cellular-automata | cellular automata with a couple lines | Machine Learning library
kandi X-RAY | cellular-automata Summary
kandi X-RAY | cellular-automata Summary
Creating a cellular automata with a couple lines of descriptive language and watch how it evolves:. It now supports hot loading, CONTINUE and STEP each loads the new paradigm from a pause. ^^ This correspond to conway's game of life. This correspond to a forest fire (more complex);.
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QUESTION
I've been messing around with cellular-automata for a while now, and the way I chose to implement them is by creating a 2D vector of cells, where each cell was initially a vector of integers itself (because I want each cell to store more than one value), which I later changed to short unsigned integers, and then to chars, because I realized the smallest data type is more than enough for my needs...
I'm currently looking for ways to improve performance, and it got me thinking, would it be better optimization-wise if I replaced the vector of chars with a string?
Knowing that the entire matrix always has a fixed size, meaning the size of the 2D grid as well as that of each cell is allocated from the beginning and is unchanging for the duration of the program's runtime:
Which one is faster to access? Modify? Copy? Or preform general operations on?
Also, I know I said everything has a fixed size, but just for future reference, according to my surface-level knowledge of vectors, a vector has to be re-allocated everytime you push_back() a new element into it, is that the case with strings?
...ANSWER
Answered 2021-May-03 at 16:07which one is faster?
Depends. Either one, depending on how you use them. You can find out whether one is measurably faster than the other by... measuring.
They both use fundamentally the same abstract data structure, and have the same asymptotical complexity for all operations.
according to my surface-level knowledge of vectors, a vector has to be re-allocated everytime you push_back()
Your knowledge is incorrect. A std::vector has to only be reallocated when the capacity of the vector is exceeded, which isn't everytime you push_back. Same appilies to std::string
QUESTION
I am trying to learn some Haskell by looking at a superb short and educational article on comonad application from 2006 link and it contains an expression like rule (U (a:_) b (c:_)) = not (a && b && not c || (a==b)) whre U is a zipper comonad. That is stated in data U x = [x] x [x] and accompanying implementations of the comonad operations.
Trying to learn more, I am attempting to annotate the type of the expression manually. A wise choice seems to be rule :: U Bool -> Bool, but that seems a bit... restrictive. I could imagine other types that would be able to have truthyness values, such as Ints (0 corresponds to false, all other values could be True) and other.
If there was a type class for truthyness called truthy, I guess I could write rule :: (Truthy t) => U t -> Bool. Since I want to iterate over rule, the first type annotation (rule :: U Bool -> Bool) is good enough, but still the question tickles my brain.
Is there such a typeclass? If there is, what is it called? If not, why is there no need for it?
...ANSWER
Answered 2017-Jul-04 at 23:39Digression: Generally we don't use type classes to do what you might call mere overloading, of the sort you find in dynamic languages (e.g. making + mean "concatenate lists" or "add ints", or overloading boolean operations to work on "truthy" values as in your question). The difference is I guess that we say good abstractions are made with type classes that have a set of laws that hold them together, so that you can write polymorphic code that is useful. It might be that we can make a "truthy" class that's good by this standard but I'm not sure.
But to get to your question, there are certainly classes that abstract boolean logic to some degree (the field of study here being maybe Boolean algebra), the most relevant here probably being the Bits class from Data.Bits.
So you'd get:
QUESTION
newbie in netlogo here. I'm simulating a flood model using cellular-automata. It's just a simple one - cell should be filled (change color) or sprout if water > elevation.
For a dummy code, I'm trying to do it this way:
...ANSWER
Answered 2017-Mar-28 at 20:33I played around with this a little and it seems to me like you want your starting patch to fill up, and once it hits its maximum value, to start flooding into other cells that repeat the process. I think the main problem is that in your water-rise, you have are asking all patches with elevation greater than -9999 to first call the starting-point procedure and then also to sprout a turtle if they have any neighbors with elevation is less than cell-storage. It appears that all patches satisfy that condition, so all patches will sprout a turtle.
It may work better to rework your flow of logic, so that filling up your breach patch is independent of other patches. Something like:
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