How do you multiply one single constant value with a 1D array/matrix containing 25 values in Simulink?

Hi

I am using a constant block which contains an array of 25 elements in the form [0,1,2,3,......]. I also have another signal that contains a single value e.g. 5. I would like to multiply 5 with each of the elements in that array represented by a constant.

When I try to use the simulink product block I get an error saying "Error in port widths or dimensions. Invalid dimension has been specified for input port 1 of 'Combined/Product1'."

How do I get over this error?

Thanks

Answer 1

[Mischa Kim]

James, simply use a Gain block (Commonly Used Blocks) and choose Element-wise multiplication (double-click to open the block). The same should work also with the Product block.

[James Murray]

Sorry 5 was an example. It is not a fixed number and it changes with time and is calculated by doing arithmetic in simulink. Hence gain block would not work.

[James Murray]

I have tried using both Element-wise multiplication and matrix and neither of them worked.

I can expand and clarify the problem to help understand it.

I have a signal that changes with time and it has a constant value. Lets call this in1. I have another constant value called power (defined in matlab) which consists of 25 values in matrix form [0,1,2,3,4,......]

I am trying to solve this problem in Simulink. I would like to Multiply in1 with each of the elements of power and give me a result in 25 elements form. I would than like to add(sum) all these 25 elements to combine it into one constant value. I need to do this for every timestep of the simulation.

[Mischa Kim]

in1 would be the step signal. The constant is a vector with 25 elements.

[James Murray]

Thank you so much for your constant help in my questions. That helped a lot.

Answer 2

[Azzi Abdelmalek]

You can use a product block

[James Murray]

Thanks :)