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How can I use Kronecker delta for 3d matrix

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MD MAHABUBUR ROHOMAN
回答： Vinayak Choyyan 2022-10-19
I have a 10x10x10 = s(i,j,l) matrix. Lets say i,j,l rpresent the indices. How would I implement the Kronecker delta for the 3D case like the below 2D case? n=10
2D: delta(sij- s(pbc(i+1,n),j). The idea is if s_i = s_j then delta will give us 1 else 0.
How would I get like that in 3D?
  1 个评论
Torsten
Torsten 2022-10-16
delta(sij- s(pbc(i+1,n),j)
Not clear what this expression (with unbalanced parenthesis) wants to tell us.

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回答（1 个）

Vinayak Choyyan
Vinayak Choyyan 2022-10-19
Hi,
As per my understanding, you would like to create a 10x10x10 matrix with 0 in all locations except when indices i=j=k.
Please try the following code:
a=zeros(10,10,10);
for i = 1:10
a(i,i,i)=1;
end
To know more about zeros function check out this link
Create array of all zeros - MATLAB zeros - MathWorks India
and to know more about for loop in MATLAB please check out this link
for loop to repeat specified number of times - MATLAB for - MathWorks India

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