Element-wise product in Simulink

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Ryan Takatsuka
Ryan Takatsuka 2018-8-22
回答： madhan ravi 2023-12-27
I would like to perform an element-wise multiplication (Hadamard product) between 2 matrices in Simulink. The "multiply" block only allows for element-wise multiplication when the dimensions of both arguments are equal. For example, I would like to perform the following in Simulink (which works in MATLAB):
a = [1,2,3
4,5,6
7,8,9];
b = [1,2,3];
c = a.*b; % element-wise multiplication [3X3] x [1X3]
The only method I have found that works in Simulink is to copy each row of the b vector to produce 2 matrices that have the same dimensions:
a = [1,2,3
4,5,6
7,8,9];
b = [1,2,3
1,2,3
1,2,3];
c = a.*b;
This method is not ideal because my matrices are very large and I am trying to avoid duplicating the b vector to save memory.
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Ryan Takatsuka
Ryan Takatsuka 2018-8-23
So what would be the most efficient way to perform this calculation? It seems like expanding the vector to a matrix internally is inefficient if the vector is very long.
It seems like doing the multiplication manually is the most efficient because the vector doesn't have to be expanded (I was hoping for a cleaner way to do this though since I am trying to accomplish this with pure Simulink blocks and no MATLAB functions):
c = zeros(3);
for i=1:size(a,1)
c(i,:) = a(i,:) .* b;
end
Walter Roberson
Walter Roberson 2018-8-23
I wonder if you could get somewhere switching between sample based and frame based ?
https://www.mathworks.com/help/dsp/ug/sample-and-frame-based-concepts.html

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回答（1 个）

madhan ravi
madhan ravi 2023-12-27
Desired can be achieved using For Each or For Iterator subsystem

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