MATLAB: Difference between ssGetInputPortRealSignal and ssGetInput​PortRealSi​gnalPtrs

Question

Hi there,

I coded a S-Function which works pretty good. This function has several inputports with one dimension and several moredimensional inputports. At the moment I'm using the macro ssGetInputPortRealSignalPtrs(S,i)[j] to get the value of an input. But today someone told me using the macro ssGetInputPortRealSignal(S,i) might be a better way to get the value of this signal because this has a higher performace.

Can somebody explain the main differences between those to macros and which one should be used? I only know so far that ssGetInputPortRealSignals requires time continuous signals which can be initialzed with the macro ssSetInputPortRequiredContiguous.

Thanks for your support in advance, CN

Answer 1

You are correct that "ssGetInputPortRealSignals requires time contiguous signals which can be initialzed with the macro ssSetInputPortRequiredContiguous."

ssGetInputPortRealSignalPtrs is used for signals that can be non-contiguous. Examples of a non-contiguous signal are a bus signal or a signal that is a result of MUX-ing together signals from multiple sources, and possible other types of composite signals (I'm not sure if all composite signals are non-contiguous).