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Is there any way of creating a 3D matrix randomly? There are ways to create random 2D matrices using randint function. Is there any inbuilt function like that?
E.g. a 4x4 matrix can be generated easily by using the randint function. What if I want to create a matrix of dimension 4x4x3?
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A 3D matrix is nothing but a collection (or a stack) of many 2D matrices, just like how a 2D matrix is a collection/stack of many 1D vectors. So, matrix multiplication of 3D matrices involves multiple multiplications of 2D matrices, which eventually boils down to a dot product between their row/column vectors.
You can use the randperm function to create a double array of random integer values that have no repeated values. For example, r4 = randperm(15,5);
To create a three-dimensional array, we pass the object representing x by y by z in python, where x is the nested lists in the object, y is the nested lists inside the x nested lists, and z is the values inside each y nested list. The newly created three-dimensional array is stored in the variable called threedimarray.
Code for Picking a Random Array Value The code for picking a random value from an array looks as follows: let randomValue = myArray[Math. floor(Math. random() * myArray.
You can use randi(imax, size1, size2, size3) function where imax refers to maximum of random integer values (mean upper bound) and 1 is lower bound. You can expand size argument to sizeN what you want.
This is an example of its usage:
>> A = randi(5, 4, 4, 3)
A(:,:,1) =
4 4 5 4
4 1 2 2
2 1 3 3
4 3 2 4
A(:,:,2) =
5 1 5 1
5 2 2 2
3 5 5 4
1 2 2 3
A(:,:,3) =
2 5 2 3
5 2 3 4
3 4 1 5
3 4 1 1
If you read the help carefully, you will notice that the randi function accepts any number of dimensions. You may do randi(10,3,3,3)
randi(10,3,3,3)
ans(:,:,1) =
9 10 3
10 7 6
2 1 10
ans(:,:,2) =
10 10 2
2 5 5
10 9 10
ans(:,:,3) =
8 1 7
10 9 8
7 10 8
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