Re: Linear array to matrix

[9il via Digitalmars-d-learn]

On Saturday, 4 April 2020 at 09:25:14 UTC, Giovanni Di Maria 
wrote:
Hi.
Is there a Built-in function (no code, only a built-in function)
that transform a linear array to a Matrix?
For example:

From

[10,20,30,40,50,60,70,80,90,100,110,120];


To

[
[10,20,30],
[40,50,60],
[70,80,90],
[100,110,120]
];

Thank You very much
Cheers.
Giovanni

You may want to look into a mir-algorithm package that supports 
rectangular multidimensional arrays like NumPy.

/+dub.sdl:
dependency "mir-algorithm" version="~>3.7.27"
+/

// http://mir-algorithm.libmir.org/mir_ndslice.html

import mir.ndslice;

void main()
{
    //
    auto intArray = [10,20,30,40,50,60,70,80,90,100,110,120];
    auto intMatrix = intArray.sliced(4, 3);

    static assert(is(typeof(intMatrix) == Slice!(int*, 2)));

    // lazy matrix
    auto lazyMatrix = iota!int([4, 3]/*shape*/, 10/*start*/, 
10/*stride*/);
    assert(intMatrix == lazyMatrix);
    //or
    foreach(i; 0 .. intMatrix.length)
        foreach(j; 0 .. intMatrix.length!1)
                assert(intMatrix[i, j] == lazyMatrix[i, j]);
                
}