries on GHC-8.4.1: {-# LANGUAGE ConstraintKinds #-} {-# LANGUAGE DataKinds #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE GADTs #-} {-# LANGUAGE KindSignatures #-} {-# LANGUAGE PolyKinds #-} {-# LANGUAGE RankNTypes #-} {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE TypeApplications #-} {-# LANGUAGE TypeFamilies #-} {-#

问题 I have to show the Name and EmailID aligned horizontally properly with the Profile Image . So that the Name and email ID appears exactlybat the center of the UIImageView. But you can see the name and email id are not in centre with the profile image. Why is this happening? I have given the following constraints: 回答1: Remove leading and trailing Constrain and set align center x to imageView. You can also set leading and trailing Constrain. but both are equal as follow. 回答2: Just control+drag

问题 How can I find the name of a named not-null constraint in SQL Server? I can find check constraints, default constraints, FK constraints, PK constraints and unique constraints, but the NN constraint has eluded me. 回答1: You can't. Whilst the syntax does accept a name... CREATE TABLE T ( C INT CONSTRAINT NN NOT NULL ) ... and it is parsed and validated as a name ... CREATE TABLE T ( C INT CONSTRAINT

问题 I am trying to use differential evolution to optimize availability based on cost. However, I have three unknown parameters (a, b, c) here and I can define the range using bounds. However, I want to define additional constraint as a+b+c <= 10000. I am using python to do this and I tried to use an option "args" within differential evolution but it did not work. Any information will be appreciated. 回答1: Here is a hack. I used the last example from the documentation and constrained the sum(x) > 4

问题 I want to have an extension method for XElement/XAttribute that allows me to apply a "ValueOrDefault" logic - perhaps with various slightly different implementations: ValueOrNull, ValueOrDefault, NumericValueOrDefault (which validates if the value is numeric), but I want to constrain these methods so that they can only work with ValueTypes or String (i.e. it does not really make sense to use any other reference types. Is it possible to do this with one implementation of each method, or will I