Scilab Xcos, insert a difference equation in Xcos diagram

Question

How can I insert a difference equation in Xcos diagram, like:

y(k+1) = y(k)[a sqrt(y(k-1))] + b *y(k-1) ;

?

Thanks, Best Regards

EDIT Finding on Internet I think that the best way to address my problem is use: scifunck block.

Answer 1

I would actually do something like that:

where the delay blocks are set to the sample time of your model (I assume we are dealing with discrete signals here) and appropriate initial conditions. Make sure to choose a discrete solver and use the same (appropriate for your problem) sample time for the model and the delay blocks.