Simulink: combine real and complex signals

Question

Steven Huang 2012-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/54863-simulink-combine-real-and-complex-signals

I want to combine real and complex signals into a vector (or bus). But neither the Selector nor BusCreator was able to combine these data types into a vector. I would like to know why and if there are blocks to do that before I use real-imag to complex block.

Thanks.

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TAB 2012-12-5

It is possible to combine the Real & Imaginary signal into a Bus Signal using Bus creator.

Can you please describe your case, what & how you are doing your implementation.

Jon 2012-12-5

I was unable to re-create the issue in a small scale model. There appears to be a bug in Simulink's algorithm for resolving signal complexity.

I eventually got my model working by fixing what one of my co-workers described as a 'straight pass through'. In this case, I had unbussed my real and complex signals, and did not modify the real signal before re-bussing. For some reason this messed up Simulink's ability ot parse the signal complexity. To fix this issue, I placed a signal conversion block (set to contiguous copy) on the unmodified line before re-bussing. Problem solved, even though no substantive changes had been made to the model.

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