simplify

How to implement a custom simplify tactic in Z3?

由 余生颓废 提交于 2019-12-11 02:56:21
问题 In my tool, I use conditions that compare constants to integer variables (for example y < 100). Often, there are multiple conditions for one variable and I want to simplify those cases. For example: y < 100 && y != 99 should become y < 99. The simplify tactic does not do this and none of the arguments for simplify sound like they can help. In Code: context c; goal g(c); expr x = c.int_const("x"); expr y = c.int_const("y"); solver s(c); expr F = y < 100 && y != 99; g.add(F); tactic t = tactic

Can this sql query be simplified?

由 為{幸葍}努か 提交于 2019-12-10 23:18:12
问题 I have the following tables: Person, {"Id", "Name", "LastName"} Sports, {"Id" "Name", "Type"} SportsPerPerson, {"Id", "PersonId", "SportsId"} For my query I want to get all the Persons that excersise a specific Sport whereas I only have the Sports "Name" attribute at my disposal. To retrieve the correct rows I've figured out the following queries: SELECT * FROM Person WHERE Person.Id in ( SELECT SportsPerPerson.PersonId FROM SportsPerPerson INNER JOIN Sports on SportsPerPerson.SportsId =

Extending dc.js to add a “simpleLineChart” chart

由 一曲冷凌霜 提交于 2019-12-06 11:56:49
问题 edit See here for the non-working example of what I'm trying to do: http://bl.ocks.org/elsherbini/5814788 I am using dc.js to plot data collected from bee hives at my university. I am pushing new data to the graphs on every database change (using the magic of Meteor). When the database is over 5000 records or so, rerendering the lines gets really slow. So I want to use simplify.js to preprocess the lines before rendering. To see what I'm talking about, go to http://datacomb.meteor.com/. The

Automatically simplifying/refactoring Python code (e.g. for loops -> list comprehension)? [closed]

由 烂漫一生 提交于 2019-12-05 01:52:02
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . In Python, I really enjoy how concise an implementation can be when using list comprehension. I love to do concise list comprehensions this: myList = [1, 5, 11, 20, 30, 35] #input data bigNumbers = [x for x in myList if x > 10] However, I often encounter more verbose implementations like this: myList = [1, 5, 11

Extending dc.js to add a “simpleLineChart” chart

由 ぐ巨炮叔叔 提交于 2019-12-04 16:16:14
edit See here for the non-working example of what I'm trying to do: http://bl.ocks.org/elsherbini/5814788 I am using dc.js to plot data collected from bee hives at my university. I am pushing new data to the graphs on every database change (using the magic of Meteor). When the database is over 5000 records or so, rerendering the lines gets really slow. So I want to use simplify.js to preprocess the lines before rendering. To see what I'm talking about, go to http://datacomb.meteor.com/ . The page freezes after a couple of seconds, so be warned. I have started to extend dc.js with a

Simplifying nested Maybe pattern matching

由 懵懂的女人 提交于 2019-12-04 13:42:40
I have the following construct in my code: f :: Maybe A -> X f a = case a of Nothing -> x (Just b) -> case b of Nothing -> y (Just c) -> case c of Nothing -> z (Just d) -> d I'm not seeing an obvious way to simplify this instead of using nested maybe functions, which wouldn't make the whole thing look much better. Are there any clever - but still understandable - tricks that would help make this construct more "elegant"? UPDATED 2 Monad Either is for you import Data.Maybe (maybe) maybeE :: e -> Maybe a -> Either e a maybeE e = maybe (Left e) Right f :: Maybe (Maybe (Maybe d)) -> Either e d f a

Simplify multiple if statements that use if (string.contains())

由 假如想象 提交于 2019-12-04 06:05:08
问题 I am working on a personal assistant program and I have a method called input_parse() which looks at the input string and checks for words that correspond to "commands" the pseudo code looks like this. if (input.contains("argA") {//execute command A} if (input.contains("argB") && input.contains("argC")) {//execute command B} is there a simpler way to tackle this problem perhaps with a string array of commands and then use a switch statement for the commands based on the index of the argument?

R: Simplifying long ifelse statement

由 笑着哭i 提交于 2019-12-02 07:45:18
问题 I'm trying to create new variables based on a procedure code variable with 2500+ values in a medical dataset to pull out the antibiotics, their dose, and route. I've been able to do this with ifelse statements, but it was time consuming, and is difficult to find and correct mistakes. Is there a simplified way to do this? Unfortunately the codes aren't organized in any logical way. vet <-mutate(vet, ab = ifelse(ProcedureCode=="6160"|ProcedureCode=="2028"|ProcedureCode=="6121"|ProcedureCode==

R: Simplifying long ifelse statement

由 徘徊边缘 提交于 2019-12-02 07:08:47
I'm trying to create new variables based on a procedure code variable with 2500+ values in a medical dataset to pull out the antibiotics, their dose, and route. I've been able to do this with ifelse statements, but it was time consuming, and is difficult to find and correct mistakes. Is there a simplified way to do this? Unfortunately the codes aren't organized in any logical way. vet <-mutate(vet, ab = ifelse(ProcedureCode=="6160"|ProcedureCode=="2028"|ProcedureCode=="6121"|ProcedureCode=="6130"|ProcedureCode=="6131"|ProcedureCode=="6132"|ProcedureCode=="6133" |ProcedureCode=="6134"

Simplifying the regex “ab|a|b”

由 醉酒当歌 提交于 2019-12-01 22:55:39
问题 (How) could the following regex be simplified: ab|a|b ? I'm looking for a less redundant one, i.e. with only one a and one b . Is it possible? Some tries: a?b? # matches empty string while shouldn't ab?|b # still two b Note that the real regex has more complicated a and b parts, i.e. not a single char but inner subregexes let's say. 回答1: If you are using Perl or some PCRE engine (like PHP's preg_ functions), you can refer to previous groups in the pattern, like this: /(a)(b)|(?1)|(?2)/ The
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