The rules-and-constraints tag has no usage guidance.
0
votes
1answer
24 views
Validating combinations based on rule sets (or similar mechanism)
Let's say I've got many functions and each function accepts an unordered list (order does not matter). For each function I want to see if this list is valid based on certain rules (a knowledgebase ...
3
votes
0answers
27 views
Preferred approach to a matching process
I am currently in the process of putting together a matching algorithm. The matching process is as follows:
Query data is used to perform a "lookup" on a set of reference data in order to determine ...
0
votes
2answers
47 views
Trouble handling constraints for the input of a method
I'm looking for advice on how to handle constraints on the input of a method. I have a method that only works if the input argument(s) fulfill certain constraints. If the method is called on input ...
2
votes
0answers
44 views
Specifying a bi-directional unique constraint on a join table in Postgres
Problem description
I have a situation where I want to enforce that a relationship can only be defined once and I want to solve it on database (Postgres) level.
The following situation I consider ...
3
votes
2answers
235 views
C#/VB struct – how to avoid case with zero default values, which is considered invalid for given structure?
How to implement some constrained .NET struct/structure (let's say LimitedString), where its state with default values (set by CLR to technical defaults, i.e. nulls, zeros, etc.) should be prohibited ...
0
votes
1answer
89 views
Mapping match-up combinations into an integer
First of all, I want to say I wasn't sure if I should post this here or in math.stackexchange but I think the question is too programming-related to belong to the latter community. Definetly not a SO ...
15
votes
5answers
651 views
Is scientific code a different enough realm to ignore common coding standards?
Lately I've been trying to wrap my mind about the following fact.
On one hand, there is a host of coding guidelines and standards for what is considered to be "healthy", "clean", "well-written" and ...
2
votes
2answers
89 views
From a set of rules, derive the implications? [closed]
I've only just become interested in this domain, so sorry if I'm not using the correct terminologies.
What I want is the following: Say I have a set of rules (or constraints), I want to derive some ...
4
votes
2answers
160 views
Database constraints for a recursive folders structure
In an application, I have a recursive folder structure (like folders in OS X or Windows file system).
Each folder can contain three kind of things:
Other folders (hence the recursive structure)
...
0
votes
0answers
153 views
Algorithm to maximize pairwise comparisons using transitive property
I'm looking for some direction on building an algorithm that will maximize the number of pairwise comparisons of objects in a set using transitivity.
To explain in detail:
Suppose there are x ...
22
votes
4answers
3k views
Calendar/Planning algorithm
I'm facing a problem I'm not sure how to approach. I have to generate a calendar for employees, each of them having specific work constraints (some personal, some common)
What I'm working with :
I ...
0
votes
1answer
176 views
How to deal with product owner who refuses to follow UI design rules
We develop Android application. We base on old version of similar application developed in our company. This old application was designed by some noobs which didn't follow UI Android design rules.
...
3
votes
1answer
237 views
Fixing bad data in a database - redo or incremental
I have pseudo-ownership of a fairly old db (original data from 30 years ago; current design is >15 years old). In my opinion, the schema is pretty broken, and one of the implications of this is that ...
3
votes
0answers
95 views
Environment that enables variable constraint checking and creation
Currently I'm working on a system that enables users to add Tag's to available TagTypes on specific pages. For instance, we would have a TagType called "Installer" and the user wants his name ...
0
votes
4answers
67 views
alerting that an object cannot be deleted (due to constraints)
Assume an application with a rich domain model with many classes (e.g School, Classroom, Teacher, Student, Course, Exam, Submission, ...) linking to each other. Model and links are mapped to the ...
1
vote
1answer
412 views
Chained ruleset parsing and evaluation code: recommendations?
So I have to write a filtering system, which may apply preprocessed ruleset to data - and trigger some actions defined in the ruleset while continuing its evaluation.
<ruleset name="1">
<...
1
vote
2answers
898 views
Is there a download limit to ios apps?
With reference to iOS 7.
I couldn't find any Apple documents with regards to this.
Are we able to download any size of documents and manage them ourselves (within our app say < 100MB)?
Example, we ...
0
votes
1answer
2k views
Guidance on Excel VBA resource scheduling algorithm?
This was posted originally at StackOverflow though suggested to post here instead.
I am looking to create an Excel VBA solution that will create a rota/schedule allocating staff to service users ...
13
votes
4answers
2k views
Conceptually, how does one make a rules/constraints (not graphics/physics) engine for a game
I want to make a simple game similar to the choose-your-own-adventure books. The player is presented with a narrative text and gets to choose his action from a list of possibilities. This, in turn, ...
1
vote
3answers
3k views
How do I convert a list of Requirements into Constraints?
I am trying to prepare my first software design document. I am self-taught and have no formal training in CS. Having done a wee bit of reading up on it beforehand, I have created a list of ...
2
votes
3answers
191 views
What kind of algorithm could be used to produce an ordering which maximizes # of satisfied 'less than' constraints?
Let's say I have a set of items {e1, e2, ..., en}, and I also have a set of constraints {c1, c2, ..., cm}, with ci := ej appears before ek, for some j and k.
I want to produce an ordering of my items ...
1
vote
0answers
134 views
Understanding algorithms for numeric constraint solving
As an educational exercise, I am looking to implement a constraint solver from scratch. However, since the field is entirely new to me, I am at a loss of where to begin with background research.
The ...
1
vote
1answer
218 views
Is there a name for this kind of database constraint? “Functional foreign key”? And is it a good idea?
Say we want to enforce that a table represents a tree. I have found this method for doing so:
create table tree (
id integer[] primary key,
parent integer[] references tree (id),
item text not ...
2
votes
2answers
152 views
Should I check integrity in my application code or defer to the database? [duplicate]
At work we have a lot of code like this (pseudocode):
response form_submit(string username, string password) {
if ( username == ""
|| username.contains(invalid_chars)
|| password.length &...
6
votes
4answers
1k views
Representing a rule in a ruleset
How to represent rules for a rule engine as objects?
A rule would be
if (booleanExpression(input)) then a chain of generic actions" else next rule
...where the generic actions might be e.g. ...
1
vote
1answer
1k views
What does value propagation mean?
I am working on an algorithm which calculates intervals for variables in some given constraints. For example there is a function called propagateValues and its description is
Propagate value ...
1
vote
3answers
2k views
How do I approach this PHP/MYSQL query?
I have a reservation system that I have coded and my final task is to allow the user to enter a set of dates and then show them all available options.
The reservation table is set up with unit_id, ...
6
votes
2answers
901 views
How to program for constraints/rules
First the background, during interviews in the past, many times I have been asked to design some or other variation of card game as programming puzzle, and I have tried to design it in OO way, but I ...
7
votes
6answers
3k views
Highly scalable and dynamic “rule-based” applications?
For a large enterprise app, everyone knows that being able to adjust to change is one of the most important aspects of design. I use a rule-based approach a lot of the time to deal with changing ...
16
votes
6answers
2k views
Representing business rules with exceptions
I know it is expensive but (IMO) I believe it is a very good practice. I'm talking about rules like say, you can't save an Invoice if you are not a sales person... so in that case throwing an ...
