Matlab Simulink RepMat Execution Time

Dear All,

I need a significant help.

I have a Simulink model that has a subsystem that takes a matris [3x1] and makes it [3x11] by just adding them side by side. Normally we were doing that with vector concatenate and it takes nearly 1 ms. With time optimization processes, we decreased that to 0.95 ms but that is too much for us. We need to decrease that value at least half of 1 ms.

My function is basically a repmat. And it takes nearly 0.95 ms on the hardware.

Since operation is not complex at all, we believe that there should be a less time-consuming way.

Any help will be appreciated.

Thanks.

[Ameer Hamza]

Have you inspected the generated code? That might give some hints on why it is taking too long.

Answer 1

[Walter Roberson]

persistent idx11
if isempty(idx11)
  idx11 = ones(1,11);
end 

y = u(:, idx11) ;