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1
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1answer
55 views

Transitions taking place in NFA

While studying about NFA and DFA in Compiler Design I couldn't get how they converted an regular expression to NFA as shown in NFA.I would like to know why there is an epsilon transition between (8 ...
0
votes
1answer
50 views

Significance of NFA in Compiler Design

While I was studying about Compiler Design it tells that we need 'finite automata' while designing a lexical analyzer like DFA or NFA. So I would like to know whether NFA is only used for conversion ...
0
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1answer
68 views

Real-time theory: how is period transformation implemented with delay requests?

To deal with transient overloads with a real-time system scheduled with rate-monotonic scheduling, one can use period transformation to reduce the period of important processes so that they have ...
4
votes
3answers
100 views

How message acknowledge deadlock problem is being solved in real world applications?

To my understanding message acknowledge deadlock problem is this: In order to sync value X between A and B A sends X to B A waits for B to send acknowledgment to A so it makes sure B has latest X B ...
54
votes
4answers
4k views

What is the purpose of a Code Review

I am in the process of trying to sell my organisation on the value of code reviews. I have worked at several places where they were employed. I have seen them used to nitpick styling choices, and ...
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2answers
165 views

How to measure algorithm accuracy?

I have a few optimization algorithms (for finding function minimum) and I'd like to check how good they are. Suppose I build test cases and compare the actual results to theoretical ones. What ...
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2answers
95 views

How can I make sense of the word “Functor” from a semantic standpoint? [closed]

When facing new programming jargon words, I first try to reason about them from an semantic and etymological standpoint when possible (that is, when they aren't obscure acronyms). For instance, you ...
4
votes
1answer
78 views

Mapping multiple differing taxonomies to each other

At work we have a varied number of websites selling second-hand products. The bosses have noticed that there's often some overlap between the products sold on some of the websites and would like to ...
1
vote
5answers
165 views

What defines the dimensionality of an array?

I know that when we speak about an array having 1, 2, or 4 dimensions, we mean arrays like this: 1: [0] 2: [0,0] 3: [0,0,0] 4: [0,0,0,0] ... Is the first 'axis' of an array the only thing that ...
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11answers
7k views

How does the “Fourth Dimension” work with arrays?

Abstract: So, as I understand it (although I have a very limited understanding), there are three dimensions that we (usually) work with physically: The 1st would be represented by a line. The 2nd ...
2
votes
0answers
111 views

Is there a theory for “transactional” sequences of failing and no-fail actions?

My question is about writing transaction-like functions that execute sequences of actions, some of which may fail. It is related to the general C++ principle "destructors can't throw," no-fail ...
0
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2answers
47 views

Hashing + security as it pertains to a theoretical file sharing site

These days it's possible to hash a file client-side, send the hash to the server, and have the server check whether or not that file is already uploaded. If it is, we can skip the file upload and make ...
4
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3answers
1k views

Japanese Multiplication simulation - is a program actually capable of improving calculation speed?

I'd like to write a simulation of Japanese Multiplication to get benchmarks on large calculations utilizing the shortcut vs traditional CPU multiplication. I'm curious as to whether it makes sense to ...
5
votes
5answers
594 views

Theoretically bug-free programs

I have read lot of articles which state that code can't be bug-free, and they are talking about these theorems: Halting problem Gödel's incompleteness theorem Rice's theorem Actually Rice's ...
2
votes
3answers
694 views

Left and Right most Derivation

So i understand the semantics of derivations as far as Backus Naur Form goes. One thing I cannot find in any text book or the various lecturers' notes that are on-line is this. When would a right ...
3
votes
1answer
228 views

Epsilon Transitions in an NFA

I'm attempting to teach myself the basics of finite automata and have been exploring the differences between Deterministic Finite Automata and Non Deterministic Finite Automita. One thing that pops ...
5
votes
5answers
1k views

What negative consequences can arise from this language design rule?

Clarification: the rule is meant to prevent accessing variables that are not declared yet. Clarification 2: the rule mandates that the compiler follows calls to functions which are defined in the ...
0
votes
2answers
94 views

Could one sample be enough for a perceptron training?

I need to compare a picture and decide whether or not it is similar to another one. In this case, I would like to use a simple perceptron that compares pixelmaps of both pictures. But I have only very ...
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6answers
1k views

What is an example of a computationally impossible business problem?

I have coworker who refuses to accept the reality that Turing machines (and Von Neuman machines by extension) cannot solve their own halting problem stating: You can do anything with enough time ...
1
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1answer
173 views

Minimax in a bayesian game with multiple players who do not play in order

Premise: I know that such a game would be better solved by MCTS, however, from a theoretical point of view, would it be possible to apply minimax to a bayesian multiplayer game where the order of ...
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9answers
2k views

Why not expose a primary key

In my education I have been told that it is a flawed idea to expose actual primary keys (not only DB keys, but all primary accessors) to the user. I always thought it to be a security problem ...
0
votes
1answer
162 views

category theory based language

It may sound naive, but is there any programming language, or research thereof, based entirely on category theory? I mean this as opposed to embedding CT concepts as an additional feature (like for ...
3
votes
1answer
213 views

Are there any formalized/mathematical theories of software testing? [duplicate]

Googling "software testing theory" only seems to give theories in the soft sense of the word; I have not been able to find anything that would classify as a theory in the mathematical, information ...
1
vote
1answer
297 views

Operating systems theory — using minimum number of semaphores

This situation is prone to deadlock of processes in an operating system and I'd like to solve it with the minimum of semaphores. Basically there are three cooperating processes that all read data ...
2
votes
2answers
205 views

Theory Of A Weird Thought - Forms Submission

In theory, if you were to open two computers that were perfectly synced together on a website that has a form. This form has fields where say for example the username has to be unique. Assuming both ...
4
votes
2answers
180 views

Is excessive indirection and/or redundant encapsulation a recognized concept? [closed]

I'm curious if there's a series of tendencies or anti-patterns when programming whereby a developer will always locally re-wrap external dependencies when consuming them. A slightly less vague ...
73
votes
11answers
7k views

How can I make sure that I'm actually learning how to program rather than simply learning the details of a language?

I often hear that a real programmer can easily learn any language within a week. Languages are just tools for getting things done, I'm told. Programming is the ultimate skill that must be learned and ...
-1
votes
3answers
2k views

Why are algorithms and data structures important? [duplicate]

It seems like a lot of university-level computer science programs and programmer job interviews focus heavily on algorithms and data structures. I'm curious as to why universities and employers put so ...
2
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2answers
162 views

Equivalence partitioning understanding A<5 and B<5

I do not understand the following example. It says that a function X will be executed if either of A and B variables will be lower than 5. The go on and explains that there are three valid equivalence ...
1
vote
1answer
331 views

Immutable Data Structure For Time Series Data

I'm wondering what the best data structure (for storing data on disk) is for storing immutable time-series data (99% of the data is truly immutable, the 1% is metadata that is separate from the ...
9
votes
5answers
334 views

What are some possible interactions between multiple bugs? [closed]

I was thinking about how two bugs could interact with one another. The only relationship I can think of is one bug being the cause of another. What other interactions between multiple defects are ...
5
votes
1answer
357 views

Subsumption architecture vs. perceptual control theory

I'm a new person to AI field and I have to research and compare two different architectures for a thesis I'm writing. Before you scream (homework thread), I've been reading on these two topics only ...
4
votes
2answers
966 views

Array Multiplication and Division

I came across a question that (eventually) landed me wondering about array arithmetic. I'm thinking specifically in Ruby, but I think the concepts are language independent. So, addition and ...
0
votes
1answer
94 views

Is context-driven testing suitable for all projects?

One thing I cannot find anywhere is: is this approach limited to non-critical software? Because in critical (or just when customer wants us to follow his rules) we have no freedom in testing and just ...
1
vote
1answer
299 views

“Generators are function derivatives”

I am reading this article on a new feature of ECMAscript 6, generators, that are landing in the V8 JavaScript interpreter. Not too far from the top, the author suggests an analogy: generators are ...
1
vote
1answer
219 views

Pairwise testing, not possible to say which combinations is faulty?

Let's say I have 4 (A,B,C,D) parameters with 3 possible values, also 81 unique combinations. With e.g. orthogonal array, I will end up with 9 test cases, each combining 3 pairs. But that means that if ...
3
votes
2answers
1k views

Which code is better for branch prediction optimization?

Given branch prediction, and also the effect of compiler optimizations, which code tends to offer superior performance? Note that bRareExceptionPresent represents an uncommon condition. It is not the ...
0
votes
2answers
241 views

How to use lists in equivalence partitioning?

I have read that equivalence partitioning can be used typically for intervals or lists, e.g. I assume it can be used for every set of inputs. Anyway if the requirement says that allowed colors are ...
1
vote
2answers
163 views

What is the real point of an “oracle” in the SW testing?

I know the definition of an testing oracle but to me, it seems to be overrated. I have a specification, why should I bother with thinking about oracles? I just compare what the spec wants and what the ...
1
vote
3answers
330 views

If functional testing is referred as black box..how can it be done on unit test level?

Preparing myself for ISTQB, I found a bit odd many things in their textbooks. E.g. they call black box testing as functional testing when you are not concerned with structured but only observe the ...
1
vote
2answers
702 views

Test case design - do for all positive tests exist also negative ones?

There is ambiguity in all papers I have read so I would like to ask about the following requirement: Requirement: Being a Game master, I can access the GM menu by typing "menuInvoke". Trying to do ...
6
votes
9answers
4k views

Negative test cases confusion

In the Software testing book from Koirala, Sheihk, they say: A positive test is when you put in a valid input and expect some action to be completed in accordance with the specification. A ...
13
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4answers
2k views

Why does Cem Kaner consider a test not revealing a bug a waste of time?

What about confirming the functionality in positive tests, proving it is working - should I say it is a waste of time? What kind of concept is behind this quote? Unsuccessful tests, i.e. tests ...
2
votes
2answers
207 views

Class of problems solvable by sed or stream editors

I've came across a question transform this text with sed [sed only] and it got me wondering what class of problems is solvable by stream editors or programs/computational models with similar ...
2
votes
4answers
261 views

Theory about software communications mixing up with other software causing an Apocalypse?

I can remember a very Very long time ago (pre Y2K) , reading an article by some "expert" that theorized that software communicating over the internet, especially video games could get mixed up with ...
0
votes
1answer
1k views

Why is black box called functional testing when it tests also non functional?

This has been bothering me for a while. Security, performance tests etc. are all done typically using the black box approach. But these are nonfunctional,while black box is called functional testing. ...
0
votes
2answers
128 views

Is a “build” assembly?

In an old book I have, they say that "build" is either a process of converting source code into executable or the actual result - assembly. Is that correct? Is a build actually the assembly, I mean ...
14
votes
8answers
2k views

What non-theoretical, practical programming language has no reserved keywords?

I have been searching for a practical programming language that has no reserved keywords but I haven't had any luck finding one. I am working on a programming language for my own edification and ...
6
votes
3answers
1k views

Cyclomatic complexity with two IFs - why it is 3?

I have read an article with following example: void func() { if (condition1) a = a + 1; if (condition2) a = a - 1; } It says the CC is 3 as there are three possible paths. How come? Why not 4? I ...
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4answers
2k views

Stack and heap - dynamic allocation question

Sources usually mention that dynamically created variables are allocated on the heap, while functions' variables on the stack. Also the ones on the stack cease to exist automatically when e.g. the ...