negation

Negation of %in% in R [duplicate]

由 喜夏-厌秋 提交于 2019-11-27 23:05:34
问题 This question already has answers here : Opposite of %in% (8 answers) Closed last year . Is there a short negation of %in% in R like !%in% or %!in% ? Of course I can negate c("A", "B") %in% c("B", "C") by !(c("A", "B") %in% c("B", "C")) (cf. this question) but I would prefere a more straight forward approach and save a pair of brackets (alike presumably most people would prefer c("A", "B") != c("B", "C") over !(c("A", "B") == c("B", "C")) ). 回答1: No, there isn't a built in function to do that

Negation in Python

由 风流意气都作罢 提交于 2019-11-27 17:55:12
I'm trying to create a directory if the path doesn't exist, but the ! (not) operator doesn't work. I'm not sure how to negate in Python... What's the correct way to do this? if (!os.path.exists("/usr/share/sounds/blues")): proc = subprocess.Popen(["mkdir", "/usr/share/sounds/blues"]) proc.wait() The negation operator in Python is not . Therefore just replace your ! with not . For your example, do this: if not os.path.exists("/usr/share/sounds/blues") : proc = subprocess.Popen(["mkdir", "/usr/share/sounds/blues"]) proc.wait() For your specific example (as Neil said in the comments), you don't

how to pass a not like operator in a sqlalchemy ORM query

由 时光毁灭记忆、已成空白 提交于 2019-11-27 14:18:23
问题 I've got a query: MyModel.query.filter(Mymodel.name.contains('a_string')) I need to do the same query but with the negation (a not like operator) but didn't find any operator matching my need in the SQLAlchemy documentation. Is there any way to do it without using the sql part of SQLAlchemy??? 回答1: Just negate the filter: MyModel.query.filter(sqlalchemy.not_(Mymodel.name.contains('a_string'))) 来源： https://stackoverflow.com/questions/5018694/how-to-pass-a-not-like-operator-in-a-sqlalchemy-orm

How to filter an array of objects based on values in an inner array with jq?

由 你说的曾经没有我的故事 提交于 2019-11-27 10:15:18
Given this input: [ { "Id": "cb94e7a42732b598ad18a8f27454a886c1aa8bbba6167646d8f064cd86191e2b", "Names": [ "condescending_jones", "loving_hoover" ] }, { "Id": "186db739b7509eb0114a09e14bcd16bf637019860d23c4fc20e98cbe068b55aa", "Names": [ "foo_data" ] }, { "Id": "a4b7e6f5752d8dcb906a5901f7ab82e403b9dff4eaaeebea767a04bac4aada19", "Names": [ "jovial_wozniak" ] }, { "Id": "76b71c496556912012c20dc3cbd37a54a1f05bffad3d5e92466900a003fbb623", "Names": [ "bar_data" ] } ] I'm trying to construct a filter with jq that returns all objects with Id s that do not contain "data" in the inner Names array, with

What does !! (double exclamation point) mean?

由 徘徊边缘 提交于 2019-11-27 08:34:11
In the code below, from a blog post by Alias , I noticed the use of the double exclamation point !! . I was wondering what it meant and where I could go in the future to find explanations for Perl syntax like this. (Yes, I already searched for !! at perlsyn ). package Foo; use vars qw{$DEBUG}; BEGIN { $DEBUG = 0 unless defined $DEBUG; } use constant DEBUG => !! $DEBUG; sub foo { debug('In sub foo') if DEBUG; ... } UPDATE Thanks for all of your answers. Here is something else I just found that is related The List Squash Operator x!! It is just two ! boolean not operators sitting next to each

Why doesn't this CSS :not() declaration filter down?

由 ＊爱你＆永不变心＊ 提交于 2019-11-27 05:37:17
I want to select spans that are not the descendants of a specific class, let's call it "no". Here's my CSS: div:not(.no) span{background-color:#00f;} Here's the HTML <div> <span>yes 1</span> </div> <div class="no"> <span>no 1</span> </div> <div class="no"> <div> <span>no 2</span> </div> </div> Two questions: Why does my CSS apply to both yes 1 and no 2? Why does the whole thing break if I switch to a universal selector? *:not(.no) span{background-color:#00f;} Here's the code in JSFiddle: http://jsfiddle.net/stephaniehobson/JtNZm/ Both of the span elements' parent div elements don't have the

String negation using regular expressions

由 爱⌒轻易说出口 提交于 2019-11-27 01:28:48
问题 Is it possible to do string negation in regular expressions? I need to match all strings that do not contain the string ".." . I know you can use ^[^\.]*$ to match all strings that do not contain "." but I need to match more than one character. I know I could simply match a string containing ".." and then negate the return value of the match to achieve the same result but I just wondered if it was possible. 回答1: You can use negative lookaheads: ^(?!.*\.\.).*$ That causes the expression to not

How does the NEG instruction affect the flags on x86?

由 时间秒杀一切 提交于 2019-11-26 23:28:36
问题 The Intel Software Development Manual says this about the neg instruction: The CF flag set to 0 if the source operand is 0; otherwise it is set to 1. The OF, SF, ZF, AF, and PF flags are set according to the result. I thought that AF and CF would be set as if neg %eax were replaced by, not %eax # bitwise negation add $1, %eax But that's not the case, negating 0x6ffffef5 on a real CPU sets AF and CF. 回答1: neg sets all flags identically to what you'd get with a sub from 0. This sequence of

How to filter an array of objects based on values in an inner array with jq?

由 吃可爱长大的小学妹 提交于 2019-11-26 15:04:44
问题 Given this input: [ { "Id": "cb94e7a42732b598ad18a8f27454a886c1aa8bbba6167646d8f064cd86191e2b", "Names": [ "condescending_jones", "loving_hoover" ] }, { "Id": "186db739b7509eb0114a09e14bcd16bf637019860d23c4fc20e98cbe068b55aa", "Names": [ "foo_data" ] }, { "Id": "a4b7e6f5752d8dcb906a5901f7ab82e403b9dff4eaaeebea767a04bac4aada19", "Names": [ "jovial_wozniak" ] }, { "Id": "76b71c496556912012c20dc3cbd37a54a1f05bffad3d5e92466900a003fbb623", "Names": [ "bar_data" ] } ] I'm trying to construct a

What does !! (double exclamation point) mean?

由 对着背影说爱祢 提交于 2019-11-26 14:11:56
问题 In the code below, from a blog post by Alias, I noticed the use of the double exclamation point !! . I was wondering what it meant and where I could go in the future to find explanations for Perl syntax like this. (Yes, I already searched for !! at perlsyn). package Foo; use vars qw{$DEBUG}; BEGIN { $DEBUG = 0 unless defined $DEBUG; } use constant DEBUG => !! $DEBUG; sub foo { debug('In sub foo') if DEBUG; ... } UPDATE Thanks for all of your answers. Here is something else I just found that
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