expression

问题 I am trying to set expressions as x-axis text in facet environment in ggplot2 with unequal length of labels. For example: dat <- structure(list(Species = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L), .Label = c("A", "B"), class = "factor"), Individual = structure(c(1L, 2L, 3L, 5L, 1L, 2L, 3L, 4L, 5L), .Label = c("1", "2", "3", "4", "expression(bar(\"x\"))"), class = "factor"), mean = c(45, 32, 100, 59, 65, 110, 87, 93, 88.75), min = c(34, 20, 89, 47.66666667, 54, 100, 67, 85, 76.5), max =

问题 I've been trying to learn more about using Lamba expression trees and so I created a simple example. Here is the code, this works in LINQPad if pasted in as a C# program. void Main() { IEnumerable<User> list = GetUsers().Where(NameContains("a")); list.Dump("Users"); } // Methods public IEnumerable<User> GetUsers() { yield return new User{Name = "andrew"}; yield return new User{Name = "rob"}; yield return new User{Name = "chris"}; yield return new User{Name = "ryan"}; } public Expression<Func

问题 Hopefully this is quite simple. I want to use the CSS calc operation to perform two calculations: I want to set my width to the equivalent of (100% / 7) - 2 However if I try to perform more than one operation in a CSS calc operation, it fails: width: calc((100% / 7) - 2); How can I perform multiple calc operations in one CSS statement? 回答1: Apparently you have to assign px or % to all numbers that are not being multiplied or divided. width: calc((100% / 7) - 2px); Well I feel dumb now. Haha.

问题 The problem I need to solve is to run data through IF statements. The IF statements are generated by a SQL table on run time. I've managed to do this by using expressions and Lambda expressions. My table has memberName; Operator; Target. So for example I get "Age", "GreaterThan" and "40" from the table, and I compile it. var rule = new Rule(rowRule["memberName"].ToString(), rowRule["Operator"].ToString(), rowRule["Target"].ToString()); Func<User, bool> compiledRule = CompileRule<User>(rule);

问题 What I'm trying to achieve is basically local translation in Maya attached to wheels for example: Moving a car forward in it's LOCAL Z direction and the wheel would spin the same speed no matter what rotation is applied, I've got close, this is what I've done! Connected the parentInverseMatrix and the worldInverseMatrix of the driver into a multMatrix node. Connected the output of the multMatrix node into a decompose matrix node. Connected the outputTranslateZ from the decompose Matrix node

问题 In the data entry form frmlastweeksactivities . When a row has "Gold"or "Silver" or "Bronze" as content in the [“category of activity “] field /column then disable columns/fields[5] & [6] When a row has "Wood" or "Hay"or "Stubble "as content in the [“category of activity “] field /column then disable columns/fields[8] & [9] Disable means not allow any data entry in this case turn them red as well would be nice I am trying to build and expression to use in either the table validation rule

问题 If I have the following JSON [ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "category": "fiction", "author": "Evelyn Waugh", "title": "Sword of Honour", "price": 12.99 }, { "category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "isbn": "0-553-21311-3", "price": 8.99 }, { "category": "fiction", "author": "J. R. R. Tolkien", "title": "The Lord of the Rings", "isbn": "0-395-19395-8", "price": 22.99 } ] I can get the

问题 We use the Jeks parser at present to evaluate expressions. I cannot see a way to evaluate string expressions with it - for example: IF( "Test 1" = "Test 2") Is there anything out there that can evaluate string and mathematical expressions in Java? Preferably free or open source. Thanks for any help, Andez 回答1: There are a lot of tools out there to evaluate expressions; the correct answer will depend on your exact goals. Two things that I'd look at: Commons EL, which evaluates JSP 2.0

问题 I have the following structure: <table> ... <tr><td><input name="email" /></td></tr> ... </table> Question: what is the expression to select that tr based on the "name" attribute of the "input" tag? More specifically, I want to know if there is a way to do this without having to select the input and then go up the hierarchy doing ->parentNode->parentNode... Thanks in advance. 回答1: Use : //table/tr[td/input/@name = 'email'] This means : Select all tr elements that are children of a table and

问题 Given that I was passing the undefined function: void foo(char, short); I learned how to obtain the type tuple of the arguments by calling decltype(m(foo)) with this function: template <typename Ret, typename... Args> tuple<Args...> m(Ret(Args...)); I would now like to pass an undefined method: struct bar { void foo(char, short); }; I had tried rewriting m like: template <typename Ret, typename C, typename... Args> tuple<Args...> m(Ret(C::*)(Args...)); But when I try to call this similarly