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Top Answer
Answered Sep 30, 2011 · 2 votes
ILP can be used to solve essentially any problem involving making a bunch of decisions, each of which only has several possible outcomes, all known ahead of time, and in which the overall "quality" of any combination of choices can be described using a function that doesn't depend on "interactions" between choices. To see how it works, it's easiest to restrict further to variables that can only be 0 or 1 (the smallest useful range of integers). Now:
- Each decision requiring a yes/no answer becomes a variable
- The objective function should describe the thing we want to maximise (or minimise) as a weighted combination of these variables
- You need to find a way to express each constraint (combination of choices that cannot be made at the same time) using one or more linear equality or inequality constraints
Example
For example, suppose you have 3 workers, Anne, Bill and Carl, and 3 jobs, Dusting, Typing and Packing. All of the people can do all of the jobs, but they each have different efficiency/ability levels at each job, so we want to find the best task for each of them to do to maximise overall efficiency. We want each person to perform exactly 1 job.
Variables
One way to set this problem up is with 9 variables, one for each combination of worker and job. The variable x_ad will get the value 1 if Anne should Dust in the optimal solution, and 0 otherwise; x_bp will get the value 1 if Bill should Pack in the optimal solution, and 0 otherwise; and so on.
Objective Function
The next thing to do is to formulate an objective function that we want to maximise or minimise. Suppose that based on Anne, Bill and Carl's most recent performance evaluations, we have a table of 9 numbers telling us how many minutes it takes each of them to perform each of the 3 jobs. In this case it makes sense to take the sum of all 9 variables, each multiplied by the time needed for that particular worker to perform that particular job, and to look to minimise this sum -- that is, to minimise the total time taken to get all the work done.
Constraints
The final step is to give constraints that enforce that (a) everyone does exactly 1 job and (b) every job is done by exactly 1 person. (Note that actually these steps can be done in any order.)
To make sure that Anne does exactly 1 job, we can add the constraint that x_ad + x_at + x_ap = 1. Similar constraints can be added for Bill and Carl.
To make sure that exactly 1 person Dusts, we can add the constraint that x_ad + x_bd + x_cd = 1. Similar constraints can be added for Typing and Packing.
Altogether there are 6 constraints. You can now supply this 9-variable, 6-constraint problem to an ILP solver and it will spit back out the values for the variables in one of the optimal solutions -- exactly 3 of them will be 1 and the rest will be 0. The 3 that are 1 tell you which people should be doing which job!
ILP is General
As it happens, this particular problem has a special structure that allows it to be solved more efficiently using a different algorithm. The advantage of using ILP is that variations on the problem can be easily incorporated: for example if there were actually 4 people and only 3 jobs, then we would need to relax the constraints so that each person does at most 1 job, instead of exactly 1 job. This can be expressed simply by changing the equals sign in each of the 1st 3 constraints into a less-than-or-equals sign.
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Top Answer
Answered Mar 10, 2013 · 1107 votes
Here are some branch naming conventions that I use and the reasons for them
Branch naming conventions
- Use grouping tokens (words) at the beginning of your branch names.
- Define and use short lead tokens to differentiate branches in a way that is meaningful to your workflow.
- Use slashes to separate parts of your branch names.
- Do not use bare numbers as leading parts.
- Avoid long descriptive names for long-lived branches.
Group tokens
Use "grouping" tokens in front of your branch names.
group1/foogroup2/foogroup1/bargroup2/bargroup3/bargroup1/baz-
The groups can be named whatever you like to match your workflow. I like to use short nouns for mine. Read on for more clarity.
Short well-defined tokens
Choose short tokens so they do not add too much noise to every one of your branch names. I use these:
wip Works in progress; stuff I know won't be finished soonfeat Feature I'm adding or expandingbug Bug fix or experimentjunk Throwaway branch created to experiment-
Each of these tokens can be used to tell you to which part of your workflow each branch belongs.
It sounds like you have multiple branches for different cycles of a change. I do not know what your cycles are, but let's assume they are 'new', 'testing' and 'verified'. You can name your branches with abbreviated versions of these tags, always spelled the same way, to both group them and to remind you which stage you're in.
new/frabnotznew/foonew/bartest/footest/frabnotzver/foo-
You can quickly tell which branches have reached each different stage, and you can group them together easily using Git's pattern matching options.
$ git branch --list "test/*"test/footest/frabnotz-$ git branch --list "*/foo"new/footest/foover/foo-$ gitk --branches="*/foo"-
Use slashes to separate parts
You may use most any delimiter you like in branch names, but I find slashes to be the most flexible. You might prefer to use dashes or dots. But slashes let you do some branch renaming when pushing or fetching to/from a remote.
$ git push origin 'refs/heads/feature/*:refs/heads/phord/feat/*'$ git push origin 'refs/heads/bug/*:refs/heads/review/bugfix/*'-
For me, slashes also work better for tab expansion (command completion) in my shell. The way I have it configured I can search for branches with different sub-parts by typing the first characters of the part and pressing the TAB key. Zsh then gives me a list of branches which match the part of the token I have typed. This works for preceding tokens as well as embedded ones.
$ git checkout new<TAB>Menu: new/frabnotz new/foo new/bar--$ git checkout foo<TAB>Menu: new/foo test/foo ver/foo-
(Zshell is very configurable about command completion and I could also configure it to handle dashes, underscores or dots the same way. But I choose not to.)
It also lets you search for branches in many git commands, like this:
git branch --list "feature/*"git log --graph --oneline --decorate --branches="feature/*" gitk --branches="feature/*" -
Caveat: As Slipp points out in the comments, slashes can cause problems. Because branches are implemented as paths, you cannot have a branch named "foo" and another branch named "foo/bar". This can be confusing for new users.
Do not use bare numbers
Do not use use bare numbers (or hex numbers) as part of your branch naming scheme. Inside tab-expansion of a reference name, git may decide that a number is part of a sha-1 instead of a branch name. For example, my issue tracker names bugs with decimal numbers. I name my related branches CRnnnnn rather than just nnnnn to avoid confusion.
$ git checkout CR15032<TAB>Menu: fix/CR15032 test/CR15032-
If I tried to expand just 15032, git would be unsure whether I wanted to search SHA-1's or branch names, and my choices would be somewhat limited.
Avoid long descriptive names
Long branch names can be very helpful when you are looking at a list of branches. But it can get in the way when looking at decorated one-line logs as the branch names can eat up most of the single line and abbreviate the visible part of the log.
On the other hand long branch names can be more helpful in "merge commits" if you do not habitually rewrite them by hand. The default merge commit message is Merge branch 'branch-name'. You may find it more helpful to have merge messages show up as Merge branch 'fix/CR15032/crash-when-unformatted-disk-inserted' instead of just Merge branch 'fix/CR15032'.
Other Answers
Answered Jun 14, 2018 · 376 votes
A successful Git branching model by Vincent Driessen has good suggestions. A picture is below. If this branching model appeals to you consider the flow extension to git. Others have commented about flow
Driessen's model includes
- ["A master branch, used only for release. Typical name master .",""]
- ["A \"develop\" branch off of that branch. That's the one used for most main-line work. Commonly named develop .",""]
- ["Multiple feature branches off of the develop branch. Name based on the name of the feature. These will be merged back into develop, not into the master or release branches.",""]
- ["Release branch to hold candidate releases, with only bug fixes and no new features. Typical name rc1.1 .",""]
Hotfixes are short-lived branches for changes that come from master and will go into master without development branch being involved.
Other Answers
Answered Apr 19, 2020 · 72 votes
I've mixed and matched from different schemes I've seen and based on the tooling I'm using. So my completed branch name would be:
name/feature/issue-tracker-number/short-description
which would translate to:
mike/blogs/RSSI-12/logo-fix
The parts are separated by forward slashes because those get interpreted as folders in SourceTree for easy organization. We use Jira for our issue tracking so including the number makes it easier to look up in the system. Including that number also makes it searchable when trying to find that issue inside Github when trying to submit a pull request.
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Expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division.
- A constant is a fixed numerical value.
- A variable is a symbol that does not have a fixed value.
- A constant, a single variable, or a combination of a variable and a constant combined with multiplication or division is defined as a Term.
Types of Expressions
There are three types of expressions:
Arithmetic Expression: This is the expression that includes only numbers and mathematical operators such as addition, subtraction, multiplication, division.
Example: 80-5 x 2, 20+5, 85 – 25 …
Fractional Expression: This is the expression that includes fractional numbers and mathematical operators ..
Example: 6/4 – 5/2 , 20/10 +25/2 etc
Algebraic Expression: This is the expression that Contains variables, numbers, and mathematical operators.
Example: 3x + 12y , 5x + 5y etc.....
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Top Answer
Answered Nov 23, 2010 · 2 votes
Configuration languages are typically declarative. The most common example are Windows INI files, which are processed with using an API provided by Microsoft (or one of the many alternative implementations).
On Unix, many files in /etc follow some configuration language. A simple one would be /etc/inittab (configuration language for /sbin/init), a more complex one is sendmail.cf (configuration language for sendmail). Another example is PAM configuration (on Linux, typically in /etc/pam.d).
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Top Answer
Answered Nov 05, 2019 · 8 votes
.NET / C# - Construction from date parts
Impact Category 1
Defective Code
DateTime dt = DateTime.Now;DateTime result = new DateTime(dt.Year + 1, dt.Month, dt.Day);-
This code will work properly until dt becomes February 29th. Then, it will attempt to create a February 29th of a common year, which does not exist. The DateTime constructor will throw an ArgumentOutOfRangeException.
Variations include any form of DateTime or DateTimeOffset constructor that accepts year, month, and day parameters, when those values are derived from different sources or manipulated without regard to validity as a whole.
Corrected Code
DateTime dt = DateTime.Now;DateTime result = dt.AddYears(1);-
Common Variation - Birthdays (and other anniversaries)
One variation is when determining a user's current birthday without considering leaplings (persons born on February 29th). It also applies to other types of anniversaries, such as hire date, date of service, billing date, etc.
Defective Code
DateTime birthdayThisYear = new DateTime(DateTime.Now.Year, dob.Month, dob.Day);-
This approach needs adjustment, such as the following which uses February 28th for common years. (Though, march 1st might be preferred depending on the use case.)
Corrected Code
int year = DateTime.Now.Year;int month = dob.Month;int day = dob.Day;if (month == 2 && day == 29 && !DateTime.IsLeapYear(year)) day--;DateTime birthdayThisYear = new DateTime(year, month, day);
Corrected Code (alternative implementation)
DateTime birthdayThisYear = dob.AddYears(DateTime.Now.Year - dob.Year);-
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quizlet.com › 262835576 › creative-writing-unit-5Creative Writing Unit 5 Quiz Flashcards | Quizlet
quizlet.com › 262835576 › creative-writing-unit-56 days ago · 1 / 15. Flashcards. Learn. Test. Match. Q-Chat. Created by. Teresa1017. Students also viewed. Creative Writing Unit 5 Speech in Writing. 15 terms. JoeMama_2_0_0_ Preview. Creative Writing Quiz questions and Answers Units 5-8. 60 terms. analisebutler. Preview. Drama Terms. 22 terms. jparadise13. Preview.
www.open.edu › openlearncreate › modSection 5: Using stories and storybooks - OpenLearn
www.open.edu › openlearncreate › mod6 days ago · Name of the story: Cat and Dog and the Ball: Questions that you can ask: 1. Do the cat and dog live in a house? 2. Is there a roof on the house? 3. What do the cat and dog play with? 4. What colour is the ball? 5. Who catches the ball? 6. Who throws the ball? 7. Where is the ball now? 8. Who gets the ball? 9. Why did the elephant get the ball? 10.
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