How to vary Gain in Simulink dependent on input's amplitude and phase during runtime ?

The Gain block and continuous block in Simulink require the user to specify a gain. This can be a workspace variable. But I want to vary this gain during runtime. I can't seem to get a solution for this. This idea is simple but I can't believe it is so difficult to implement.

I have tried using another block to write to workspace, but found out that the 'to workspace' block only writes to the workspace after the simulation ends or pauses.

I can store the variable in a data memory block, but I don't know how to specify the gain value(s) for the gain/PID block in this case.

[Nikhil N]

Can you provide the scenario where you would require to change the gain value?

[Harsh Kumar]

Let's suppose my gain is 'fun' which depends upon the amplitude(x)of the input signal.

fun = @(x) (cos(x)).^2/(1+2*cos(x)).^3;

And also I've stored the amplitude in a data storage in workspace.

How can I implement this in a Gain block in simulink?

Answer 1

[Fangjun Jiang]

Use the Product block. The Gain block is an operation of multiplication, right?

[Harsh Kumar]

Yes thanks... I'll try it out.