mdarray | Multidimensional array similar to NumPy and NArray | Machine Learning library
kandi X-RAY | mdarray Summary
kandi X-RAY | mdarray Summary
MDArray subscribes fully to the SciRuby Manifesto (“Ruby has for some time had no equivalent to the beautifully constructed NumPy, SciPy, and matplotlib libraries for Python. We believe that the time for a Ruby science and visualization package has come. Sometimes when a solution of sugar and water becomes super-saturated, from it precipitates a pure, delicious, and diabetes-inducing crystal of sweetness, induced by no more than the tap of a finger. So is occurring now, we believe, with numeric and visualization libraries for Ruby.”.
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Community Discussions
Trending Discussions on mdarray
QUESTION
I am implementing a container in the form of a multidimensional array. I am trying to replicate std::to_array (C++ 20), a function that creates a std::array from a one dimensional built-in array, using my multidimensional array:
ANSWER
Answered 2021-Apr-08 at 22:11Unfortunately my usual trend of Boost.Mp11 one-liners will come to an end here, since Boost.Mp11 doesn't really deal with values very well and we need to convert int[5][12] into mdarray and there's no easy mechanism to do that with that library.
Instead we just do it by hand. std::extent gives you the Nth extent and std::rank gives you the number of extents. Combine that with make_index_sequence and you can get all of 'em:
QUESTION
I want to store a group of arrays containing 2 numbers in an array. But I only want 2 numbers to be stored when 5 followed by a comma and another number is entered. Essentially, what I want my program to do is read from this array of arrays and perform tasks accordingly. So if the user enters 2, I want to store (2,0) in one space of my array and move on to ask my user for the second number. But if the user types 5,10 I want the program to store (5,10) in that same array. Then my program could filter which array has only one value and which has 2 and do different tasks accordingly. My assignment requires us to not ask 2 numbers for each array which would have made it easier.
This is what I have so far and I know I'm wrong I just don't know where to go from here:
...ANSWER
Answered 2020-Nov-24 at 04:09There were a few issues.
size is one too short (it should be i + 1).
It may be possible to handle 5 vs 5,23 using scanf. But, I prefer to use fgets and strtol and check the delimiter (e.g. whether it's , or not).
The if/else ladder logic can be simplified if we make the first test against input == 9 to stop the loop.
According to your code, you want to force a factor of zero if input != 5. That doesn't make much sense to me, but I've kept that logic [for now].
That may not be what you want/need, but it was my best interpretation of your code. The main purpose is to differentiate how many numbers are on a given line. So, adjust the rest as needed.
I think the way you're storing/displaying the array is incorrect. I believe you want to store input into mdArrays[i][0] and factor into mdArrays[i][1]. Using j makes no sense to me.
As I mentioned [in my top comments], the printf in the final loop is invalid.
Note that the code is cleaner if we don't hardwire the dimensions with a literal 100 in multiple places (e.g. once in the myArrays declaration and again in the outer for loop). Better to use (e.g.) #define MAXCOUNT 100 and replace 100 elsewhere with MAXCOUNT (see below).
I created three versions. One that is annotated with original and fixed code. Another that removes the original code. And, a third that organizes the data using a struct.
Here's the refactored code. I've bracketed your/old code [vs. my/new code] with:
QUESTION
so im just trying to fool around the 2D array, and im curious about one thing
I made a code to return the index of the biggest and smallest number randomed in the 2d array, i tried on *10, and it works perfectly, but when i try to times it 100, the max number works, but the min number isnt working, i keep looking back and forth and just cant find it, here is my code, i actually asked this in the answer section on my last question but it got deleted so i have to ask in a question again, im sorry i just started out a few days ago, and there are so much to ask
for the min number enter image description here
for the max number enter image description here
...ANSWER
Answered 2019-Nov-01 at 07:44It doesn't find min because min is starting at 0, which means it is already lower than any of your random numbers.
Min needs to start at 100, max needs to start at 0.
QUESTION
I am trying to assign numbers randomly. I understand that Math.random() only goes between 0 and 1, and tried to multiply it by 10, and it still does not show any random numbers:
ANSWER
Answered 2019-Oct-31 at 18:17This happens because your cast is wrong. The cast applies only to Math.random() with is less than 1, so it is always casted to 0 and 0*x = 0.
Instead of (int)Math.random()*10 you have to write (int) (Math.random() * 10).
QUESTION
I am stuck in the b,c,d questions of this problem which ask me to set up a matrix of integers (memory alocated) and ask the user what to do: a) Print the matrix. b) Show element ubicated in the position array[i][j]. c) Add all elements of a row selected by the user. d) Add all elements of a column selected by the user. e) Add all elements of the matrix.
I have already tried to implement with a tutorial the row major representation where I used this formula:
address = base Address + (row Index * column Size + column Index)* data Size
So far I figured out how to do the diagonal sum, but I don´t know how to sum the rows and columns with the first address of the array[0][0] that I got with the row major representation.
In the question b). I have not found anything online about how to do it neither.
English is not my mother tongue, If you need something explained better let me know and I will try!
...ANSWER
Answered 2019-Apr-09 at 21:00When implementing loops, it is generally easier to completely decouple loop index (i) and address management (compute @ of array elements), instead of computing address from index at every iteration. It is easier to understand and more efficient (and this how compilers work).
To compute row or col sums, this may correspond to the following code
QUESTION
let's say I have a multidimensional array which for simplicity's sake we'll say just holds numbers:
...ANSWER
Answered 2018-Apr-04 at 10:49How does one access just a specific row?
You can access the row of a 2 dimensional array by returning the element of the first dimension with the index of the desired row number.
Code example:
QUESTION
$arr1 = [1, 2, 3, 8];
$arr2 = [1, 2, 4, 9, 10];
$arr3 = [1, 2, 5, 11, 12];
$arrs = [$arr1, $arr2, $arr3];
arsort($arrs);
ANSWER
Answered 2017-Nov-08 at 12:17You only need rsort if you don't need to keep key
QUESTION
What is the best way to define a new multidimensional array with default key/value pairs?
I think it's best explained by code sample here:
...ANSWER
Answered 2017-Aug-09 at 11:56You can achieve it in two ways.
The first option is use + operator:
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Install mdarray
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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