How can I stop C MEX s-function from outputting anything?

3 vues (au cours des 30 derniers jours)
Sunny Talekar
Sunny Talekar le 28 Juil 2017
I have a C MEX s-function that receives some data, processes it and outputs an array.
I was wondering if there is a way to not output anything (instead of zeros) when the s-function does not receive anything. Inside the s-function I can detect whether anything has been received but I couldn't figure out a way to use this information to inhibit the output (e.g. show nothing when connected to a Display (sink)).
TIA,

Réponse acceptée

Sunny Talekar
Sunny Talekar le 23 Fév 2018
I managed to achieve the desired outcome by configuring the s-function output as variable-size mode and set the current output dimension to 0 when there is nothing to output.

Plus de réponses (1)

Abhi Sundararaman
Abhi Sundararaman le 31 Juil 2017
It shouldn't be possible to remove the output entirely, since if there is an outport on your s-function block, there will always be an output signal.
However, if you want a visual indicator of the output being invalid (basically the same as outputting nothing), you could try outputting "NaN" instead of zeros.
  1 commentaire
Sunny Talekar
Sunny Talekar le 31 Juil 2017
The s-function is designed to output an array of uint8s. I tried setting it to NaN, as suggested, using mxGetNaN(), NAN, std::nan but the output either gets limited to 255 or 0. Not sure, if I'm doing it right.

Connectez-vous pour commenter.

Catégories

En savoir plus sur Block and Blockset Authoring dans Help Center et File Exchange

Tags

Produits

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by